FILED PURSUANT TO RULE 424B2

This prospectus supplement and the related prospectus relate to an effective registration statement under the Securities Act of 1933, as amended, but are not complete and may be changed. This prospectus supplement and the accompanying prospectus are not an offer to sell these securities and we are not soliciting an offer to buy these securities in any jurisdiction where the offer or sale is not permitted.

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The shares of our common stock offered hereby are shares that we will loan to Deutsche Bank Securities Inc., as agent for Deutsche Bank AG (London), an affiliate of Deutsche Bank AG, as principal, pursuant to a share lending agreement.

Under the share lending agreement, we will receive a loan fee of $.001 for each share that we lend. We have been advised by Deutsche Bank that it intends to use the proceeds from the sale of the shares to facilitate transactions by which investors in our contingent convertible notes due 2014 being offered in a concurrent offering will hedge their investments in the convertible notes through short sales or privately negotiated derivatives transactions. See “Concurrent Offering of Convertible Notes” and “Underwriting” on pages S-41 and S-47, respectively, of this prospectus supplement. We will not receive any of the proceeds from the sale of the shares of common stock in this offering.

Our common stock is listed on The New York Stock Exchange under the trading symbol “CPN.” On September 20, 2004, the last sale price reported on The New York Stock Exchange for our common stock was $3.61.

Investing in our common stock involves risks. See “Risk Factors” on page S-21 of this prospectus supplement and page 8 of the accompanying prospectus about factors you should consider before purchasing our common stock.

Delivery of the shares of common stock will be made on or about September l , 2004.

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or determined if this prospectus supplement or the prospectus to which it relates is truthful or complete. Any representation to the contrary is a criminal offense.

You should rely only on the information contained in this prospectus supplement, the prospectus to which it relates or to which we have referred you. We have not authorized anyone to provide you with information that is different. This document may only be used where it is legal to sell these securities. The information in this prospectus supplement may only be accurate on the date of this prospectus supplement.

This document is in two parts. The first is this prospectus supplement, which describes the specific terms of the common stock being offered by us. The second part, the accompanying prospectus, gives more general information, some of which may not apply to this offering.

If the description of the offering varies between this prospectus supplement and the accompanying prospectus, you should rely on the information in this prospectus supplement.

Unless we have indicated otherwise, references in this prospectus supplement or the accompanying prospectus to “Calpine,” “the Company,” “we,” “us” and “our” or similar terms are to Calpine Corporation and its consolidated subsidiaries, excluding Calpine Capital Trust V, Calpine Capital Trust IV, Calpine Capital Trust III, Calpine Capital Trust II and Calpine Capital Trust. Unless we have indicated otherwise, references hereafter in this prospectus supplement or the accompanying prospectus to “$” or “dollar” are to the lawful currency of the United States.

Some of the statements contained or incorporated by reference in this prospectus supplement and the prospectus to which it relates are forward-looking statements within the meaning of Section 27A of the Securities Act and Section 21E of the Securities Exchange Act and are subject to the safe harbor created by the Private Securities Litigation Reform Act of 1995. These statements include declarations regarding our or our management’s intents, beliefs or current expectations. In some cases, you can identify forward-looking statements by terminology such as “may,” “will,” “should,” “expects,” “plans,” “anticipates,” “believes,” “estimates,” “predicts,” “potential,” or “continue” or the negative of these terms or other comparable terminology. Any forward-looking statements are not guarantees of future performance and actual results could differ materially from those indicated by the forward-looking statements. Forward-looking statements involve known and unknown risks, uncertainties, and other factors that may cause our or our industry’s actual results, levels of activity, performance, or achievements to be materially different from any future results, levels of activity, performance, or achievements expressed or implied by such forward-looking statements.

Among the important factors that could cause actual results to differ materially from those indicated by such forward-looking statements are the following:


	•	the timing and extent of deregulation of energy markets and the rules and regulations adopted on a transitional basis with respect thereto;

	•	the timing and extent of changes in commodity prices for energy, particularly natural gas and electricity and the impact of related derivatives transactions;

	•	supply of and demand for power in the markets served by our power generation facilities, including the potential effects of unseasonable weather patterns that result in reduced demand for power and unscheduled outages of our power generation facilities;

	•	economic slowdowns, which can adversely affect consumption of power by businesses and consumers;

	•	the inability to commence commercial operation of new facilities, whether as a result of failure to obtain the necessary permits to operate, failure of third-party contractors to perform their contractual obligations, inability to obtain project financing on acceptable terms or otherwise;

	•	our ability to accurately estimate future costs;


	•	development of lower-cost power plants or of a lower-cost means of operating a fleet of power plants by our competitors;

	•	our ability to market and sell power from power plants in the evolving energy market;

	•	the successful exploitation of an oil or gas resource that ultimately depends upon the geology of the resource, the total amount and costs to develop recoverable reserves, and legal title, regulatory, gas administration, marketing and operational factors relating to the extraction of natural gas;

	•	our ability to accurately estimate oil and gas reserves;

	•	reduced liquidity in the trading and power industry;

	•	our ability to access the capital markets on attractive terms or at all;

	•	our ability to accurately estimate sources and uses of cash, which estimates are based on current expectations;

	•	the direct or indirect effects on our business of a lowering of our credit rating (or actions we may take in response to changing credit rating criteria), including increased collateral requirements, refusal by our current or potential counterparties to enter into transactions with us and our inability to obtain credit or capital in desired amounts or on favorable terms;

	•	possible future claims, litigation and enforcement actions pertaining to the foregoing;

	•	effects of the application of regulations, including changes in regulations or the interpretation thereof;

	•	other risks identified in this prospectus supplement or the prospectus to which it relates; and

	•	other risks identified from time to time in our reports and registration statements filed with the SEC, including the risk factors identified in our Annual Report on Form 10-K/A for the year ended December 31, 2003, which is incorporated by reference in this prospectus supplement and the prospectus to which it relates.

Although we believe that the expectations reflected in the forward-looking statements are reasonable, we cannot guarantee future results, levels of activity, performance or achievements.

This summary highlights material information regarding this offering. This summary may not contain all the information that may be important to you. You should read the entire prospectus and prospectus supplement, including the risk factors, financial data and related notes, and the documents incorporated by reference herein, before making an investment decision. Unless the context otherwise indicates, references in this prospectus supplement to our “Annual Report on Form 10-K/ A for the year ended December 31, 2003” means our Amendment No. 2 to the Annual Report on Form 10-K for the year ended December 31, 2003, filed on Form 10-K/A on September 22, 2004. You should pay special attention to the “Risk Factors” section beginning on page S-21 of this prospectus supplement to determine whether an investment in our common stock is appropriate for you.

We are a San Jose, California based power company engaged in the development, construction, ownership and operation of power generation facilities and the sale of electricity, predominantly in the United States, but also in Canada, Mexico and the United Kingdom. We were established as a corporation in 1984. We focus on two efficient and clean types of power generation technologies: natural gas-fired combustion turbine and geothermal. We currently lease and operate a significant fleet of geothermal power plants at The Geysers, and have increased our operating portfolio of clean burning natural gas power plants by 17,502 megawatts, or MW, over the past three years.

Power Plants. Currently, we own interests in 91 power plants having a net capacity of 26,206 MW. We also have 12 gas-fired projects currently under construction having a net capacity of 5,751 MW. The completion of these new projects would give us interests in 103 power plants located in 23 states, three Canadian provinces, Mexico and the United Kingdom, having a net capacity of 31,957 MW. Of this total generating capacity, 98% will be attributable to gas-fired facilities and 2% will be attributable to geothermal facilities.

Natural Gas Assets. We have in place an experienced gas production management team that manages the nearly 472 billion cubic feet equivalent, or Bcfe, of proved gas reserves we own (calculated based on reserves as of December 31, 2003, as adjusted to reflect the recent sales of certain of our gas reserves). Our reserves are located primarily in California, South Texas and Gulf Coast regions, all of which are major oil and gas producing regions in North America. Approximately 96% of our North American proved reserves are natural gas. In addition to our ability to produce over 120 million cubic feet equivalent, or MMcfe, of natural gas per day, we own or control approximately 118,000 net undeveloped acres (calculated as of December 31, 2003, with adjustments to reflect the recent sales of certain of our gas reserves and recent acreage expirations) that are available for future exploration or drilling activity. For more information about the recent sales of certain of our gas reserves, see “—Recent Developments—Sale of Certain Natural Gas Reserves and Petroleum Assets; Repayment and Reduction of Commitments Under Senior Secured Credit Facility.”

Calpine Energy Services L.P. Our wholly-owned subsidiary, Calpine Energy Services L.P., or CES, provides the trading and risk management services needed to schedule our power sales and to best assure that fuel is delivered to our power plants on time to meet delivery requirements and to optimize the value of our power and gas assets.

Complementing CES’s activities, we have recently reorganized our sales and marketing organization to better meet the needs of our growing list of wholesale and large retail electric customers. We focus our sales activities on load serving entities such as local utilities, municipalities and cooperatives, as well as on large-scale end-users, such as industrial and

Power Contract Portfolio. As of June 30, 2004, our contractual portfolio consisted of 152 contracts covering 105 customers with a weighted average investment grade credit rating. The weighted average life of the contracts in the portfolio is approximately seven years. As of June 30, 2004, we had approximately 46% of our estimated generation capacity sold for 2005.

We also continue to strengthen our system operations management and information technology capabilities to enhance the economic performance of our portfolio of assets in our major markets and to provide load-following and other ancillary services to our customers. These operational optimization systems, combined with our sales, marketing and risk management capabilities, enable us to add value to traditional commodity products in a way that not all competitors can match.

Our construction organization has assembled an experienced team of construction management professionals to ensure that our projects are built using our standard design specifications reflecting our exacting operational standards. We have established relationships with leading equipment manufacturers for gas turbine generators, steam turbine generators, heat recovery steam generators and other key equipment. We will continue to leverage these capabilities and relationships to assure that our power plants are completed on time and are the best built and lowest cost energy facilities possible.

With a vision of enhancing the performance of our modern portfolio of gas-fired power plants and lowering our replacement parts maintenance costs, we have fostered the development of our wholly owned subsidiary, Power Systems Manufacturing, to design and manufacture high performance combustion system and turbine blade parts. Power Systems Manufacturing also provides high quality turbine replacement parts to the industry. It offers a wide range of low emissions combustion systems and advanced airfoils designed to be transparently compatible for retrofitting or replacing existing combustion systems or components operating in General Electric and Siemens Westinghouse turbines.

In 2003, we expanded our energy services capabilities with the acquisition of Netherlands-based Thomassen Turbine Systems. Thomassen Turbine Systems complements Calpine’s broad array of energy services by selling combustion turbine component parts and repair services worldwide.

We established Calpine Power Services to offer the unique skills that we have developed in building and operating our own power plants to third party customers. We are now selling, and have received contracts for, various engineering, procurement, construction management, plant commissioning, operations, and maintenance services through Calpine Power Services.

and others. The power industry has become generally deregulated at the wholesale level allowing generators to sell directly to the load-serving entities, such as public utilities, municipalities and electric cooperatives. Although industry trends and regulatory initiatives aimed at further deregulation have slowed, the power industry continues to transform into a more competitive market.

The North American Electric Reliability Council estimates that in the United States, peak (summer) electric demand in 2003 totaled approximately 720,000 MW, while summer generating capacity in 2003 totaled approximately 912,000 MW, creating a peak summer reserve margin of 192,000 MW, or 26.7%. Historically, utility reserve margins have been targeted to be 15% above peak demand to provide for load forecasting errors, scheduled and unscheduled plant outages and local area grid protection. The United States market consists of regional electric markets not all of which are effectively interconnected, so reserve margins vary from region to region. Some regions have margins well in excess of the 15% target range, while other regions remain short of ideal reserve margins. The estimated 192,000 MW of reserve margin in 2003 compares to an estimated 120,000 MW in 2002. The increase is due in large part to the start-up of new low-cost, clean-burning, gas-fired power plants.

Even though most new power plants are fueled by natural gas, the majority of power generated in the U.S. is still produced by coal and nuclear power plants. The Energy Information Administration has estimated that approximately 51% of the electricity currently generated in the U.S. is fueled by coal, 20% by nuclear sources, 17% by natural gas, 7% by hydro, and 5% from fuel oil and other sources. As regulations continue to evolve, many of the current coal plants will likely be faced with installing a significant amount of costly emission control devices. This activity could cause some of the oldest and dirtiest coal plants to be retired, thereby allowing a greater proportion of power to be produced by cleaner natural gas-fired generation.

Due primarily to the completion of gas-fired combustion turbine projects, we have seen increased power supplies and higher reserve margins in the last two years accompanied by a decrease in liquidity in the energy trading markets and a general lessening of enthusiasm for investing in energy companies. In 2003, while electricity prices generally increased, the cost of natural gas grew at an even greater rate, further depressing spark spreads (the margin between the value of the electricity sold and the cost of fuel to generate that electricity) from the low levels in 2002.

Based on strength in residential and commercial demand, overall national consumption of electricity for the period from January 1, 2004 through September 4, 2004 is estimated to have been approximately 1.38% higher than it was for the same period in 2003, according to Edison Electric Institute published data. The growth rate for calendar year 2003 was 1.8%. The growth rate in supply is diminishing with many developers canceling or delaying completion of their projects as a result of current market conditions. The supply and demand balance in the natural gas industry continues to be strained with gas prices rising to over $6.40 per million British thermal units, or MMbtu, in the first half of 2004, compared to an average of approximately $5.50 per MMbtu in 2003 and $3.00 per MMbtu in 2002. Overall, we expect the market to continue to work through the current oversupply of power in several regions within the next few years. As the supply-demand dynamics improve, we expect to see spark spreads improve.

Our vision is to become North America’s largest and most profitable power company and ultimately become a major worldwide power company. In achieving our corporate strategic objectives, the number one priority for our company is maintaining the highest level of integrity in all of our endeavors.

Our timeline to achieve our strategic objectives is flexible and will be guided by our view of market fundamentals. When necessary, we will slow or delay our growth activities in order to assure that our financial health is secure and our investment opportunities meet our long-term rate of return requirements.

Our ability to adapt as needed to market dynamics has led us to develop a set of near-term strategic objectives that continue to guide our activities until market fundamentals improve. These include:


	•	Continue to focus on our liquidity position as our second highest priority after integrity;

	•	Complete our 2004 refinancing program, which includes refinancing the Remarketable Term Income Deferrable Equity Securities, or HIGH TIDES, including the redemption of our HIGH TIDES I and HIGH TIDES II with the proceeds of our concurrent offering of convertible notes (see “Concurrent Offering of Convertible Notes”);

	•	Complete our current construction program and start construction of new projects in strategic locations only when financing is available and attractive returns are expected;

	•	Continue to lower operating and overhead costs per megawatt hour produced and improve operating performance with an increasingly efficient power plant fleet; and

	•	Utilize our marketing and sales capabilities to selectively increase our power contract portfolio.

We plan on realizing our strategy by (i) achieving the low-cost position in the industry by applying our fully integrated areas of expertise to the cost-effective development, construction, financing, fueling and operation of efficient power generation facilities and by achieving economies of scale in general and administrative and other support costs, and (ii) enhancing the value of the power we generate in the marketplace (a) by operating our plants as a system, (b) by selling directly to load-serving entities and, to the extent allowable, to industrial customers, in each of the markets in which we participate, (c) by offering load-following and other ancillary services to our customers, and (d) by providing effective marketing, risk management and asset optimization activities through CES and marketing and sales organizations.

Our “system approach” refers to our ability to cluster our standardized, efficient power generation assets within a given energy market and sell the energy from that system of power plants, rather than using “unit specific” marketing contracts. The clustering of standardized power generation assets allows for significant economies of scale to be achieved. Specifically, construction costs, supply chain activities such as inventory and warehousing costs, labor and fuel procurement costs can all be reduced with this approach. The choice to focus on highly efficient and clean technologies reduces our fuel costs, a major expense when operating power plants. Furthermore, our lower-than-market heat rate (high efficiency advantage) provides us with a competitive advantage, particularly in times of rising fuel prices. Finally, utilizing our system approach in a sales contract means that we can provide power to a customer from whichever plant in the system is most economical at a given period of time. In addition, the operation of plants can be coordinated when increasing or decreasing power output throughout the day to enhance overall system efficiency, thereby enhancing the heat rate advantage already enjoyed by the plants. In total, this approach lays a foundation for a sustainable competitive cost advantage in operating our plants.

The integration of gas production, trading, and marketing activities achieves additional cost reductions while simultaneously enhancing revenues. Our fleet of natural gas burning power plants requires a large amount of gas to operate. Our fuel strategy is to produce a portion of our fuel generation requirements from our own gas reserves to provide a natural hedge against gas price volatility, while providing a secure and reliable source of fuel and lowering our fuel costs over time. The ownership of gas provides our CES risk management organization with additional flexibility when structuring fixed price transactions with our customers.

Recent trends confirm that both buyers and sellers of power benefit from signing long-term power contracts and avoiding the severe volatility often seen with power prices. The trend toward signing long-term contracts is creating opportunities for companies, such as ours, that own power plants and gas reserves to negotiate directly with buyers (end users and load serving entities) that need power, thereby bypassing the trading middlemen, many of whom are now exiting the market.

Our marketing and sales organization is dedicated to serving wholesale and industrial customers with reliable, cost-effective electricity and a full range of services. The organization offers customers: (i) wholesale bulk energy; (ii) firm supply energy; (iii) fully dispatchable energy; (iv) full service requirements energy; (v) renewable energy; (vi) energy scheduling services; (vii) engineering, construction, operations and maintenance services; and (viii) critical reliability energy services. Our physical, financial and intellectual assets and our generating facilities that are pooled into unique energy centers in key markets, enable us to create customizable energy solutions for our customers. For example, our wholesale energy products deliver power when, where and in the capacity our customers need. Our power marketing experience gives us the know-how to structure innovative deals that meet our customers’ particular requirements. Our highly tailored, yet understandable energy contracts help customers offset pricing risk and other variables. Our “Virtual Power Plant” projects provide customers with an energy resource that is reliable and flexible. They give customers all of the advantages of owning and operating their own plants without many of the risks, by gaining access to a portfolio of highly efficient generation assets and by implementing our IT solutions to allow power to be dispatched as needed. Our marketing and sales organization is currently pursuing 21,000 MW of active opportunities with 135 customers across the United States. This customer base includes municipalities, cooperatives, investor owned utilities, industrial customers and commercial customers across the United States.

Our financing strategy includes an objective to achieve and maintain an investment grade credit and senior bond rating from the major rating agencies within the next several years. We intend to employ various approaches for extending or refinancing existing credit facilities and for financing new plants, with a goal of retaining maximum system operating flexibility. The availability of capital at attractive terms will be a key requirement to enable us to develop and construct new plants. We have successfully adjusted to recent market conditions by taking near-term actions focused on liquidity. We have been very successful throughout 2003 and 2004 at selling certain less strategically important assets, monetizing several contracts, issuing convertible and non-convertible senior notes, buying back our debt and raising capital with non-recourse project financing.

Offering of Contingent Convertible Notes. Concurrently with this offering of common stock, we are offering $600 million aggregate principal amount at maturity ($690 million aggregate principal amount at maturity if Deutsche Bank Securities Inc., which we refer to herein as DB, the underwriter of that offering and of the common stock hereby, exercises in full its overallotment option) of Contingent Convertible Notes due 2014, which we refer to as the “convertible notes,” by means of a separate prospectus supplement in an offering registered

Offering of $785 Million of First Priority Senior Secured Notes. Concurrently with this offering of common stock, we are offering $785 million in aggregate principal amount of our l % first priority senior secured notes due 2014, which we refer to as the “senior secured notes,” in a transaction exempt from registration under Rule 144A of the Securities Act. The senior secured notes will be secured by first priority liens on all of the assets now owned or hereafter acquired directly by Calpine Corporation, except for assets that are specifically excluded from the collateral, and by pledges by Calpine Corporation of the equity of its direct, wholly-owned subsidiaries, except for certain excluded subsidiaries. Additionally, the senior secured notes will be guaranteed on a limited basis by Quintana Canada Holdings, LLC, one of our U.S. subsidiaries. We intend to use the proceeds from the offering of the senior secured notes for general corporate purposes, which may include the retirement of certain of our outstanding debt securities and the financing of exploration, drilling, development, construction or purchase of, or repairs, improvements or additions to, certain of our property or assets. The senior secured notes will be offered in the United States in a private placement transaction under Rule 144A of the Securities Act. The senior secured notes have not been registered under the Securities Act, and may not be offered in the United States absent registration or an applicable exemption from registration requirements.

Repurchase of 4.75% Contingent Convertible Notes due 2023. We have agreed to repurchase from DB or an affiliate of DB $266 million in aggregate principal amount of our 4.75% Contingent Convertible Senior Notes due 2023, at a price equal to approximately $220 million (which price is subject to change based on market conditions at the time of purchase).

In addition to the recent developments described below, please see the recent developments described in our Quarterly Report on Form 10-Q for the quarter ended June 30, 2004, which is incorporated by reference in this prospectus supplement.

Amendments to Annual Report for Year Ended December 31, 2003 and Quarterly Report for Quarter Ended March 31, 2004. We amended our Annual Report on Form 10-K for the year ended December 31, 2003 on September 13, 2004 and again on September 22, 2004. References in this prospectus supplement to our Annual Report on Form 10-K/ A for the year ended December 31, 2003 means our Amendment No. 2 to the Annual Report on Form 10-K, filed on Form 10-K/A on September 22, 2004. We also amended our Quarterly Report on Form 10-Q for the quarter ended March 31, 2004 on September 13, 2004. The amendments were made in connection with the SEC’s review of our registration statement on Form S-3, relating to the resale of our 4.75% Contingent Convertible Notes, and certain of our filings incorporated by reference in that registration statement. Our consolidated financial statements did not change as a result of the amendments related to the SEC’s review but certain of the disclosure included in the amended reports was revised or expanded. Unrelated to the SEC’s review, the amendments also made certain reclassifications to our consolidated balance sheets. See “Reclassifications” in Note 2 of the Notes to Consolidated Financial Statements included in our Annual Report on Form 10-K/A for the year ended December 31, 2003 and Note 2 of the Notes to Consolidated Condensed Financial Statements included in our Quarterly Report on Form 10-Q/A for the quarter ended March 31, 2004, each of which is incorporated by reference herein. For more information about the amendments generally, see “Explanatory Note” in our Annual Report on Form 10-K/A for the year ended December 31, 2003 and our Quarterly Report on Form 10-Q/A for the quarter ended March 31, 2004.

$360 Million Preferred Equity Offering. On September 17, 2004, we announced that Calpine (Jersey) Limited, a new company being formed as our indirect, wholly owned

subsidiary, intends to commence an offering of $360 million of two-year Redeemable Preferred Shares in a private placement transaction under Regulation D and Regulation S of the Securities Act. The offering is subject to the receipt of certain regulatory approvals. We intend to initially loan the proceeds of the offering to our 1,200 MW Saltend cogeneration power plant located in Hull, Yorkshire, England, and the payments of principal and interest on the loan will fund payments on the Redeemable Preferred Shares. The net proceeds of the offering will ultimately be used as permitted by the terms of our outstanding debt securities. The redeemable preferred shares will be offered in the United States in a private placement transaction under Regulation D of the Securities Act and outside of the United States under Regulation S of the Securities Act. The redeemable preferred shares have not been registered under the Securities Act, and may not be offered in the United States absent registration or an applicable exemption from registration requirements.

Sale of Certain Natural Gas Reserves and Petroleum Assets; Repayment and Reduction of Commitments Under Senior Secured Credit Facility. On September 1, 2004, we completed the sale of all of our right, title and interest in our oil and gas properties and associated assets in New Mexico and Colorado (except for the Kitzmiller property of Calpine Natural Gas L.P. located in the northwest part of Colorado, which was retained), including our leases, minerals, overrides, easements, wells, contracts, and personal property. These New Mexico and Colorado properties were sold, effective July 1, 2004, for approximately $140 million and approximately $83 million, respectively, subject, in each case, to certain post-closing adjustments, including for certain title defects claimed by the purchaser. Such properties and assets represent approximately 120 Bcfe of proved reserves, producing approximately 16.3 MMcfe of net gas per day.

On September 2, 2004, we completed the sale, effective as of July 1, 2004, of all of our Canadian natural gas reserves and petroleum assets, together with certain units of the Calpine Natural Gas Trust, for a total purchase price of approximately $625 million, less adjustments to reflect the September 2, 2004 closing date. (The purchase price takes into account a foreign exchange hedge established in connection with this transaction). As of September 2, 2004, these assets represented approximately 221 Bcfe of proved reserves, producing approximately 61 MMcfe of net gas per day. Also included in this sale was our 25% interest in approximately 80 Bcfe of proved reserves (net of royalties) and 32 net MMcfe per day of production owned by the Calpine Natural Gas Trust. Following the closing of the sale of our oil and gas assets in Canada, $225.0 million of the net cash proceeds was repatriated to the United States. This dividend triggered an additional U.S. tax provision of approximately $90.0 million, which will be recorded by Calpine in the third quarter of 2004. Additionally, as a result of the sale of the Canadian oil and gas assets, we expect that Calpine’s effective tax rate will be negatively impacted in 2004 and future periods due to the inability to realize certain tax benefits.

All of the proceeds from the U.S. gas asset sales and a portion of the proceeds from the Canadian gas sales were used to repay all amounts outstanding under our existing senior secured credit facility and to terminate the revolving commitments thereunder. A portion of the proceeds from the Canadian gas asset sale was also used to cash collateralize the $144.8 million of letters of credit outstanding under that agreement. Remaining proceeds from the Canadian gas asset sale will be used in accordance with the asset sale provisions of our existing bond indentures. Following the repayment of our existing secured credit facility, we expect to issue new secured first priority lien debt that will rank senior to our other outstanding secured debt. See “Concurrent Transactions—Offering of $785 Million of First Priority Senior Secured Notes” above.

Letter of Credit Facility of Calpine Energy Management L.P. On August 5, 2004, our indirect wholly owned subsidiary, Calpine Energy Management L.P., entered into a $250.0 million letter of credit facility with Deutsche Bank (rated Aa3/ AA-) that expires in October 2005. Deutsche Bank will guarantee Calpine Energy Management L.P.’s power and gas

obligations by issuing letters of credit under the facility. Receivables generated through power sales will serve as collateral to support the letters of credit. Calpine Energy Management L.P. was created to facilitate short-term gas and power purchases and sales transactions ranging from the hourly market up to one month forward.

Refinancing of Rocky Mountain and Riverside. On June 29, 2004, our indirect wholly owned subsidiaries, Rocky Mountain Energy Center, LLC and Riverside Energy Center, LLC, issued $633.4 million of First Priority Secured Floating Rate Term Loans due 2011 and entered into a $28.1 million letter of credit-linked deposit facility. Net proceeds from the loans, after transaction fees and expenses, were used to refinance amounts outstanding under the $250.0 million non-recourse project financing for our Rocky Mountain facility and the $230.0 million non-recourse project financing for our Riverside facility, and to pay final construction costs for those facilities. In connection with this refinancing, we wrote off $13.2 million in deferred financing costs. In addition, approximately $160.0 million was used to reimburse Calpine for costs incurred in connection with the development and construction of the Rocky Mountain and Riverside facilities. We also received approximately $79.0 million in proceeds via a combination of cash and increased credit capacity as a result of the elimination of certain reserves and cancellation of letters of credit associated with the original non-recourse project financings.

Financing by Power Contract Financing III, LLC. On June 2, 2004, our indirect wholly owned subsidiary, Power Contract Financing III, LLC, issued $85.0 million aggregate amount at maturity of zero coupon notes collateralized by its ownership interest in Power Contract Financing, L.L.C. Power Contract Financing III, LLC owns all of the equity interests in Power Contract Financing, L.L.C., which holds the California Department of Water Resources I contract that was monetized in June 2003 and maintains a debt reserve fund. We received cash proceeds of approximately $50.0 million from the issuance of the zero coupon notes.

Repurchases of Outstanding Debt. In transactions initiated from January 1, 2004 through September 17, 2004, we repurchased $222.3 million of the principal amount of our outstanding debt and the HIGH TIDES preferred securities as listed below:


	•	$38.9 million of 8 1/4% Senior Notes due 2005;

	•	$11.0 million of 7 3/4% Senior Notes due 2009;

	•	$40.7 million of 8 1/2% Senior Notes due 2008;

	•	$9.0 million of 8 1/2% Senior Notes due 2011;

	•	$7.7 million of 10 1/2% Senior Notes due 2006;

	•	$40.0 million of 5 3/4% HIGH TIDES I; and

	•	$75.0 million of 5 1/2% HIGH TIDES II.

The securities were repurchased in exchange for approximately $83.8 million in cash and approximately 24.3 million shares of our common stock valued at approximately $112.5 million.

Restructuring and Sale of Power Contracts with Jersey Central Power & Light Company. On May 26, 2004, the existing toll arrangements between Jersey Central Power & Light Company and our Newark and Parlin power plants were terminated. In connection with this termination, Utility Contract Funding II, LLC, a wholly-owned subsidiary of CES, entered into a long-term power purchase agreement with Jersey Central Power & Light Company and was then sold. A portion of the proceeds from these transactions was used to retire project financing debt of $78.8 million. The aggregate pre-tax gain, net of transaction costs and the write-off of unamortized deferred financing costs, was $171.5 million.

Refinancing of Calpine Generating Company, LLC. On March 23, 2004, our wholly-owned subsidiary, Calpine Generating Company, LLC, which was formerly Calpine Construction Finance Company II, LLC, which we refer to as CalGen or CCFC II, completed its offering of senior secured term loans and notes. The term loans and notes are secured through a combination of pledges of the equity interests in CalGen and its first tier subsidiary, CalGen Expansion Company, by the assets of CCFC II’s power generating facilities (other than its Goldendale facility) and related assets located throughout the United States. The lenders’ recourse is limited to such security, and none of the indebtedness is guaranteed by Calpine.

We realized net proceeds from the offerings (after payment of transaction fees and expenses, including the fee payable to Morgan Stanley in connection with an index hedge) in the approximate amount of $2.3 billion. Net proceeds from the offerings were used to refinance amounts outstanding under CCFC II’s $2.5 billion revolving construction credit facility, which was scheduled to mature in November 2004, and to pay transaction fees and expenses associated with the refinancing. Concurrent with the refinancing, CCFC II amended and restated its credit facility to reduce the commitments under the facility to $200.0 million and extend its maturity to March 2007. Outstanding indebtedness and letters of credit under the credit facility totaled approximately $2.4 billion at the refinancing date.

Merger of Quintana Minerals (USA), Inc. and JOQ Canada, Inc. into Quintana Canada Holdings, LLC. On September 3, 2004, two of our U.S. subsidiaries, Quintana Minerals (USA), Inc. and JOQ Canada, Inc., each a Delaware corporation, merged into one of our other U.S. subsidiaries, Quintana Canada Holdings, LLC, a Delaware limited liability company. Before the merger, all three of the subsidiaries guaranteed our second priority notes and term loans on a limited basis. Quintana Canada Holdings, LLC will continue to guarantee our second priority notes and term loans on a limited basis.

$360 Million Preferred Equity Offering. On September 17, 2004, we announced that Calpine (Jersey) Limited, a new company being formed as our indirect, wholly owned subsidiary, intends to commence an offering of $360 million of two-year redeemable preferred shares. The offering is subject to the receipt of certain regulatory approvals. We intend to initially loan the proceeds of the offering to our 1,200 MW Saltend cogeneration power plant located in Hull, Yorkshire, England, and the payments of principal and interest on the loan will fund payments on the redeemable preferred shares. The net proceeds of the offering will ultimately be used as permitted by the terms of our outstanding debt securities. The redeemable preferred shares will be offered in the United States in a private placement transaction under Regulation D of the Securities Act and outside of the United States under Regulation S of the Securities Act. The redeemable preferred shares have not been registered under the Securities Act, and may not be offered in the United States absent registration or an applicable exemption from registration requirements.

On August 9, 2004, the Company filed its Quarterly Report on Form 10-Q for the quarter ended June 30, 2004, which is incorporated by reference in this prospectus supplement. As disclosed therein, Calpine recorded a net loss of approximately $28.7 million for the quarter ended June 30, 2004, compared to the net loss of approximately $23.4 million recorded for the quarter ended June 30, 2003. Total revenue for the quarter increased to approximately $2.31 billion from approximately $2.17 billion for the quarter ended June 30, 2003. The increase in total revenue was attributable to an increase in electricity and steam revenue due to the completion, operation and expansion of new plants and facilities, and in sales of purchased gas for hedging and optimization due to higher volumes and higher prices of natural gas as compared to the same period in 2003.

For the quarter ended June 30, 2004, gross profit decreased by $107.9 million, or 61%, to $67.7 million for the quarter ended June 30, 2004. The gross profit decrease is the result of lower per megawatt-hour spark spreads realized during the three months ended June 30, 2004, and additional costs associated with new power plants coming on line. For the three months ended June 30, 2004, Calpine generated 22.1 million megawatt-hours, which equated to a baseload capacity factor of 47%, and realized an average spark spread of $21.91 per megawatt-hour. We calculate our average spark spread by subtracting our adjusted fuel expense (including our equity gas benefit) from adjusted electricity and steam revenue and dividing the difference by total generated megawatt-hours in the applicable period. For further information regarding how we calculate our average spark spread, see “Management’s Discussion and Analysis of Financial Condition and Results of Operations — Performance Metrics,” in our Quarterly Report on Form 10-Q for the quarter ended June 30, 2004, which is incorporated by reference herein. For the same period in 2003, Calpine generated 17.5 million megawatt-hours, which equated to a capacity factor of 48%, and realized an average spark spread of $26.93 per megawatt-hour.

In the quarter ended June 30, 2004, the company netted approximately $322 million from sales of purchased power for hedging and optimization with purchased power expense. This was due to the adoption on October 1, 2003, on a prospective basis, of new accounting rules related to presentation of non-trading derivative activity. Without this netting from sales of purchased power for hedging and optimization, total revenue would have grown by approximately 22% versus 7% as reported.

Additional increases in power plant costs for the three months ended June 30, 2004, as compared to the three months ended June 30, 2003, include a $22.8 million increase in depreciation expense and a $64.0 million increase in plant operating expense. Also, during the three months ended June 30, 2004, financial results were affected by a $115.1 million increase in interest expense and distributions on trust preferred securities, as compared to the same period in 2003. This occurred as a result of higher debt balances, higher average interest rates and lower capitalization of interest expense as new plants entered commercial operation. The results for the three months ended June 30, 2003 included a gain of approximately $52.8 million in connection with terminating a tolling arrangement with a unit of Aquila on the Acadia facility.

The shares of our common stock offered hereby are shares that we have loaned to an affiliate of DB pursuant to a share lending agreement, dated as of September l, 2004, which we refer to as the “share lending agreement.” Under the share lending agreement, we receive a loan fee of $.001 per share. We will not receive any proceeds from this offering. See “Concurrent Offering of Convertible Notes” and “Underwriting” on pages S-41 and S-47, respectively, of this prospectus supplement.

Investing in our common stock involves substantial risk. See the “Risk Factors” section of this prospectus supplement for a description of certain of the risks you should consider before investing in our common stock.

We are a Delaware corporation. Our principal executive office is located at 50 West San Fernando Street, San Jose, California 95113, and our telephone number is (408) 995-5115.

We have derived the following summary historical financial data from our consolidated financial statements. The income statement data for the years ended December 31, 2001, 2002 and 2003 has been derived from our audited consolidated financial statements and related notes, which appear in our Annual Report on Form 10-K/A for the year ended December 31, 2003, which is incorporated by reference in this prospectus supplement. The income statement data for the six months ended June 30, 2003 and 2004 and the balance sheet data as of June 30, 2004 have been derived from our unaudited consolidated financial statements and related notes, which appear in our Quarterly Report on Form 10-Q for the quarter ended June 30, 2004, which is incorporated by reference in this prospectus supplement. In the opinion of management, all adjustments considered necessary for a fair presentation have been included in our unaudited consolidated financial statements. However, the results for the quarters presented below are not necessarily indicative of the results that may be expected for the full fiscal year. You should read this information in conjunction with “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and our financial statements and the related notes included in our Annual Report on Form 10-K/A for the year ended December 31, 2003 and our Quarterly Report on Form 10-Q for the quarter ended June 30, 2004.


(1)	Prior to the adoption of FASB Interpretation No. 46 (revised 2003), the HIGH TIDES were accounted for as a minority interest in our balance sheet and reflected as “Company-obligated mandatorily redeemable convertible preferred securities of subsidiary trusts.” Distributions on the HIGH TIDES were reflected in the statements of operations as “distributions on trust preferred securities” through the third quarter of 2003. Upon the adoption of FIN 46-R, the Calpine Capital Trusts, which are the issuers of the HIGH TIDES and our wholly owned subsidiaries, were deconsolidated from our financial statements. Consequently, effective as of December 31, 2003, the HIGH TIDES are no longer shown on our consolidated balance sheet. Instead, the debentures issued by Calpine to the Calpine Capital Trusts in connection with the issuance of the HIGH TIDES are shown on our balance sheet as “notes payable to Calpine Capital Trusts.” The interest payments on the debentures are reflected in our statements of operations as interest expense.

(2)	This non-GAAP measure is presented not as a measure of operating results, but rather as a measure of our ability to service debt and to raise additional funds. It should not be construed as an alternative to either (i) income from operations or (ii) cash flows from operating activities. It is defined as net income less income from unconsolidated investments, plus cash received from unconsolidated investments, plus provision for tax, plus interest expense (including distributions on trust preferred securities and one-third of operating lease expense, which is management’s estimate of the component of operating lease expense that constitutes interest expense), plus depreciation, depletion and amortization. The interest, tax and depreciation and amortization components of discontinued operations are added back in calculating EBITDA, as adjusted.


(1)	Adjusted to reflect the net effect of (a) the concurrent offering of $600 million of contingent convertible notes due 2014 (which amount does not include the underwriter’s over allotment option) and the use of proceeds therefrom, (b) this offering of common stock, (c) the concurrent offering of our $785 million first priority senior secured notes and the use of proceeds therefrom, (d) the consummation of the sale of certain of our oil and gas assets in New Mexico and Colorado and all of our Canadian natural gas reserves and petroleum assets, and the use of proceeds therefrom, as described in “Summary—Recent Developments—Sale of Certain Natural Gas Reserves and Petroleum Assets; Repayment and Reduction of Commitments Under Senior Secured Credit Facility,” (e) the repurchase of $266,225,000 aggregate principal amount of, plus accrued interest on, our 4.75% Contingent Convertible Notes from DB, and (f) the repurchase of certain of our senior notes and HIGH TIDES and the exchange of certain of our senior notes for shares of our common stock through September 17, 2004, as described in “Summary—Recent Developments—Repurchases of Outstanding Debt.” For more information, see “Use of Proceeds” and “Summary— Recent Developments.”

(2)	The “as adjusted” cash amount does not include the $360 million redeemable preferred shares relating to the Saltend project. See “Recent Developments—$360 Million Preferred Equity Offering.”

(3)	“Notes payable to Calpine Capital Trusts” constitutes the debentures issued by Calpine to the Calpine Capital Trusts, our wholly owned subsidiaries, in connection with the issuance of the HIGH TIDES by the Calpine Capital Trusts. As of June 30, 2004, the liquidation amount outstanding of the HIGH TIDES was $1,153,500,000 and $132,500,000 in liquidation amount of the HIGH TIDES was held by Calpine. As adjusted to give effect to repurchases of HIGH TIDES through September 17, 2004 and the use of proceeds from our concurrent offering of convertible notes, there will be $517,500,000 in notes payable to Calpine Capital Trusts outstanding and $517,500,000 in liquidation amount of the HIGH TIDES will be outstanding, none of which will be held by Calpine.

The following unaudited pro forma summary financial data present our consolidated operations, as adjusted to give effect to our recent sales of certain of our gas and petroleum assets. For more information about those transactions, see “Recent Developments—Sale of Certain Natural Gas Reserves and Petroleum Assets; Repayment and Reduction of Commitments Under Senior Secured Credit Facility.” The pro forma summary financial data for the six months ended June 30, 2004 and for the year ended December 31, 2003 give effect to those transactions as if they had occurred at January 1 of each of those periods. Certain amounts in the pro forma financial data have also been reclassified to conform to the 2004 presentation. These reclassifications did not occur as a result of the transactions involving our gas assets.

The pro forma summary financial data presented below have been prepared based upon currently available information and certain assumptions that we believe are reasonable. These data are for information purposes only and are not necessarily indicative of the results of operations that would have been achieved if the transactions for which we are giving pro forma effect actually occurred on the dates referred to above, nor are such pro forma data necessarily indicative of the results of future operations, because such data are based on estimates of financial effects that may prove to be inaccurate over time. Operating results for the gas assets included in the transactions are their actual operating results from January 1 to their respective dates of sale.

The following financial data should be read in conjunction with our Current Report on Form 8-K/A filed on September 14, 2004 and incorporated by reference herein, as well as with “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and our financial statements and the related notes included in our Annual Report on Form 10-K/ A for the year ended December 31, 2003 included as Appendix A to, and incorporated by reference in, this prospectus supplement, and our Quarterly Report on Form 10-Q for the quarter ended June 30, 2004, included as Appendix B to, and incorporated by reference in, this offering memorandum.


(1)	Represents loss before discontinued operations and cumulative effect of change in accounting principle.


(1)	Includes certain reserves not owned directly by Calpine Corporation. Substantially all of our gas reserves are owned directly by Calpine Corporation.

(2)	Adjusted to reflect the recent sales of certain of our gas reserves. See “— Recent Developments — Sale of Certain Natural Gas Reserves and Petroleum Assets; Repayment and Reduction of Commitments Under Senior Secured Credit Facility.”

(3)	Includes reserves in Colorado, Montana and New Mexico.

(4)	Includes reserves in Montana only.

(5)	Includes 18,080 MMcfe of proved reserves (net of royalties), which represents our prior ownership interest in the proved reserves of the Calpine Natural Gas Trust.

Investing in our common stock involves risk. Before making an investment decision, you should carefully consider the following risks, as well as the risk factors described in our Annual Report on Form 10-K/ A for the year ended December 31, 2003, which is incorporated by reference in this prospectus supplement. Any of the risks described could materially adversely affect our business, financial condition or results of operations. You could lose all or part of your investment if any of the risks and uncertainties described actually occurs.

We have now, and after the offering will continue to have, substantial indebtedness that we may be unable to service and that restricts our activities. We have substantial debt that we incurred to finance the acquisition and development of power generation facilities. On June 30, 2004, after giving pro forma effect to the concurrent offerings of our $785 million first lien senior secured notes and our $600 million aggregate principal amount of contingent convertible notes (which amount does not include the underwriter’s overallotment option) and the repurchase of certain of our senior notes and HIGH TIDES and the exchange of certain senior notes for shares of our common stock through September 17, 2004, we would have had total indebtedness of $18.1 billion. Whether we will be able to meet our debt service obligations and repay, extend or refinance our outstanding indebtedness will depend primarily upon the operational performance of our power generation facilities and of our oil and gas properties, movements in electric and natural gas prices over time, and our marketing and risk management activities.

This high level of indebtedness could have important consequences for you and the company, including:


	•	making it more difficult to satisfy our obligations with respect to our debt securities;

	•	limiting our ability to borrow additional amounts for working capital, capital expenditures, debt service requirements, execution of our growth strategy, or other purposes;

	•	limiting our ability to use operating cash flow in other areas of our business because we must dedicate a substantial portion of these funds to service the debt;

	•	increasing our vulnerability to general adverse economic and industry conditions;

	•	limiting our ability to capitalize on business opportunities and to react to competitive pressures and adverse changes in government regulation;

	•	limiting our ability or increasing the costs to refinance indebtedness; and

	•	limiting our ability to enter into marketing, hedging, optimization and trading transactions by reducing the number of counterparties with whom we can transact as well as the volume of those transactions.

Our debt instruments impose significant operating and financial restrictions on us. Any failure to comply with these restrictions could have a material adverse effect on our liquidity and our operations.

The indentures and other agreements governing our outstanding debt impose significant operating and financial restrictions on us. These covenants could adversely affect us, and adversely affect investors, by limiting our ability to plan for or react to market conditions or to


	•	incur additional indebtedness and issue preferred stock;

	•	pay dividends and other distributions with respect to our capital stock or repurchase our capital stock or make other restricted payments;

	•	enter into transactions with affiliates;

	•	create or incur liens to secure debt;

	•	make certain investments;

	•	transfer or sell certain assets;

	•	incur dividend or other payment restrictions affecting certain subsidiaries;

	•	make capital expenditures;

	•	use the proceeds of permitted sales of our assets;

	•	engage in certain business activities; and

	•	engage in certain mergers or consolidations and transfers of substantially all assets.

Our ability to comply with these covenants may be affected by events beyond our control, and any material deviations from our forecasts could require us to seek waivers or amendments of covenants or alternative sources of financing or to reduce expenditures. We cannot assure you that such waivers, amendments or alternative financing could be obtained, or if obtained, would be on terms acceptable to us.

A breach of any of the covenants or restrictions contained in any of our existing or future financing agreements could result in an event of default under those agreements and, due to cross-default and cross-acceleration provisions, under our other debt instruments. Upon a default under our financing agreements, the lenders could elect to declare all borrowings outstanding thereunder to be due and payable and could terminate any commitments they had made to supply us with further funds. If any of these events occur, we cannot assure you that we will have sufficient funds available to repay in full the total amount of obligations that become due as a result of any such acceleration, or that we will be able to find additional or alternative financing to refinance any accelerated obligations.

Since the latter half of 2001, there has been a significant contraction in the availability of capital for participants in the energy sector. This has been due to a range of factors, including uncertainty arising from the collapse of Enron Corp. and a perceived surplus of electric generating capacity. These factors have continued through 2004, during which time contracting credit markets and decreased spark spreads have adversely impacted our liquidity and earnings. While we have been able to access the capital and bank credit markets, it has been on significantly different terms than in the past. We recognize that terms of financing available to us in the future may not be attractive. To protect against this possibility and due to current market conditions, we scaled back our capital expenditure program to enable us to conserve our available capital resources.

We are subject to a holders’ put on December 26, 2004, which may require us to repurchase all or a portion of the aggregate principal amount of 4% Convertible Senior Notes due 2006, or the 2006 Convertible Senior Notes, then outstanding with our choice of cash, stock or a combination thereof. In the first quarter of 2004, we completed a cash tender offer

In addition, $276.0 million of our outstanding Remarketable Term Income Deferrable Equity Securities, or HIGH TIDES, are scheduled to be remarketed no later than November 1, 2004, $360.0 million of our HIGH TIDES are scheduled to be remarketed no later than February 1, 2005, and $517.5 million of our HIGH TIDES are scheduled to be remarketed no later than August 1, 2005. In the event of a failed remarketing, the relevant HIGH TIDES will remain outstanding as convertible securities at a term rate equal to the treasury rate plus 6% per annum and with a term conversion price equal to 105% of the average closing price of our common stock for the five consecutive trading days after the applicable final failed remarketing termination date.

We have $185.9 million in aggregate principal amount of 8 1/4% Senior Notes due 2005 and $148.1 million aggregate principal amount of notes issued in connection with the monetization of a power contract with the California Department of Water Resources, or DWR, which will mature in 2005. In addition to the debt instruments discussed above, as of June 30, 2004, we had approximately $144.8 million and $749.7 million of miscellaneous debt and capital lease obligations that are maturing or for which scheduled principal payments will be made in 2005 and 2006, respectively.

We cannot assure you that our business will generate sufficient cash flow from operations or that future borrowings will be available to us in an amount sufficient to enable us to pay our indebtedness when due, or to fund our other liquidity needs. We may need to refinance all or a portion of our indebtedness, on or before maturity. While we believe we will be successful in refinancing all of our debt on or before maturity, we cannot assure you that we will be able to do so.

Each power generation facility that we acquire or develop will require substantial capital investment. Our ability to arrange financing (including any extension or refinancing) and the cost of the financing are dependent upon numerous factors. Access to capital (including any extension or refinancing) for participants in the energy sector, including for us, has been significantly restricted since late 2001. Other factors include:


	•	general economic and capital market conditions;

	•	conditions in energy markets;

	•	regulatory developments;

	•	credit availability from banks or other lenders for us and our industry peers, as well as the economy in general;

	•	investor confidence in the industry and in us;

	•	the continued success of our current power generation facilities; and

	•	provisions of tax and securities laws that are conducive to raising capital.

We have financed our existing power generation facilities using a variety of leveraged financing structures, consisting of senior secured and unsecured indebtedness, including construction financing, project financing, revolving credit facilities, term loans and lease obligations. As of June 30, 2004, we had approximately $18.1 billion of total consolidated funded debt, consisting of $5.0 billion of secured construction/ project financing, $0.3 billion of capital lease obligations, $9.4 billion in senior notes and term loans, $1.0 billion in convertible senior notes, $0.2 billion in preferred interests, $1.2 billion of trust preferred securities and $1.1 billion of secured and unsecured notes payable and borrowings under lines of credit. Each

project financing and lease obligation is structured to be fully paid out of cash flow provided by the facility or facilities financed or leased. In the event of a default under a financing agreement which we do not cure, the lenders or lessors would generally have rights to the facility and any related assets. In the event of foreclosure after a default, we might not retain any interest in the facility. While we intend to utilize non-recourse or lease financing when appropriate, market conditions and other factors may prevent similar financing for future facilities. It is possible that we may be unable to obtain the financing required to develop our power generation facilities on terms satisfactory to us.

We have from time to time guaranteed certain obligations of our subsidiaries and other affiliates. Our lenders or lessors may also seek to have us guarantee the indebtedness for future facilities. Guarantees render our general corporate funds vulnerable in the event of a default by the facility or related subsidiary. Additionally, certain of our indentures may restrict our ability to guarantee future debt, which could adversely affect our ability to fund new facilities. Our indentures do not limit the ability of our subsidiaries to incur non-recourse or lease financing for investment in new facilities.

On July 17, 2003, Standard & Poor’s placed our corporate rating (currently rated at B), our senior unsecured debt rating (currently at CCC+), our preferred stock rating (currently at CCC), our bank loan rating (currently at B), and our second priority senior secured debt rating (currently at B) under review for possible downgrade.

On July 23, 2003, Fitch, Inc. downgraded our long-term senior unsecured debt rating from B+ to B- (with a stable outlook), our preferred stock rating from B- to CCC (with a stable outlook), and initiated coverage of our senior secured debt rating at BB- (with a stable outlook).

On October 20, 2003, Moody’s downgraded the rating of our long-term senior unsecured debt from B1 to Caa1 (with a stable outlook) and our senior implied rating from Ba3 to B2 (with a stable outlook). The ratings on our senior unsecured debt, senior unsecured convertible debt and convertible preferred securities were also lowered (with a stable outlook) from B1 to Caa1, from B1 to Caa1 and from B2 to Caa3, respectively.

Many other issuers in the power generation sector have also been downgraded by one or more of the rating agencies during this period. Such downgrades can have a negative impact on our liquidity by reducing attractive financing opportunities and increasing the amount of collateral required by trading counterparties. We cannot assure you that Moody’s, Fitch and Standard & Poor’s will not further downgrade our credit ratings in the future. If our credit rating is downgraded, we could be required to, among other things, pay additional interest under our credit agreements, or provide additional guarantees, collateral, letters of credit or cash for credit support obligations, and it could increase our cost of capital, make our efforts to raise capital more difficult and have an adverse impact on our subsidiaries’ and our business, financial condition and results of operations. The completion of this offering could have a negative impact on the rating of the company or its debt.

Our ability to repay our debt depends upon the performance of our subsidiaries.

Almost all of our operations are conducted through our subsidiaries and other affiliates. As a result, we depend almost entirely upon their earnings and cash flow to service our indebtedness, including our ability to pay the interest and principal of our senior notes. The financing agreements of certain of our subsidiaries and other affiliates generally restrict their ability to pay dividends, make distributions, or otherwise transfer funds to us prior to the payment of their other obligations, including their outstanding debt, operating expenses, lease payments and reserves. While our debt instruments limit our ability to enter into agreements

that restrict our ability to receive dividends and other distributions from our subsidiaries, these limitations are subject to a number of significant exceptions (including exceptions permitting restrictions arising out of subsidiary financing). Furthermore, our subsidiaries are separate and distinct legal entities and, except in limited circumstances, have no obligation to pay any amounts due with respect to our indebtedness.

Revenue may be reduced significantly upon expiration or termination of our power sales agreements.

Some of the electricity we generate from our existing portfolio is sold under long-term power sales agreements that expire at various times. We also sell power under short- to intermediate-term (one to five year) contracts. When the terms of each of these various power sales agreements expire, it is possible that the price paid to us for the generation of electricity under subsequent arrangements may be reduced significantly.

Use of derivatives can create volatility in earnings and may require significant cash collateral.

During 2003, we recognized $26.4 million in mark-to-market losses on electric power and natural gas derivatives. Additionally, we recognized as a cumulative effect of a change in accounting principle, an after-tax gain of approximately $181.9 million from the adoption of Derivatives Implementation Group, or DIG, Issue No. C20, “Scope Exceptions: Interpretation of the Meaning of Not Clearly and Closely Related in Paragraph 10(b) regarding Contracts with a Price Adjustment Feature” on October 1, 2003. Please see “Management’s Discussion and Analysis of Financial Condition and Results of Operation— Impact of Recent Accounting Pronouncements” in our Annual Report on Form 10-K/A for the year ended December 31, 2003, incorporated by reference in this prospectus supplement, for a detailed discussion of the accounting requirements relating to electric power and natural gas derivatives. In addition, Generally Accepted Accounting Principles treatment of derivatives in general, and particularly in our industry, continues to evolve. We may enter into other transactions in future periods that require us to mark various derivatives to market through earnings. The nature of the transactions that we enter into and the volatility of natural gas and electric power prices will determine the volatility of earnings that we may experience related to these transactions.

As a result, in part, of the fallout from Enron Corp.’s declaration of bankruptcy on December 2, 2001, companies using derivatives have become more sensitive to the inherent risks of such transactions. Consequently, many companies, including us, are required to post cash collateral for certain derivative transactions in excess of what was previously required. As of June 30, 2004, we had $227.9 million in margin deposits with counterparties, net of deposits posted by counterparties with us, and had posted $3.5 million of letters of credit, compared to $188.0 million and $14.5 million, respectively, at December 31, 2003. Future cash collateral requirements may increase based on the extent of our involvement in derivative activities and movements in commodity prices and also based on our credit ratings and general perception of creditworthiness in this market.

We may be unable to obtain an adequate supply of natural gas in the future.

To date, our fuel acquisition strategy has included various combinations of our own gas reserves, gas prepayment contracts, short-term, medium-term and long-term supply contracts, and gas hedging transactions. In our gas supply arrangements, we attempt to match the fuel cost with the fuel component included in the facility’s power sales agreements in order to minimize a project’s exposure to fuel price risk. In addition, the focus of CES is to manage the “spark spread” for our portfolio of generating plants— the spread between the cost of fuel and electricity revenues— and we actively enter into hedging transactions to lock in gas costs and spark spreads. We believe that there will be adequate supplies of natural gas available at

reasonable prices for each of our facilities when current gas supply agreements expire. However, gas supplies may not be available for the full term of the facilities’ power sales agreements, and gas prices may increase significantly. Additionally, our credit ratings may inhibit our ability to procure gas supplies from third parties. If gas is not available, or if gas prices increase above the level that can be recovered in electricity prices, there could be a negative impact on our results of operations or financial condition.

Our power project development and acquisition activities may not be successful.

The development of power generation facilities is subject to substantial risks. In connection with the development of a power generation facility, we must generally obtain:


	•	necessary power generation equipment;

	•	governmental permits and approvals;

	•	fuel supply and transportation agreements;

	•	sufficient equity capital and debt financing;

	•	electrical transmission agreements;

	•	water supply and wastewater discharge agreements; and

	•	site agreements and construction contracts.

We may be unsuccessful in accomplishing any of these matters or in doing so on a timely basis. In addition, project development is subject to various environmental, engineering and construction risks relating to cost overruns, delays and performance. Although we may attempt to minimize the financial risks in the development of a project by securing a favorable power sales agreement, obtaining all required governmental permits and approvals, and arranging adequate financing prior to the commencement of construction, the development of a power project may require us to expend significant sums for preliminary engineering, permitting, legal and other expenses before we can determine whether a project is feasible, economically attractive or financeable. If we are unable to complete the development of a facility, we might not be able to recover our investment in the project. The process for obtaining initial environmental, siting and other governmental permits and approvals is complicated and lengthy, often taking more than one year, and is subject to significant uncertainties. We cannot assure you that we will be successful in the development of power generation facilities in the future or that we will be able to successfully complete construction of the facilities, nor can we assure you that these facilities will be profitable or have value equal to the investment in them even if they do achieve commercial operation.

We have grown substantially in recent years partly as a result of acquisitions of interests in power generation facilities, geothermal steam fields and natural gas reserves and facilities.

The integration and consolidation of our acquisitions with our existing business requires substantial management, financial and other resources and, ultimately, our acquisitions may not be successfully integrated. In addition, as we transition from a development company to an operating company, we are not likely to continue to grow at historical rates due to reduced acquisition activities in the near future. Thus we have also substantially curtailed our development efforts in response to our reduced liquidity. Although the domestic power industry is continuing to undergo consolidation and may offer acquisition opportunities at favorable prices, we believe that we are likely to confront significant competition for those opportunities and, due to the constriction in the availability of capital resources for acquisitions and other expansion, to the extent that any opportunities are identified, we may be unable to effect any acquisitions. Similarly, to the extent we seek to divest assets, we may not be able to do so at attractive prices.

The commencement of operation of a newly constructed power generation facility involves many risks, including:


	•	start-up problems;

	•	the breakdown or failure of equipment or processes; and

	•	performance below expected levels of output or efficiency.

New plants have no operating history and may employ recently developed and technologically complex equipment. Insurance (including a layer of insurance provided by a captive insurance subsidiary) is maintained to protect against certain risks, warranties are generally obtained for limited periods relating to the construction of each project and its equipment in varying degrees, and contractors and equipment suppliers are obligated to meet certain performance levels. The insurance, warranties or performance guarantees, however, may not be adequate to cover lost revenues or increased expenses. As a result, a project may be unable to fund principal and interest payments under its financing obligations and may operate at a loss. A default under such financing obligation, unless cured, could result in our losing our interest in a power generation facility.

In certain situations, power sales agreements entered into with a utility early in the development phase of a project may enable the utility to terminate the power sales agreement or to retain security posted as liquidated damages under the agreement. Currently, six of our twelve projects under construction are party to power sales agreements containing such provisions and could be materially affected if these provisions were triggered. The six projects are our Freeport, Valladolid, Mankato, Bethpage, Fox and Otay Mesa facilities. The situations that could allow a utility to terminate a power sales agreement or retain posted security as liquidated damages include:


	•	the cessation or abandonment of the development, construction, maintenance or operation of the facility;

	•	failure of the facility to achieve construction milestones or commercial operation by agreed upon deadlines, subject to extensions due to force majeure events;

	•	failure of the facility to have achieved certain output minimums;

	•	failure by the facility to make any of the payments owing to the utility under the power sales agreement or to establish, maintain, restore, extend the term of, or increase the posted security if required by the power sales agreement;

	•	a material breach of a representation or warranty or failure by the facility to observe, comply with or perform any other material obligation under the power sales agreement;

	•	failure of the facility to obtain material permits and regulatory approvals by agreed upon deadlines; or

	•	the liquidation, dissolution, insolvency or bankruptcy of the facility.

Upon completion of our projects currently under construction, we will operate 101 of the 103 power plants in which we will have an interest. The continued operation of power generation facilities, including, upon completion of construction, the facilities owned directly by Calpine, involves many risks, including the breakdown or failure of power generation equipment, transmission lines, pipelines or other equipment or processes, and performance below expected levels of output or efficiency. Although from time to time our power generation facilities have experienced equipment breakdowns or failures, these breakdowns or failures have not had a

significant effect on the operation of the facilities or on our results of operations. For 2003, our gas-fired and geothermal power generation facilities operated at an average availability of approximately 91% and 97%, respectively. Although our facilities contain various redundancies and back-up mechanisms, a breakdown or failure may prevent the affected facility from performing under applicable power sales agreements. In addition, although insurance is maintained to protect against operating risks, the proceeds of insurance may not be adequate to cover lost revenues or increased expenses. As a result, we could be unable to service principal and interest payments under our financing obligations, which could result in losing our interest in one or more power generation facilities.

We cannot assure you that our estimates of oil and gas reserves are accurate.

Estimates of proved oil and gas reserves and the future net cash flows attributable to those reserves are prepared by independent petroleum and geological engineers. There are numerous uncertainties inherent in estimating quantities of proved oil and gas reserves and cash flows attributable to such reserves, including factors beyond our control and that of our engineers. Reserve engineering is a subjective process of estimating underground accumulations of oil and gas that cannot be measured in an exact manner. The accuracy of an estimate of quantities of reserves, or of cash flows attributable to such reserves, is a function of the available data, assumptions regarding future oil and gas prices and expenditures for future development and exploitation activities, and of engineering and geological interpretation and judgment. Additionally, reserves and future cash flows may be subject to material downward or upward revisions based upon production history, development and exploration activities and prices of oil and gas. Actual future production, revenue, taxes, development expenditures, operating expenses, underlying information, quantities of recoverable reserves and the value of cash flows from such reserves may vary significantly from the assumptions and underlying information set forth herein. In addition, different reserve engineers may make different estimates of reserves and cash flows based on the same available data.

The development and operation of geothermal energy resources are subject to substantial risks and uncertainties similar to those experienced in the development of oil and gas resources. The successful exploitation of a geothermal energy resource ultimately depends upon:


	•	the heat content of the extractable steam or fluids;

	•	the geology of the reservoir;

	•	the total amount of recoverable reserves;

	•	operating expenses relating to the extraction of steam or fluids;

	•	price levels relating to the extraction of steam or fluids or power generated; and

	•	capital expenditure requirements relating primarily to the drilling of new wells.

In connection with each geothermal power plant, we estimate the productivity of the geothermal resource and the expected decline in productivity. The productivity of a geothermal resource may decline more than anticipated, resulting in insufficient reserves being available for sustained generation of the electrical power capacity desired. An incorrect estimate by us or an unexpected decline in productivity could, if material, adversely affect our results of operations or financial condition.

Geothermal reservoirs are highly complex. As a result, there exist numerous uncertainties in determining the extent of the reservoirs and the quantity and productivity of the steam reserves. Reservoir engineering is an inexact process of estimating underground accumulations of steam or fluids that cannot be measured in any precise way, and depends significantly on the quantity

and accuracy of available data. As a result, the estimates of other reservoir specialists may differ materially from ours. Estimates of reserves are generally revised over time on the basis of the results of drilling, testing and production that occur after the original estimate was prepared. We cannot assure that we will be able to successfully manage the development and operation of our geothermal reservoirs or that we will accurately estimate the quantity or productivity of our steam reserves.

Our systems of power generation facilities rely on one or more power sales agreements with one or more utilities or other customers for a substantial portion of our revenue. While electricity is a fungible commodity and the loss of any one customer could be mitigated by selling our power into the market, some of our contracts contain pricing provisions more favorable than those that could be obtained currently in the market. The loss of any of our contracts with such favorable pricing provisions would negatively affect our margins. In addition, sales of electricity to one customer during 2003, DWR, comprised approximately 14% of our total revenue that year. After aggregating our power sales agreements by specific counterparty, DWR is currently the only significant customer based on revenues within our portfolio of existing power sales agreements. Additionally, all of our contracts with DWR contain termination provisions consistent with those standard in the industry. For further information on our revenues and receivables from DWR, see Note 21 of the Notes to consolidated financial statements included in our Annual Report on Form 10-K/A for the year ended December 31, 2003, which is incorporated by reference in this prospectus supplement. The loss of significant power sales agreements with DWR or an adverse change in DWR’s ability to pay for power delivered under our contracts could have a negative effect on our results of operations. In addition, any material failure by any customer to fulfill its obligations under a power sales agreement could have a negative effect on the cash flow available to us and on our results of operations.

The power generation industry is characterized by intense competition, and we encounter competition from utilities, industrial companies and other independent power producers. In recent years, there has been increasing competition among generators in an effort to obtain power sales agreements, and this competition has contributed to a reduction in electricity prices in certain markets. In addition, many states are implementing or considering regulatory initiatives designed to increase competition in the domestic power industry. In California, the California Public Utilities Commission, or CPUC, issued decisions that provide for direct access for all customers as of April 1, 1998; however, the CPUC suspended direct access in California effective September 20, 2001, due to the problems that arose in California’s newly deregulated markets. As a result, uncertainty exists as to the future course for direct access in California in the aftermath of the energy crisis in that state. In Texas, legislation phased in a deregulated power market, which commenced on January 1, 2001. This competition has put pressure on electric utilities to lower their costs, including the cost of purchased electricity, and increasing competition in the supply of electricity in the future will increase this pressure.

We have an investment in an energy service business in the Netherlands, an investment in a power generation facility in development in Mexico, and an investment in a power generation facility in the U.K. that is in operation, and we may pursue additional international investments in the future subject to the limitations on our expansion plans due to current capital market constraints. International investments are subject to unique risks and uncertainties relating to


	•	fluctuations in currency valuation;

	•	currency inconvertibility;

	•	expropriation and confiscatory taxation;

	•	increased regulation; and

	•	approval requirements and governmental policies limiting returns to foreign investors.

The volatility in the California power market from mid-2000 through mid-2001 has produced significant unanticipated results.

We may be required to make refund payments to the CalPX and CAISO as a result of the California Refund Proceeding.


	On August 2, 2000, the California Refund Proceeding was initiated by a complaint made at the Federal Energy Regulatory Commission, or FERC, by San Diego Gas & Electric Company and under Section 206 of the Federal Power Act alleging, among other things, that the markets operated by the California Independent System Operator, or CAISO, and the California Power Exchange, or CalPX, were dysfunctional. In addition to commencing an inquiry regarding the market structure, FERC has established a refund effective period of October 2, 2000, to June 19, 2001, for sales made into those markets, but will be holding additional proceedings to determine whether the refund effective period should begin prior to October 2, 2000.

	On December 12, 2002, the Administrative Law Judge issued a Certification of Proposed Finding on California Refund Liability or the December 12 Certification, making an initial determination of refund liability. On March 26, 2003, FERC also issued an order adopting the findings set forth in the December 12, 2002 Certification, or the March 26 Order. In addition, as a result of certain findings by FERC staff concerning the unreliability or misreporting of certain reported indices for gas prices in California during the refund period, FERC ordered that the basis for calculating a party’s potential refund liability be modified by substituting a gas proxy price based upon gas prices in the producing areas plus the tariff transportation rate for the California gas price indices previously adopted in the refund proceeding. We believe, based on the information that we have analyzed to date, that any refund liability that may be attributable to us will increase modestly, from approximately $6.2 million to at least $8.4 million, after taking the appropriate set-offs for outstanding receivables owed by the CalPX and CAISO to Calpine. We have fully reserved the amount of refund liability that by our current analysis would potentially be owed under the refund calculation clarification in the March 26 order. We note that, in March 2004, CAISO transmitted new tentative price data as part of the process of further refining the refund calculation. We have not completed our analysis of this new tentative price data (which has not been approved by FERC and is subject to change), but it is possible that the revised price data will result in an increase in the refund liability that may be attributable to us. The final determination of the refund liability is subject to further Commission proceedings to ascertain the final refund effective period and the allocation of payment obligations among the numerous buyers and sellers in the California markets. At this time, we are unable to predict the timing of the completion of these proceedings or the final refund liability. Thus, the impact on our business is uncertain.

We have been mentioned in a show cause order in connection with the FERC investigation into western markets regarding the CalPX and CAISO tariffs and may be found liable for payments thereunder.


	On February 13, 2002, FERC initiated an investigation of potential manipulation of electric and natural gas prices in the western United States. This investigation was initiated as a result of allegations that Enron Corp. and others used their market position to distort electric and natural gas markets in the West. The scope of the investigation is to consider whether, as a result of any manipulation in the short-term markets for electric energy or natural gas or other undue influence on the wholesale markets by any party since January 1, 2000, the rates of the long-term contracts subsequently entered into in the West are potentially unjust and unreasonable. FERC has stated that it may use the information gathered in connection with the investigation to determine how to proceed on any existing or future complaint brought under Section 206 of the Federal Power Act involving long-term power contracts entered into in the West since January 1, 2000, or to initiate a Federal Power Act Section 206 or Natural Gas Act Section 5 proceeding on its own initiative. On August 13, 2002, FERC staff issued the Initial Report on Company-Specific Separate Proceedings and Generic Reevaluations; Published Natural Gas Price Data; and Enron Trading Strategies, or the Initial Report, summarizing its initial findings in this investigation. There were no findings or allegations of wrongdoing by Calpine set forth or described in the Initial Report. On March 26, 2003, FERC staff issued a final report in this investigation. FERC staff recommended that FERC issue a show cause order to a number of companies, including Calpine, regarding certain power scheduling practices that may have been in violation of the CAISO’s or CalPXs’ tariff. The final report also recommended that FERC modify the basis for determining potential liability in the California Refund Proceeding discussed above. Calpine believes that it did not violate these tariffs and that, to the extent that such a finding could be made, any potential liability would not be material.

	On June 25, 2003 FERC issued a number of orders associated with these investigations, including the issuance of two show cause orders to certain industry participants. FERC did not subject Calpine to either of the show cause orders. FERC also issued an order directing the FERC Office of Markets and Investigations to investigate further whether market participants who bid a price in excess of $250 per megawatt-hour into markets operated by either the CAISO or the CalPX during the period of May 1, 2000, to October 2, 2000, may have violated CAISO and CalPX tariff prohibitions. No individual market participant was identified. We believe that we did not violate the CAISO and CalPX tariff prohibitions referred to by FERC in this order; however, we are unable to predict at this time the final outcome of this proceeding or its impact on Calpine.

The energy payments made to us under our qualifying facility contracts with Pacific Gas and Electric Company may be retroactively adjusted downward as a result of the CPUC proceeding regarding Qualifying Facility contract pricing for past periods.

Our contracts with Pacific Gas and Electric Company, or PG&E, for qualifying facilities, or QFs (further described below), provide that the CPUC has the authority to determine the appropriate utility “avoided cost” to be used to set energy payments for certain QF contracts by determining the short-run avoided cost energy price formula. In mid-2000 our QF facilities elected the option set forth in Section 390 of the California Public Utility Code, which provides QFs the right to elect to receive energy payments based on the CalPX market clearing price instead of the price determined by short-run avoided cost. Having elected such option, we were paid based upon the CalPX zonal day-ahead clearing price, or CalPX Price, from summer 2000 until January 19, 2001, when the CalPX ceased operating a day-ahead market. The CPUC has conducted proceedings (R.99-11-022) to determine whether the CalPX Price was the appropriate price for the energy component upon which to

base payments to QFs which had elected the CalPX-based pricing option. The CPUC at one point issued a proposed decision to the effect that the CalPX Price was the appropriate price for energy payments under the California Public Utility Code but tabled it, and a final decision has not been issued to date. Therefore, it is possible that the CPUC could order a payment adjustment based on a different energy price determination. On April 29, 2004, PG&E, The Utility Reform Network, which is a consumer advocacy group, and the Office of Ratepayer Advocates, which is an independent consumer advocacy department of the CPUC (collectively, the “PG&E Parties”) filed a Motion for Briefing Schedule Regarding True-Up of Payments to QF Switchers (the “April 29 Motion”). The April 29 Motion requests that the CPUC set a briefing schedule under the R.99-11-022 to determine refund liability of the QFs that had switched to the CalPX Price during the period of June 1, 2000, until January 19, 2001. The PG&E Parties allege that refund liability be determined using the methodology that has been developed thus far in the California Refund Proceeding discussed above. We believe that the CalPX Price was the appropriate price for energy payments and that the basis for any refund liability based on the interim determination by FERC in the California Refund Proceeding is unfounded, but there can be no assurance that this will be the outcome of the CPUC proceedings.

The availability payments made to us under our Geysers’ Reliability Must Run contracts have been challenged by certain buyers as having been not just and reasonable.

California Independent System Operator, California Electricity Oversight Board, Public Utilities Commission of the State of California, PG&E, San Diego Gas & Electric Company, and Southern California Edison, collectively referred to as the “Buyers Coalition,” filed a complaint on November 2, 2001 at FERC requesting the commencement of a Federal Power Act Section 206 proceeding to challenge one component of a number of separate settlements previously reached on the terms and conditions of “reliability must run” contracts, or RMR Contracts, with certain generation owners, including Geysers Power Company, LLC, which settlements were also previously approved by FERC. RMR Contracts require the owner of the specific generation unit to provide energy and ancillary services when called upon to do so by the independent system operator, or ISO, to meet local transmission reliability needs or to manage transmission constraints. The Buyers Coalition has asked FERC to find that the availability payments under these RMR Contracts are not just and reasonable. Geysers Power Company, LLC filed an answer to the complaint in November 2001. To date, FERC has not established a Section 206 proceeding. The outcome of this litigation and the impact on our business cannot be determined at the present time.

We are subject to complex government regulation which could adversely affect our operations.

Our activities are subject to complex and stringent energy, environmental and other governmental laws and regulations. The construction and operation of power generation facilities and oil and gas exploration and production require numerous permits, approvals and certificates from appropriate foreign, federal, state and local governmental agencies, as well as compliance with environmental protection legislation and other regulations. While we believe that we have obtained the requisite approvals and permits for our existing operations and that our business is operated in accordance with applicable laws, we remain subject to a varied and complex body of laws and regulations that both public officials and private individuals may seek to enforce. Existing laws and regulations may be revised or reinterpreted, or new laws and regulations may become applicable to us that may have a negative effect on our business and results of operations. We may be unable to obtain all necessary licenses, permits, approvals and certificates for proposed projects, and completed facilities may not comply with all applicable permit conditions, statutes or regulations. In addition, regulatory compliance for the

construction of new facilities is a costly and time-consuming process. Intricate and changing environmental and other regulatory requirements may necessitate substantial expenditures to obtain permits. If a project is unable to function as planned due to changing requirements or local opposition, may create expensive delays or significant loss of value in a project.

Environmental regulations have had and will continue to have an impact on our cost of doing business and our investment decisions. For example, the existing market-based cap-and-trade emissions allowance system in Texas requires operators to either reduce nitrogen oxide emissions or purchase additional nitrogen oxide allowances in the marketplace. Rather than purchase additional allowances, we have chosen to install additional nitrogen oxide emission controls as part of a $31 million steam capacity upgrade at our Texas City facility and to retrofit our Clear Lake, Texas facility with similar technology at a cost of approximately $17 million. These new emission control systems will allow us to meet our thermal customers’ needs while reducing the need to purchase allowances for our facilities in Texas.

Our operations are potentially subject to the provisions of various energy laws and regulations, including the Public Utility Regulatory Policies Act of 1978, or PURPA, the Public Utility Holding Company Act of 1935, or PUHCA, the Federal Power Act of 1935, or FPA, and state and local regulations. PUHCA provides for the extensive regulation of public utility holding companies and their subsidiaries. PURPA provides QFs and owners of QFs exemptions from certain federal and state regulations, including rate and financial regulations. The FPA regulates wholesale sales of power, as well as electric transmission in interstate commerce.

Under current federal law, we are not subject to regulation as a holding company under PUHCA, and will not be subject to such regulation as long as the plants in which we have an interest (1) qualify as QFs, (2) are subject to another exemption or waiver or (3) qualify as an exempt wholesale generator under the Energy Policy Act of 1992. In order to be a QF, a facility must be not more than 50% owned by one or more electric utility company or electric utility holding company. Generally, any geothermal power facility which produces up to 80 megawatts of electricity and meets PURPA ownership requirements is considered a QF. In addition, a QF that is a cogeneration facility, such as the plants in which we currently have interests, must produce electricity as well as thermal energy for use in an industrial or commercial process in specified minimum proportions. The QF also must meet certain minimum energy efficiency standards.

If any of the plants in which we have an interest lose their QF status or if amendments to PURPA are enacted that substantially reduce the benefits currently afforded QFs, we could become a public utility holding company, which could subject us to significant federal, state and local regulation, including rate regulation. If we become a holding company, which could be deemed to occur prospectively or retroactively to the date that any of our plants loses its QF status, all of our other QF power plants could lose QF status because, under FERC regulations, a QF cannot be owned by an electric utility or electric utility holding company. In addition, a loss of QF status could, depending on the particular power purchase agreement, allow the power purchaser to cease taking and paying for electricity or to seek refunds of past amounts paid and thus could cause the loss of some or all contract revenues or otherwise impair the value of a project. If a power purchaser were to cease taking and paying for electricity, there can be no assurance that the costs incurred in connection with the project could be recovered through sales to other purchasers. Such events could adversely affect our ability to service our indebtedness. See “Item 1— Business— Government Regulation— Federal Energy Regulation— Federal Power Act Regulation” in our Annual Report on Form 10-K/A for the year ended December 31, 2003, which is incorporated by reference in this prospectus supplement. A cogeneration QF could lose its QF status if it does not continue to meet FERC’s operating and efficiency requirements. Such possible loss of QF status could occur, for example, if the QF’s steam host, typically an industrial facility, fails for operating, permit or economic reasons to use

Currently, Congress is considering proposed legislation that would repeal PUHCA, and would amend PURPA by limiting its mandatory purchase obligation to existing contracts in those regions of the country that are found to have competitive energy markets. In light of the circumstances in California, the PG&E bankruptcy and the Enron Corp. bankruptcy, among other events in recent years, there are a number of federal legislative and regulatory initiatives that could result in changes in how the energy markets are regulated. We do not know whether these legislative or regulatory initiatives will be adopted or, if adopted, what form they may take. We cannot provide assurance that any legislation or regulation ultimately adopted would not adversely affect our existing domestic projects.

In addition, many states are implementing or considering regulatory initiatives designed to increase competition in the domestic power generation industry and increase access to electric utilities’ transmission and distribution systems for independent power producers and electricity consumers. However, in light of the circumstances in the California power markets and the bankruptcies of both PG&E and Enron Corp, the pace and direction of further deregulation at the state level in many jurisdictions is uncertain. See “—The unresolved issues arising from the California power market, where 39 of our 91 power plants are located, could adversely affect our performance.”

Our success is largely dependent on the skills, experience and efforts of our people. While we believe that we have excellent depth throughout all levels of management and in all key skill levels of our employees, the loss of the services of one or more members of our senior management or of numerous employees with critical skills could have a negative effect on our business, financial conditions and results of operations and future growth. We have employment agreements with certain of our key employees, including our Chief Executive Officer and Chief Financial Officer.

Areas where we operate and are developing many of our geothermal and gas-fired projects are subject to frequent low-level seismic disturbances. More significant seismic disturbances are possible. Our existing power generation facilities are built to withstand relatively significant levels of seismic disturbances, and we believe we maintain adequate insurance protection. However, earthquake, property damage or business interruption insurance may be inadequate to cover all potential losses sustained in the event of serious seismic disturbances. Additionally, insurance for these risks may not continue to be available to us on commercially reasonable terms.

Our quarterly operating results have fluctuated in the past and may continue to do so in the future as a result of a number of factors, including:


	•	seasonal variations in energy prices;

	•	variations in levels of production;

	•	the timing and size of acquisitions; and

	•	the completion of development projects.

Additionally, because we receive the majority of capacity payments under some of our power sales agreements during the months of May through October, our revenues and results of operations are, to some extent, seasonal.

We are party to various litigation matters arising out of the normal course of business, the more significant of which are summarized in “Item 3. Legal Proceedings” in our Annual Report on Form 10-K/A for the year ended December 31, 2003, which is incorporated by reference in this prospectus supplement and in “Part II— Item 1. Legal Proceedings” in our Quarterly Report on Form 10-Q for the quarter ended June 30, 2004, which is incorporated by reference in this prospectus supplement. These matters include securities class action lawsuits, such as Hawaii Structural Ironworkers Pension Fund v. Calpine et al., which relates to our April 2002 equity offering and also named the underwriters of that offering as defendants. The ultimate outcome of each of these matters cannot presently be determined, nor can the liability that may potentially result from a negative outcome be reasonably estimated presently for every case. The liability we may ultimately incur with respect to any one of these matters in the event of a negative outcome may be in excess of amounts currently accrued with respect to such matters and, as a result, these matters may potentially be material to our financial condition and results of operations.

The market price for our common stock has been volatile in the past, and several factors could cause the price to fluctuate substantially in the future. These factors include without limitation:


	•	general conditions in our industry, the power markets in which we participate, or the worldwide economy;

	•	announcements of developments related to our business or sector;

	•	fluctuations in our results of operations;

	•	our debt-to-equity ratios and other leverage ratios;

	•	effects of significant events relating to the energy sector in general;

	•	sales of substantial amounts of our securities into the marketplace;

	•	an outbreak of war or hostilities;

	•	a shortfall in revenues or earnings compared to securities analysts’ expectations;

	•	changes in analysts’ recommendations or projections; and

	•	announcements of new acquisitions or development projects by us.

The market price of our common stock may fluctuate significantly in the future, and these fluctuations may be unrelated to our performance. General market price declines or market volatility in the future could adversely affect the price of our common stock, and the current market price may not be indicative of future market prices.

A substantial number of shares of our common stock are subject to stock options and our outstanding series of our convertible notes may be converted into shares of common stock. As of September 20, 2004, there were 23,055,674 shares of our common stock underlying vested stock options eligible for sale and there were an additional 40,634,228 shares of our common stock issuable upon conversion of our other outstanding convertible notes (including the convertible debentures held by the trusts that have issued the HIGH TIDES I, II and III). As of September 20, 2004, on an as adjusted basis after giving effect to the issuance of the shares of common stock offered by this prospectus supplement and the contemporaneous offering of convertible notes and the use of the proceeds of that issuance to redeem the outstanding HIGH TIDES I and HIGH TIDES II, there would have been 23,142,023 shares of our common stock underlying vested stock options eligible for sale and an additional 15,904,328 shares of our common stock issuable upon conversion of our outstanding convertible securities. Additional shares of our common stock will be issuable upon the conversion of the convertible notes that are being concurrently offered. See “Concurrent Offering of Convertible Notes.”

We may also decide to raise additional funds through public or private debt or equity financing to fund our operations. If we raise funds by issuing equity securities, the percentage ownership of current stockholders will be reduced and the new equity securities may have rights prior to those of the common stock offered by this prospectus supplement. We cannot predict the effect, if any, that future sales of our common stock, other equity securities or securities convertible into our common stock or other equity securities (including the convertible notes being offered concurrently herewith), or the availability of any of the foregoing for future sale, will have on the market price of our common stock or notes. Sales of substantial amounts of our common stock (including shares issued upon the exercise of stock options or the conversion of any convertible securities outstanding now or in the future), or the perception that such sales could occur, may adversely affect prevailing market prices for our common stock.

The effect of the issuance of our shares of common stock pursuant to the share lending agreement and upon conversion of the convertible notes being offered concurrently, including sales of our common stock in short sale transactions by the purchasers of the convertible notes, may have a negative affect on the market price of our common stock.

We have agreed pursuant to the share lending agreement to lend to DB, as agent for its affiliate Deutsche Bank AG (London), the 89 million shares of our common stock that are being offered pursuant to this prospectus supplement. In addition, we are concurrently offering $600,000,000 aggregate principal amount at maturity ($690 million aggregate principal amount at maturity if DB, the underwriter, exercises in full its over-allotment option) of convertible notes, which may be converted, upon the occurrence of certain contingencies, into cash and shares of our common stock pursuant to a formula which will require that the higher the price of our common stock, the greater the number of shares that would be issuable upon conversion. We have been advised by DB that in connection with the offering of the convertible notes, DB intends to facilitate the establishment by the convertible note investors of hedged positions in the convertible notes through purchases of common stock from such investors in short sale transactions or the entry into privately negotiated derivative transactions with those investors. While issuance of shares upon the conversion of the convertible notes requires a reduction of an equal number in the outstanding borrowed shares under the share lending agreement, the effect of the increase in the number of shares of our common stock issued or issuable pursuant to the share lending agreement or upon conversion of the convertible notes could have a negative affect on the market price of our common stock. The market price of our common stock also could be negatively affected by other short sales of our common stock by the purchasers of the convertible notes to hedge their investment in the convertible notes.

None of the proceeds from the sale of our common stock offered by this prospectus supplement will be received by us.

The following table sets forth, as of June 30, 2004 (i) our actual consolidated capitalization and (ii) our consolidated capitalization, as adjusted to reflect the net effect of (a) the sale of the common stock offered by this prospectus supplement, (b) the concurrent offering of $600 million of convertible notes (which amount does not include the underwriter’s overallotment option) and the use of the proceeds therefrom, (c) the concurrent offering of $785 million of senior secured notes and the use of the proceeds therefrom, (d) the consummation of the sale of certain of our oil and gas assets in New Mexico and Colorado and all of our Canadian natural gas reserves and petroleum assets and the use of the proceeds therefrom as described in “Summary—Recent Developments—Sale of Certain Natural Gas Reserves and Petroleum Assets; Repayment and Reduction of Commitments Under Senior Secured Credit Facility,” (e) the repurchase of $266,225,000 aggregate principal amount of our 4.75% Contingent Convertible Notes due 2023 from DB, (f) the repurchase of certain of our senior notes and HIGH TIDES through September 17, 2004, as described in “Summary—Recent Developments—Repurchases of Our Outstanding Debt.” For more information, see “Use of Proceeds” and “Summary— Recent Developments.”

You should read this table in conjunction with our consolidated financial statements and the notes thereto, “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and other financial information contained in our Annual Report on Form 10-K/ A for the year ended December 31, 2003 and in our Quarterly Report on Form 10-Q for the quarter ended June 30, 2004.


(1)	“Notes payable to Calpine Capital Trusts” constitutes the debentures issued by Calpine to the Calpine Capital Trusts, our wholly owned subsidiaries, in connection with the issuance of the HIGH TIDES by the Calpine Capital Trusts. As of June 30, 2004, the liquidation amount outstanding of the HIGH TIDES was $1,153,500,000 and $132,500,000 in liquidation amount of the HIGH TIDES was held by Calpine. As adjusted to give effect to repurchases of HIGH TIDES through September 17, 2004 and the use of proceeds from our concurrent offering of convertible notes, there will be $517,500,000 in notes payable to Calpine Capital Trusts outstanding and $517,500,000 in liquidation amount of the HIGH TIDES will be outstanding, none of which will be held by Calpine.

(2)	While the shares that we have agreed to loan to an affiliate of DB will be reflected as outstanding in stockholders’ equity, based on current accounting principles, we believe that the shares will not be considered outstanding for the purpose of computing earnings per share.

Our common stock is traded on The New York Stock Exchange under the symbol “CPN.” The following table sets forth, for the periods indicated, the range of high and low sale prices for our common stock:

As of September 20, 2004, there were 2,301 holders of record of our common stock. On September 20, 2004, the last sale price for our common stock reported on The New York Stock Exchange was $3.61 per share.

Concurrently with this offering of common stock, we are offering by means of a separate prospectus supplement $600 million in aggregate principal amount at maturity ($690 million aggregate principal amount at maturity if DB exercises its over-allotment option in full) of our convertible notes in an offering registered under the Securities Act. The convertible notes will be subordinated in right of payment to all of our existing and future secured indebtedness and will rank equally in right of payment with all of our existing and future senior unsecured indebtedness. We intend to use the net proceeds from the offering of the convertible notes to redeem the outstanding 5.75% HIGH TIDES I issued by Calpine Capital Trust and the outstanding 5.50% HIGH TIDES II issued by Calpine Capital Trust II, and for the repayment or repurchase of portions of certain of our other outstanding securities, all in accordance with the terms and provisions of our outstanding indebtedness.

To make the purchase of convertible notes more attractive to prospective investors, we have entered into a share lending agreement, dated September l, 2004, with Deutsche Bank Securities Inc., as agent for its affiliate, Deutsche Bank AG (London), which we refer to as DB London, under which we have agreed to loan to DB London up to 89 million shares of our common stock during a period beginning on the date we entered into the share lending agreement and ending on the tenth anniversary of the agreement or, if earlier, the date as of which the entire principal amount of the convertible notes ceases to be outstanding as the result of conversion, repurchase or redemption, which we refer to as the “loan availability period.” We will receive a loan fee of $.001 per share for each share that we loan to DB London.

Under the agreement, DB London is permitted to use the borrowed shares only for the purpose of directly or indirectly facilitating the sale of the convertible notes and the hedging of the convertible notes by holders.

Share loans under the agreement will terminate and the borrowed shares must be returned to us, under the following circumstances:


	•	DB London may terminate all or any portion of a loan at any time.

	•	We may terminate any or all of the outstanding loans upon a default by DB London under the share lending agreement, including a breach by DB London of any of its representations and warranties, covenants or agreements under the agreement or the bankruptcy of DB London.

	•	If we enter into a merger or similar business combination transaction with an unaffiliated third party, all outstanding loans will terminate immediately prior to the consummation of that transaction.

In addition, to the extent that shares of common stock are issued upon the conversion of the convertible notes, an equal number of shares of common stock simultaneously must be returned. Except in certain limited circumstances, any borrowed shares returned to us cannot be reborrowed.

Any shares that we loan to DB London will be issued and outstanding for corporate law purposes, and accordingly, the holders of the borrowed shares will have all of the rights of a holder of our outstanding shares, including the right to vote the shares on all matters submitted to a vote of our stockholders and the right to receive any dividends or other distributions that


	•	to pay to us an amount equal to any cash dividends that we pay on the borrowed shares, and

	•	to pay or deliver to us any other distribution, in liquidation or otherwise, that we make on the borrowed shares.

Under the share lending agreement, DB London has agreed to post and maintain with Deutsche Bank Securities Inc., acting as collateral agent on our behalf, collateral in the form of cash, government securities, certificates of deposit, high-grade commercial paper of U.S. issuers or money market shares with a market value at least equal to 100% of the market value of the borrowed shares as security for the obligation of DB London to return the borrowed shares of common stock to us when required under the terms of the share lending agreement. In certain limited circumstances, primarily if DB London is prohibited by law or court order from returning the borrowed shares, we may elect to receive a distribution of the posted collateral in lieu of the delivery of the shares.

In view of the contractual undertakings of DB in the share lending agreement, which have the effect of substantially eliminating the economic dilution that otherwise would result from the issuance of the borrowed shares, we believe that under U.S. generally accepted accounting principles currently in effect, the borrowed shares will not be considered outstanding for the purpose of computing and reporting our earnings per share.

DB London is offering for sale pursuant to this prospectus supplement the entire 89 million shares it is entitled to borrow under the share lending agreement. We have been advised by DB London that it intends to use the proceeds from the sale of these shares to facilitate the establishment by the convertible note investors of hedged positions in the convertible notes through purchases of common stock from such investors in short sale transactions or the entry into privately negotiated derivative transactions with those investors.

The existence of the share lending agreement and the short positions established in connection with the sale of the convertible notes could have the effect of causing the market price of our common stock to be lower over the term of the share lending agreement than it would have been had we not entered into the agreement. However, our board of directors has determined that the entry into the share lending agreement is in our best interests as it is a means to facilitate the offer and sale of the convertible notes on terms more favorable to us than we could have otherwise obtained.

Our authorized capital stock consists of 2,000,000,000 shares of common stock, $.001 par value, and 10,000,000 shares of preferred stock, $.001 par value. The following summary is qualified in its entirety by the provisions of our amended and restated certificate of incorporation and by-laws, which have been included or incorporated by reference as exhibits to our Quarterly Report on Form 10-Q for the quarter ended June 30, 2004, which is incorporated by reference in this prospectus supplement.

As of September 20, 2004, there were 445,020,678 shares of common stock outstanding. In addition, as of September 20, 2004, there were 23,055,674 shares of our common stock underlying vested stock options eligible for sale and there were an additional 40,634,228 shares of our common stock issuable upon conversion of our outstanding convertible notes (including the convertible debentures held by the trusts that have issued the HIGH TIDES I, II and III). As of September 20, 2004, on an as adjusted basis after giving effect to the issuance of the shares of common stock offered by this prospectus supplement and the contemporaneous offering of convertible notes and the use of the proceeds of that issuance to redeem the outstanding HIGH TIDES I and HIGH TIDES II, there would have been 534,020,678 shares of our common stock outstanding, 23,142,023 shares of our common stock underlying vested stock options eligible for sale, and an additional 15,904,328 shares of our common stock issuable upon conversion of our outstanding convertible securities. The holders of all outstanding shares of common stock are entitled to one vote per share on all matters to be voted upon by the stockholders. Subject to preferences that may be applicable to any outstanding preferred stock, the holders of common stock are entitled to receive ratably such dividends, if any, as may be declared from time to time by the board of directors out of legally available funds. See “—Dividend Policy,” below. In the event of our liquidation, dissolution or winding up, the holders of common stock are entitled to share ratably in all assets remaining after payment of liabilities, subject to prior liquidation rights of preferred stock, if any, then outstanding. The common stock has no preemptive or conversion rights or other subscription rights. There are no redemption or sinking fund provisions applicable to the common stock. Pursuant to a rights agreement entered into in June 1997, as amended, our shares of common stock outstanding prior to the occurrence of events specified in the rights agreement have certain preferred share purchase rights, which are set forth in more detail in the rights agreement incorporated by reference as an exhibit to Calpine’s Annual Report on Form 10-K/A for the year ended December 31, 2003, which is incorporated by reference in this prospectus supplement. See “—Anti-Takeover Effects of Provisions of the Certificate of Incorporation, Bylaws and Delaware Law—Rights Plan,” below.

We have not declared any cash dividends on our common stock during the past two fiscal years. We do not anticipate paying any cash dividends on our common stock in the foreseeable future because we intend to retain our earnings to finance the expansion of our business and for general corporate purposes. In addition, our ability to pay cash dividends is restricted under certain of our indentures and our other debt agreements. Future cash dividends, if any, will be at the discretion of our board of directors and will depend upon, among other things, our future operations and earnings, capital requirements, general financial condition, contractual restrictions and such other factors as the board of directors may deem relevant.

As of September 20, 2004, there were no shares of our preferred stock outstanding. Our board of directors has the authority, without further vote or action by the stockholders, to issue

from time to time up to 10,000,000 shares of preferred stock in one or more series, and to fix the rights, preferences, privileges, qualifications, limitations and restrictions granted to or imposed upon any wholly unissued shares of undesignated preferred stock, including without limitation dividend rights, if any, voting rights, if any, and liquidation and conversion rights, if any. Our board of directors has the authority to fix the number of shares constituting any series and the designations of such series without any further vote or action by the stockholders. Our board of directors, without stockholder approval, can issue preferred stock with voting and conversion rights, which could adversely affect the voting power of the holders of common stock. The issuance of preferred stock may have the effect of delaying, deferring or preventing a change in control of Calpine, or could delay or prevent a transaction that might otherwise give our stockholders an opportunity to realize a premium over the then-prevailing market price of the common stock.

Our board of directors has authorized the issuance of up to 1,000,000 shares of Series A Participating Preferred Stock, par value $.001 per share, pursuant to a rights plan adopted by our board of directors on June 5, 1997, which was amended on September 19, 2001 and September l, 2004. As of September 20, 2004, no shares of our participating preferred stock were outstanding. A description of the rights plan and the participating preferred stock is set forth under “—Anti-Takeover Effects of Provisions of Certificate of Incorporation, Bylaws and Delaware Law— Rights Plan,” below.

Anti-Takeover Effects of Provisions of the Certificate of Incorporation, Bylaws and Delaware Law

Our amended and restated certificate of incorporation and bylaws provide that our board of directors is classified into three classes of directors serving staggered, three-year terms. The certificate of incorporation also provides that directors may be removed only by the affirmative vote of the holders of two-thirds of the shares of our capital stock entitled to vote. Any vacancy on the board of directors may be filled only by vote of the majority of directors then in office. Further, the certificate of incorporation provides that any business combination (as therein defined) requires the affirmative vote of the holders of two-thirds of the shares of our capital stock entitled to vote, voting together as a single class. The certificate of incorporation also provides that all stockholder actions must be effected at a duly called meeting and not by a written consent. Our certificate of incorporation provides that a special meeting of stockholders may be called only by the chairman of our board of directors, or by the chairman or secretary upon the written request of a majority of the total number of directors we would have if there were no vacancies on our board of directors. The provisions of the certificate of incorporation and bylaws could discourage potential acquisition proposals and could delay or prevent a change in control of Calpine. These provisions are intended to enhance the likelihood of continuity and stability in the composition of the board of directors and in the policies formulated by the board of directors and to discourage certain types of transactions that may involve an actual or threatened change of control of Calpine. These provisions are designed to reduce our vulnerability to an unsolicited acquisition proposal. The provisions also are intended to discourage certain tactics that may be used in proxy fights. However, such provisions could have the effect of discouraging others from making tender offers for our shares and, as a consequence, they also may inhibit fluctuations in the market price of our shares that could result from actual or rumored takeover attempts. Such provisions also may have the effect of preventing changes in our management.

On June 5, 1997, we adopted a stockholders’ rights plan to strengthen our ability to protect our stockholders. The rights plan was amended on September 19, 2001 and on

September l, 2004. The rights plan is designed to protect against abusive or coercive takeover tactics that are not in the best interests of Calpine or its stockholders. To implement the rights plan, we declared a dividend of one preferred share purchase right for each outstanding share of our common stock held of record as of June 18, 1997, and directed the issuance of one preferred share purchase right with respect to each share of our common stock that shall become outstanding thereafter until the rights become exercisable or they expire as described below. Each right initially represents a contingent right to purchase, under certain circumstances, one one-thousandth of a share, called a “unit,” of our Series A Participating Preferred Stock, par value $.001 per share, at a price of $140.00 per unit, subject to adjustment. The rights will become exercisable and trade independently from our common stock upon the public announcement of the acquisition by a person or group of 15% or more of our common stock, or ten days after commencement of a tender or exchange offer that would result in the acquisition of 15% or more of our common stock. Each unit purchased upon exercise of the rights will be entitled to a dividend equal to any dividend declared per share of common stock and will have one vote, voting together with the common stock. In the event of our liquidation, each unit purchased upon exercise of the rights will be entitled to any payment made per share of common stock.

If we are acquired in a merger or other business combination transaction after a person or group has acquired 15% or more of our common stock, each right will entitle its holder to purchase at the right’s exercise price a number of the acquiring company’s shares of common stock having a market value of twice the right’s exercise price. In addition, if a person or group acquires 15% or more of our common stock, each right will entitle its holder (other than the acquiring person or group) to purchase, at the right’s exercise price, a number of fractional shares of our participating preferred stock or shares of our common stock having a market value of twice the right’s exercise price.

The rights remain exercisable for up to 90 days following a triggering event (such as a person acquiring 15% or more of our common stock). The rights expire on June 18, 2007, unless redeemed earlier by us. We can redeem the rights at a price of $.01 per right at any time before the rights become exercisable, and thereafter only in limited circumstances.

In connection with our entry into the share lending agreement with DB, we have amended the stockholders’ rights plan to exclude the shares that DB is entitled to borrow under the share lending agreement in determining whether DB or any of its affiliates owns more than 15% or more of our common stock. However, this exclusion does not extend to any person or group that acquires the borrowed shares directly or indirectly from DB.

We are subject to Section 203 of the General Corporation Law of the State of Delaware (“Section 203”), which, subject to certain exceptions, prohibits a Delaware corporation from engaging in any business combination with any interested stockholder for a period of three years following the time that such stockholder became an interested stockholder, unless: (1) prior to such time, the board of directors of the corporation approved either the business combination or the transaction that resulted in the stockholder becoming an interested stockholder; (2) upon consummation of the transaction that resulted in the stockholder becoming an interested stockholder, the interested stockholder owned at least 85% of the voting stock of the corporation outstanding at the time the transaction commenced, excluding for purposes of determining the voting stock outstanding (but not the outstanding voting stock owned by the interested stockholder) those shares owned (x) by persons who are directors and also officers and (y) by employee stock plans in which employee participants do not have the right to determine confidentially whether shares held subject to the plan will be tendered in

a tender or exchange offer; or (3) on or subsequent to such time, the business combination is approved by the board of directors and authorized at an annual or special meeting of stockholders, and not by written consent, by the affirmative vote of at least 66 2/3% of the outstanding voting stock that is not owned by the interested stockholder. In connection with our entry into the share lending agreement with DB, our board of directors has approved the transactions between us and DB under the agreement for purposes of Section 203.

Section 203 defines the term business combination to include: (1) any merger or consolidation involving the corporation or any of its direct or indirect majority-owned subsidiaries and the interested stockholder; (2) any sale, transfer, pledge or other disposition of 10% or more of the assets of the corporation or any of its direct or indirect majority-owned subsidiaries involving the interested stockholder; (3) subject to certain exceptions, any transaction that results in the issuance or transfer by the corporation of any stock of the corporation or any of its direct or indirect majority-owned subsidiaries of any stock of the corporation or that subsidiary to the interested stockholder; (4) any transaction involving the corporation or any of its direct or indirect majority-owned subsidiaries that has the effect of increasing the proportionate share of the stock of any class or series of the corporation or that subsidiary beneficially owned by the interested stockholder; or (5) the receipt by the interested stockholder of the benefit of any loans, advances, guarantees, pledges or other financial benefit provided by or through the corporation or any of its direct or indirect majority-owned subsidiaries. In general, Section 203 defines an interested stockholder as any entity or person beneficially owning 15% or more of the outstanding voting stock of the corporation and any entity or person affiliated with or controlling or controlled by such entity or person.

The shares of our common stock offered by this prospectus supplement are shares that we have agreed to loan to Deutsche Bank AG (London), or DB London, an affiliate of DB, pursuant to the share lending agreement. DB also is the underwriter on a firm commitment basis for the concurrent offering by means of a separate prospectus supplement of $600 million ($690 million including the exercise of DB’s over-allotment option) in principal amount at maturity of our convertible notes. See “Concurrent Offering of Convertible Notes.” DB London is offering for sale pursuant to this prospectus supplement the entire 89 million shares it is entitled to borrow under the share lending agreement. We have been advised by DB London that it intends to use the proceeds from the sale of these shares to facilitate the establishment by the convertible note investors of hedged positions in the convertible notes through purchases of common stock from such investors in short sale transactions or the entry into privately negotiated derivative transactions with those investors. See “Concurrent Offering of Convertible Notes” above. In connection with certain market activities of DB relating to other securities of ours, including the 4.75% Contingent Convertible Notes due 2023 and the common stock offered hereby, DB or one or more of its affiliates may purchase a portion of the aggregate principal amount of the convertible notes. We will not receive any proceeds from the sale of shares of our common stock pursuant to this prospectus supplement.

The underwriter proposes to offer the shares of our common stock initially at the public offering price on the cover page of this prospectus supplement. The underwriter may allow a discount of $l per share on sales to other broker/ dealers. After the initial public offering, the underwriter may change the public offering price and concession and discount to broker- dealers.

The following table summarizes the compensation and estimated expenses we will pay.

In the ordinary course of business, the underwriter and its affiliates have provided financial advisory, investment banking and general financing and banking services for us and our affiliates for customary fees. DB acted as sole arranger in the $82.8 million contract monetization, dated as of May 15, 2003, of the existing power sales agreement between Northbrook Energy Marketing, LLC, a subsidiary of Calpine, and Bonneville Power Administration. We have agreed to purchase from DB or an affiliate of DB following completion of this offering, $266,225,000 million in aggregate principal amount of our outstanding 4.75% Contingent Convertible Notes.

We have agreed to indemnify the underwriter against liabilities under the Securities Act, or contribute to payments which the underwriter may be required to make in that respect.

In connection with this offering, the underwriter may engage in stabilizing transactions, over-allotment transactions, syndicate-covering transactions and penalty bids in accordance with Regulation M under the Securities Exchange Act of 1934.


	•	Stabilizing transactions permit bids to purchase the underlying security so long as the stabilizing bids do not exceed a specified maximum.

	•	Over-allotment involves sales by the underwriters of shares in excess of the number of shares the underwriters are obligated to purchase, which creates a syndicate short position. The short position may be either a covered short position or a naked short position. In a covered short position, the number of shares over-allotted by the underwriters is not greater than the number of shares that they may purchase in the over-allotment option. In a naked short position, the number of shares involved is greater than the number of shares in the over-allotment option. The underwriters may close out


		any short position by either exercising their over-allotment option and/or purchasing shares in the open market.

	•	Syndicate-covering transactions involve purchases of the common stock in the open market after the distribution has been completed in order to cover syndicate short positions. In determining the source of shares to close out the short position, the underwriters will consider, among other things, the price of shares available for purchase in the open market as compared to the price at which they may purchase shares through the over-allotment option. If the underwriters sell more shares than could be covered by the over-allotment option, a naked short position, the position can only be closed out by buying shares in the open market. A naked short position is more likely to be created if the underwriters are concerned that there could be downward pressure on the price of the shares in the open market after pricing that could adversely affect investors who purchase in the offering.

	•	Penalty bids permit the representatives to reclaim a selling concession from a syndicate member when the common stock originally sold by the syndicate member is purchased in a stabilizing or syndicate covering transaction to cover syndicate short positions.

These stabilizing transactions, syndicate covering transactions and penalty bids may have the effect of raising or maintaining the market price of the common stock or preventing or retarding a decline in the market price of the common stock. As a result, the price of the common stock may be higher than the price that might otherwise exist in the open market. These transactions may be effected on The New York Stock Exchange or otherwise and, if commenced, may be discontinued at any time.

A prospectus in electronic format may be made available on the websites maintained by the underwriter, if any, participating in this offering. Internet distributions will be allocated by the underwriters that will make Internet distributions on the same basis as other allocations.

The validity of the securities offered hereby will be passed upon for us by Covington & Burling, New York, New York. The underwriter has been represented by Davis Polk & Wardwell, New York, New York, and by Latham & Watkins LLP, New York, New York. Latham & Watkins LLP has in the past performed, and may from time to time in the future perform, work for Calpine and related entities. In particular, Latham & Watkins LLP acted as independent counsel to the audit committee of Calpine’s board of directors in connection with the restatement of Calpine’s 2001 and 2002 financial statements and the related amendment to its Annual Report on Form 10-K for the fiscal year ended December 31, 2002.

The consolidated financial statements of Calpine Corporation as of and for the year ended December 31, 2003, incorporated in this prospectus by reference to Calpine Corporation’s Annual Report on Form 10-K/ A for the year ended December 31, 2003, have been so incorporated in reliance on the report of PricewaterhouseCoopers LLP, an independent registered public accounting firm, given on the authority of said firm as experts in auditing and accounting.

The 2002 and 2001 consolidated financial statements and related financial statement schedules of Calpine Corporation incorporated by reference in this prospectus from Calpine Corporation’s Annual Report on Form 10-K/ A Amendment No. 2 for the year ended December 31, 2003 have been audited by Deloitte & Touche LLP, an independent registered public accounting firm, as stated in their report, which is incorporated herein by reference (which report expresses an unqualified opinion and includes emphasis relating to the adoption of new accounting standards in 2002 and 2001 and divestitures), and have been so incorporated in reliance upon the report of such firm given upon their authority as experts in accounting and auditing.

We file annual, quarterly and special reports, proxy statements and other information with the Securities and Exchange Commission, or SEC. You may read and copy any document we file at the SEC’s public reference room in Washington, D.C. Please call the SEC at 1-888-SEC-0330 for further information on the public reference room. Our SEC filings are also available to the public from the SEC’s web site at www.sec.gov or through Calpine’s Web site at www.calpine.com. However, the information on these web sites does not constitute a part of this prospectus supplement.

You should rely only upon the information provided, or incorporated by reference, in this prospectus supplement. We have not authorized anyone to provide you with different information. You should not assume that the information in this prospectus supplement is accurate as of any date other than the dates specified in this prospectus supplement.

The SEC permits us to “incorporate by reference” into this prospectus supplement the information in documents we file with it, which means that we can disclose important information to you by referring you to those documents. The information incorporated by reference is considered to be a part of this prospectus supplement and later information that we file with the SEC will automatically update and supersede this information. In addition to the documents incorporated by reference in the prospectus, listed on page 8 in the prospectus under “Where You Can Find More Information; Documents Incorporated by Reference,” we incorporate by reference the future filings with the SEC under Sections 13(a), 13(c), 14

If you request a copy of any or all of the documents incorporated by reference, then we will send to you the copies you requested at no charge. However, we will not send exhibits to such documents, unless such exhibits are specifically incorporated by reference in such documents. You should direct requests for such copies either by writing to Calpine Corporation, 50 West San Fernando Street, San Jose, California 95113, attention: Lisa M. Bodensteiner, General Secretary, or by telephoning (408) 995-5115.

We have filed with the SEC a registration statement on Form S-3 under the Securities Act of 1933, as amended, covering the securities described in this prospectus supplement. This prospectus supplement does not contain all of the information included in the registration statement. Any statement made in this prospectus supplement concerning the contents of any contract, agreement or other document is only a summary of the actual contract, agreement or other document. If we have filed any contract, agreement or other document as an exhibit to the registration statement, you should read the exhibit for a more complete understanding of the document or matter involved. Each statement regarding a contract, agreement or other document is qualified in its entirety by reference to the actual document. Copies of documents described herein are available free of charge upon request as provided in the preceding paragraph.

We may offer any combination of the securities described in this prospectus in different series from time to time in amounts, at prices and on terms to be determined at or prior to the time of the offering. We will provide you with specific terms of the applicable offered securities in one or more supplements to this prospectus. The aggregate initial offering price of the securities that we may issue under this prospectus will not exceed $2,500,000,000.

We urge you to read this prospectus and any accompanying prospectus supplement carefully before you make your investment decision. This prospectus may not be used to make sales of the offered securities unless it is accompanied by a prospectus supplement describing the method and terms of the offering of those offered securities. We may sell the securities or we may distribute them through underwriters or dealers. In addition, the underwriters may overallot a portion of the securities.

Calpine Corporation’s common stock is traded on The New York Stock Exchange under the symbol “CPN.” Unless we state otherwise in a prospectus supplement, we will not list any other of these securities on any securities exchange or on the Nasdaq Stock Market.

Investing in these securities involves certain risks. See “Risk Factors” on page 8.

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or determined if this prospectus is truthful or complete. Any representation to the contrary is a criminal offense.

No person is authorized to give any information or to make any representations other than those contained or incorporated by reference in this prospectus or the accompanying prospectus supplement and, if given or made, such information or representations must not be relied upon as having been authorized. This prospectus and accompanying prospectus supplement do not constitute an offer to sell or the solicitation of an offer to buy any securities other than the securities described in this prospectus and the accompanying prospectus supplement or an offer to sell or the solicitation of an offer to buy such securities in any circumstance in which such offer or solicitation is unlawful. Neither the delivery of this prospectus or the accompanying prospectus supplement, nor any sale made under this prospectus or accompanying prospectus supplement shall, under any circumstances, create any implication that there has been no change in our affairs since the date of the prospectus supplement accompanying this prospectus or that the information contained or incorporated by reference in this prospectus or accompanying prospectus supplement is correct as of any time subsequent to the date of such information.

This prospectus is part of a joint registration statement that Calpine Corporation, Calpine Canada Energy Finance ULC, Calpine Canada Energy Finance II ULC, Calpine Capital Trust IV and Calpine Capital Trust V filed with the Securities and Exchange Commission (the “SEC”) using a “shelf” registration, or continuous offering, process. Under this shelf process, we may sell, from time to time, any combination of the securities described in this prospectus in one or more offerings up to a total dollar amount of $2,500,000,000, which amount includes over-allotment options with regard to certain securities.

Pursuant to Rule 3-10 of Regulation S-X promulgated by the SEC, we are not required to include in this prospectus separate financial statements of Calpine Canada Energy Finance ULC, which we refer to as “Energy Finance,” Calpine Canada Energy Finance II ULC, which we refer to as “Energy Finance II,” Calpine Capital Trust IV, which we refer to as “Trust IV,” or Calpine Capital Trust V, which we refer to as “Trust V,” because:


	•	in the case of Energy Finance and Energy Finance II, all of each of their respective voting rights are owned by Calpine Corporation (which we refer to as “Calpine”), either directly or indirectly;

	•	in the case of Trust IV and Trust V, the sum of all of each of their respective interests are owned by Calpine, either directly or through wholly-owned subsidiaries of Calpine, other than (i) securities that are guaranteed by Calpine and, if applicable, other 100%-owned subsidiaries of Calpine and (ii) securities that guarantee securities issued by Calpine and, if applicable, other 100% owned subsidiaries of Calpine;

	•	Calpine files periodic and other reports with the SEC pursuant to the Securities Exchange Act of 1934, as amended (the “Securities Exchange Act”);

	•	none of Energy Finance, Energy Finance II, Trust IV or Trust V has operations other than the investment of funds in Calpine or its subsidiaries; and

	•	Calpine will fully and unconditionally guarantee the obligations of Energy Finance, Energy Finance II, Trust IV and Trust V, and the rights of holders of their securities, and no subsidiary of Calpine will guarantee those obligations.

Because Energy Finance, Energy Finance II, Trust IV and Trust V are permitted to omit financial statements, pursuant to Rule 12h-5 under the Securities Exchange Act, they are not subject to the information reporting requirements of that Act.

This prospectus provides you with a general description of the securities we may offer. Each time we sell such securities, we will provide a prospectus supplement containing specific information about the terms of the securities being offered, including any guarantees, and if we sell securities through agents, underwriters or dealers, the names of such agents, underwriters or dealers and any fees, discounts and commissions to be paid to them. That prospectus supplement may include a discussion of any risk factors or other special considerations applicable to those securities. The prospectus supplement may also add, update or change information in this prospectus. If there is any inconsistency between the information in this prospectus and any prospectus supplement, you should rely on the information in that prospectus supplement. You should read both this prospectus and any prospectus supplement together with the additional information described under the heading “Where You Can Find More Information; Documents Incorporated by Reference.”

The registration statement containing this prospectus, including the exhibits to the registration statement, provides additional information about us and the securities offered under this prospectus. The registration statement, including the exhibits, can be read at the SEC website or at the SEC offices mentioned under the heading “Where You Can Find More Information; Documents Incorporated by Reference.” Additional documents that contain the specific terms of certain securities we may offer may subsequently be filed as exhibits to this registration statement or incorporated into the prospectus or prospectus supplement by reference to documents we file with the SEC.

The prospectus also incorporates business and financial information about us that is not included or delivered with this document. You may request and obtain this information free of charge by writing to us at Calpine Corporation, 50 West San Fernando Street, San Jose, California 95113, attention: Lisa M. Bodensteiner, Assistant Secretary, or by telephoning us at (408) 995-5115.

You should rely only on the information provided or incorporated by reference in this prospectus and the accompanying prospectus supplement. We have not authorized anyone to provide you with different information. We are not making an offer or soliciting a purchase of these securities in any jurisdiction in which the offer or solicitation is not authorized or in which the person making the offer or solicitation is not qualified to do so or to anyone to whom it is unlawful to make the offer or solicitation. You should assume that the information in this prospectus or the accompanying prospectus supplement is accurate only as of the date on the front of the document and that any information incorporated by reference is accurate only as of the date of the document incorporated by reference.

Unless we have indicated otherwise, in this prospectus references to “Calpine” are to Calpine Corporation, references to “Energy Finance” are to Calpine Canada Energy Finance ULC, references to “Energy Finance II” are to Calpine Canada Energy Finance II ULC, references to “Trust IV” are to Calpine Capital Trust IV, references to “Trust V” are to Calpine Capital Trust V, references to “the trusts” are, collectively, to Trust IV and Trust V, and references to “we,” “us” and “our” or similar terms are, collectively, to Calpine Corporation and its consolidated subsidiaries. Unless otherwise indicated, references in this prospectus to “$” or “dollar” are to the lawful currency of the United States.

We are a San Jose, California based power company engaged in the development, construction, ownership and operation of power generation facilities and the sale of electricity, predominantly in the United States, but also in Canada and the United Kingdom. We were established as a corporation in 1984. We focus on two efficient and clean types of power generation technologies: natural gas-fired combustion turbine and geothermal. We currently lease and operate a significant fleet of geothermal power plants at The Geysers, and have increased our operating portfolio of clean burning natural gas power plants by 17,502 megawatts, or MW, over the past three years.

Natural Gas Assets. We have in place an experienced gas production management team that manages nearly 472 billion cubic feet equivalent, or Bcfe, of proved gas reserves, after giving effect to our recent sales of certain of our gas reserves. These reserves are located in California, South Texas and Gulf Coast regions, all of which are major oil and gas producing regions in North America. Approximately 96% of our North American proved reserves are natural gas. In addition to our ability to produce over 120 million cubic feet equivalent, or MMcfe, of natural gas per day, we own or control approximately 257,000 net undeveloped acres that are available for future exploration or drilling activity. For more information about our recent sales of certain of our gas reserves see “— Recent Developments.”

Calpine Energy Services L.P. Our wholly-owned subsidiary, Calpine Energy Services L.P., or CES, provides the trading and risk management services needed to schedule our power sales and to make sure fuel is delivered to our power plants on time to meet delivery requirements and to optimize the value of our power and gas assets.

Complementing CES’s activities, we have recently reorganized our sales and marketing organization to better meet the needs of our growing list of wholesale and large retail customers. We focus our sales activities on load serving entities such as local utilities, municipalities and cooperatives, as well as on large-scale end users such as industrial and commercial companies. As a general goal, we seek to have 65% of our available capacity sold under long-term contracts or hedged by our risk management group.

The electric power industry represents one of the largest industries in the United States and impacts nearly every aspect of our economy, with an estimated end-user market of nearly $260 billion of electricity sales in 2003 based on information published by the Energy Information Administration of the Department of Energy. Historically, the power generation industry has been largely characterized by electric utility monopolies producing electricity from old, inefficient, high-cost generating facilities selling to a captive customer base. However, industry trends and regulatory initiatives have transformed some markets into more competitive grounds where load-serving entities and end-users may purchase electricity from a variety of suppliers, including independent power producers, power marketers, regulated public utilities and others. For the past decade, the power industry has been deregulated at the wholesale level allowing generators to sell directly to the load-serving entities, such as public utilities, municipalities and electric cooperatives. Although industry trends and regulatory initiatives aimed at further deregulation have slowed, the power industry continues to transform into a more competitive market.

Based on strength in residential and commercial demand, overall consumption of electricity was estimated to have grown by approximately 2.9% in 2004 through February compared to the same period in 2003, according to Edison Electric Institute published data. The growth rate for calendar year 2003 was 1.8%. The growth rate in supply is diminishing with many developers canceling, or delaying completion of their projects as a result of current market conditions. The supply and demand balance in the natural gas industry continues to be strained with gas prices rising to over $6.40 per million British thermal units, or MMbtu, in the first quarter of 2004, compared to an average of approximately $5.50 per MMbtu in 2003 and $3.00 per MMbtu in 2002. Overall, we expect the market to continue to work through the current oversupply of power in several regions within the next few years. As the supply-demand dynamics improve, we expect to see spark spreads improve.

$360 Million Preferred Equity Offering. On September 17, 2004, we announced that Calpine (Jersey) Limited, a new company being formed as our indirect, wholly owned subsidiary, intends to commence an offering of $360 million of two-year redeemable preferred shares in a private placement transaction under Regulation D and Regulation S of the Securities Act. The offering is subject to the receipt of certain regulatory approvals. We intend to initially loan the proceeds of the offering to our 1,200 MW Saltend cogeneration power plant located in Hull, Yorkshire, England, and the payments of principal and interest on the loan will fund payments on the redeemable preferred shares. The net proceeds of the offering will ultimately be used as permitted by the terms of our outstanding debt securities.

Sale of Certain Natural Gas Reserves and Petroleum Assets; Repayment and Reduction of Commitments Under Senior Secured Credit Facility. On September 1, 2004, we completed the sale of all of our right, title and interest in our oil and gas properties and associated assets in New Mexico and Colorado (except for the Kitzmiller property of Calpine Natural Gas L.P. located in the northwest part of Colorado, which was retained), including our leases, minerals, overrides, easements, wells, contracts, and personal property. These New Mexico and Colorado properties were sold, effective July 1, 2004, to two U.S. gas companies for

approximately $140 million and approximately $83 million, respectively, subject, in each case, to certain post-closing adjustments, including for certain title defects claimed by the purchasers. Such properties and assets represent approximately 120 Bcfe of proved reserves, producing approximately 16.3 MMcfe of net gas per day.

All of the proceeds from the U.S. gas asset sales and a portion of the proceeds from the Canadian gas sales were used to repay all amounts outstanding under our existing senior secured credit facility and to terminate the revolving commitments thereunder. A portion of the proceeds from the Canadian gas asset sale was also used to cash collateralize $144.8 million of letters of credit outstanding under that agreement. Remaining proceeds from the Canadian gas asset sale will be used in accordance with the asset sale provisions of our existing bond indentures. Following the repayment of our existing secured credit facility, we expect to issue new secured first priority lien debt that will rank senior to our other outstanding secured debt.

Letter of Credit Facility of Calpine Energy Management L.P. On August 5, 2004, our indirect wholly-owned subsidiary, Calpine Energy Management L.P., entered into a $250.0 million letter of credit facility with Deutsche Bank (rated Aa3/AA-) that expires in October 2005. Deutsche Bank will guarantee Calpine Energy Management L.P.’s power and gas obligations by issuing letters of credit under the facility. Receivables generated through power sales will serve as collateral to support the letters of credit. Calpine Energy Management L.P. was created to facilitate short-term gas and power purchases and sales transactions ranging from the hourly market up to one month forward.

Calpine’s principal executive offices are located at 50 West San Fernando Street, San Jose, California 95113. Our telephone number is (408) 995-5115, and our home page on the world wide web is at http://www.calpine.com. The contents of our website are not part of this prospectus.

Energy Finance is an unlimited liability company organized in March 2001 under the laws of Nova Scotia, Canada. Energy Finance II is an unlimited liability company organized in July 2001 under the laws of Nova Scotia, Canada. Energy Finance’s direct parent company is Quintana Canada Holdings, LLC, a Delaware limited liability company. Energy Finance II’s direct parent company is Calpine Canada Resources Ltd., an Alberta, Canada corporation.

Energy Finance and Energy Finance II are both indirect, wholly-owned special purpose finance subsidiaries of Calpine that engage in financing activities to raise funds for the business operations of Calpine and its subsidiaries. They will each issue debt securities and warrants to purchase debt securities. Their debt securities will be fully and unconditionally guaranteed by Calpine.

For the reasons set forth under the caption “About this Prospectus,” we are not required to include separate financial statements of Energy Finance or Energy Finance II in this prospectus and neither entity is subject to the information reporting requirements of the Securities Exchange Act.

The registered office of each of Energy Finance and Energy Finance II is Suite 800, Purdy’s Wharf, Tower 1, 1959 Upper Water Street, P.O. Box 997, Halifax, Nova Scotia B3J 3N2, and their telephone number at that address is (902) 420-3335.

Each of Trust IV and Trust V is a Delaware business trust created under the Delaware Business Trust Act. Each of the trusts will be governed by a declaration of trust (as it may be amended and restated from time to time) among the trustees of each trust and Calpine. Each declaration will be qualified under the Trust Indenture Act of 1939.

For the reasons set forth under the caption “About this Prospectus,” we are not required to include separate financial statements of Trust IV or Trust V in this prospectus and neither entity is subject to the information reporting requirements of the Securities Exchange Act.

Each of the trusts will exist primarily for the purposes of (i) issuing its trust preferred and trust common securities; (ii) investing the proceeds from the sale of its securities in Calpine’s debt securities; and (iii) engaging in only such other activities as are necessary or incidental to issuing its securities and purchasing and holding Calpine’s debt securities.

When a trust issues its trust preferred securities, you and the other holders of the trust preferred securities will own all of the issued and outstanding trust preferred securities of the trust. Calpine will acquire all of the issued and outstanding trust common securities of each trust, representing an undivided beneficial interest in the assets of each trust of at least 3%. Wilmington Trust Company, acting in its capacity as guarantee trustee, will hold for your benefit a trust preferred securities guarantee issued by Calpine, which will be separately qualified under the Trust Indenture Act of 1939.

Each of the trusts will initially have three trustees. One of the trustees will be an individual who is an officer or employee of Calpine. The second trustee will be Wilmington Trust Company, which will serve as the property trustee under the declaration of trust for purposes of the Trust Indenture Act of 1939. The third trustee will be Wilmington Trust Company, which will serve as Delaware trustee and has its principal place of business in the State of Delaware.

Unless otherwise provided in the applicable prospectus supplement, because Calpine will own all of the trust common securities of each trust, Calpine will have the exclusive right to appoint, remove or replace trustees and to increase or decrease the number of trustees. In most cases, there will be at least three trustees. The term of a trust will be described in the applicable prospectus supplement, but may dissolve earlier as provided in the applicable declaration of trust.

The rights of the holders of the trust preferred securities of a trust, including economic rights, rights to information and voting rights, and the duties and obligations of the trustees of a trust, will be contained in and governed by the declaration of trust of that trust (as it may be amended and restated from time to time), the Delaware Business Trust Act and the Trust Indenture Act of 1939.

The address of each trust is 50 West San Fernando Street, San Jose, California 95113, and the telephone number of each trust at that address is (408) 995-5115.

Investing in our securities involves risk. Please see the risk factors described in the Second Amendment to our Annual Report on Form 10-K/ A for the year ended December 31, 2003, filed with the SEC on September 22, 2004 (referred to herein as our Annual Report on Form 10-K/A for the year ended December 31, 2003) which is incorporated by reference in this prospectus. Any of such risks could materially adversely affect our business, financial condition or results of operations. Before making an investment decision, you should carefully consider these risks as well as other information contained or incorporated by reference in this prospectus. You could lose all or part of your investment if any of the risks and uncertainties described actually occur.

Calpine files annual, quarterly and special reports, proxy statements and other information with the SEC. You may obtain any document we file with the SEC at the SEC’s public reference room in Washington, D.C., Chicago, Illinois and New York, New York. You may obtain information on the operation of the SEC’s public reference facilities by calling the SEC at 1-800-SEC-0330. You can request copies of these documents, upon payment of a duplicating fee, by writing to the SEC at its principal office at 450 Fifth Street, N.W., Washington, D.C. 20549-1004. Our SEC filings are also accessible through the Internet at the SEC’s website at http://www.sec.gov.

None of Energy Finance, Energy Finance II, Trust IV or Trust V is currently subject to the information reporting requirements of the Securities Exchange Act, for the reasons set forth under the caption “About this Prospectus.”

The SEC permits us to “incorporate by reference” into this prospectus the information in documents we file with it, which means that we can disclose important information to you by referring you to those documents. The information incorporated by reference is considered to be a part of this prospectus and later information that we file with the SEC will automatically update and supersede this information. This prospectus incorporates by reference:


	•	the Second Amendment to our Annual Report on Form 10-K/ A for the year ended December 31, 2003;

	•	our Quarterly Report on Form 10-Q/ A for the quarter ended March 31, 2004;

	•	our Quarterly Report on Form 10-Q for the quarter ended June 30, 2004;

	•	our Current Reports on Form 8-K filed with the SEC on January 6, 2004, January 9, 2004, January 9, 2004, January 20, 2004, January 29, 2004, February 3, 2004, February 4, 2004, February 9, 2004, February 24, 2004, February 24, 2004, March 10, 2004, March 12, 2004, March 16, 2004, March 23, 2004, April 19, 2004, April 28, 2004, May 27, 2004, June 9, 2004, June 15, 2004, June 29, 2004, August 18, 2004, August 20, 2004, September 8, 2004, September 21, 2004 and September 21, 2004;

	•	our Current Report on Form 8-K/A filed with the SEC on September 14, 2004;

	•	the description of Calpine’s common stock contained in Calpine’s Registration Statement on Form 8-A (File No. 001-12079), filed with the SEC on August 20, 1996; and

	•	the description of rights relating to our common stock contained in our Registration Statement on Form 8-A (File No. 001-12079), filed with the SEC on June 17, 1997, and the amendments to that Registration Statement filed on June 18, 1997, June 24, 1997 and September 28, 2001.

This prospectus also incorporates by reference any future filings we make with the SEC under Sections 13(a), 13(c), 14 or 15(d) of the Securities Exchange Act until we sell all of the securities being registered or until this offering is otherwise terminated.

If you request a copy of any or all of the documents incorporated by reference, then we will send to you the copies you requested at no charge. However, we will not send exhibits to such documents, unless such exhibits are specifically incorporated by reference in such documents. You should direct requests for such copies either by writing to Calpine Corporation, 50 West San Fernando Street, San Jose, California 95113, attention: Lisa M. Bodensteiner, Assistant Secretary, or by telephoning (408) 995-5115.

We have filed with the SEC a joint registration statement on Form S-3 under the Securities Act of 1933, as amended (the “Securities Act”), covering the securities described in this prospectus. This prospectus does not contain all of the information included in the registration statement. Any statement made in this prospectus concerning the contents of any contract, agreement or other document is only a summary of the actual contract, agreement or other document. If we have filed any contract, agreement or other document as an exhibit to the registration statement, you should read the exhibit for a more complete understanding of the document or matter involved. Each statement regarding a contract, agreement or other document is qualified in its entirety by reference to the actual document. Copies of documents described herein are available free of charge upon request as provided in the preceding paragraph.

Some of the statements contained or incorporated by reference in this prospectus are forward-looking statements within the meaning of Section 27A of the Securities Act and Section 21E of the Securities Exchange Act and are subject to the safe harbor created by the Private Securities Litigation Reform Act of 1995. These statements include declarations regarding our or our management’s intents, beliefs or current expectations. In some cases, you can identify forward-looking statements by terminology such as “may,” “will,” “should,” “expects,” “plans,” “anticipates,” “believes,” “estimates,” “predicts,” “potential,” or “continue” or the negative of these terms or other comparable terminology. Any forward-looking statements are not guarantees of future performance and actual results could differ materially from those indicated by the forward-looking statements. Forward-looking statements involve known and unknown risks, uncertainties, and other factors that may cause our or our industry’s actual results, levels of activity, performance, or achievements to be materially different from any future results, levels of activity, performance, or achievements expressed or implied by such forward-looking statements.

Among the important factors that could cause actual results to differ materially from those indicated by such forward-looking statements are the following:


	•	the timing and extent of deregulation of energy markets and the rules and regulations adopted on a transitional basis with respect thereto;

	•	the timing and extent of changes in commodity prices for energy, particularly natural gas and electricity and the impact of related derivatives transactions;

	•	supply of and demand for power in the markets served by our power generation facilities, including the potential effects of unseasonable weather patterns that result in reduced demand for power and unscheduled outages of our power generation facilities;

	•	economic slowdowns, which can adversely affect consumption of power by businesses and consumers;

	•	the inability to commence commercial operation of new facilities, whether as a result of failure to obtain the necessary permits to operate, failure of third-party contractors to perform their contractual obligations, inability to obtain project financing on acceptable terms or otherwise;

	•	our ability to accurately estimate future costs;

	•	development of lower-cost power plants or of a lower-cost means of operating a fleet of power plants by our competitors;

	•	our ability to market and sell power from power plants in the evolving energy market;

	•	the successful exploitation of an oil or gas resource that ultimately depends upon the geology of the resource, the total amount and costs to develop recoverable reserves, and legal title, regulatory, gas administration, marketing and operational factors relating to the extraction of natural gas;

	•	our ability to accurately estimate oil and gas reserves;

	•	reduced liquidity in the trading and power industry;

	•	our ability to access the capital markets on attractive terms or at all;

	•	our ability to accurately estimate sources and uses of cash, which estimates are based on current expectations;

	•	the direct or indirect effects on our business of a lowering of our credit rating (or actions we may take in response to changing credit rating criteria), including increased collateral requirements, refusal by our current or potential counterparties to enter into transactions with us and our inability to obtain credit or capital in desired amounts or on favorable terms;

	•	possible future claims, litigation and enforcement actions pertaining to the foregoing;

	•	effects of the application of regulations, including changes in regulations or the interpretation thereof;

	•	other risks identified in this prospectus; and.

	•	other risks identified from time to time in our reports and registration statements filed with the SEC, including the risk factors identified in our Annual Report on Form 10-K/ A for the year ended December 31, 2003, which is incorporated by reference in this prospectus.

Although we believe that the expectations reflected in the forward-looking statements are reasonable, we cannot guarantee future results, levels of activity, performance or achievements.

The following table sets forth Calpine’s consolidated ratio of earnings to fixed charges for each of the last five years and for the six months ended June 30, 2004.

For purposes of computing our consolidated ratio of earnings to fixed charges, earnings consist of pre-tax income before adjustment for minority interests in our consolidated subsidiaries and income or loss from equity investees, plus fixed charges, amortization of capitalized interest and distributed income of equity investees, reduced by interest capitalized, the minority interest in pre-tax income of subsidiaries that have not incurred fixed charges and distributions on our company-obligated Remarketable Term Income Deferrable Equity Securities (“HIGH TIDES”). Fixed charges consist of interest expensed and capitalized (including amortized premiums, discounts and capitalized expenses related to indebtedness), an estimate of the interest within rental expense and the distributions on the HIGH TIDES.


(1)	For the year ended December 31, 2002, Calpine had an earnings-to-fixed-charges coverage deficiency of approximately $587.1 million, primarily as a result of (a) a pre-tax charge to earnings of $404.7 million for equipment cancellation and asset impairment, (b) increased interest costs due to recent debt financings to support our growth, and (c) a significant decrease in electricity prices, gas prices and spark spreads, primarily as a result of weak market fundamentals as compared to the year ended December 31, 2001.

(2)	For the year ended December 31, 2003, we had an earnings-to-fixed-charges coverage deficiency of approximately $269.8 million, primarily as a result of (a) a pre-tax charge to earnings of $64.4 million for equipment cancellation and asset impairment and $16.4 million for long-term service agreement cancellation charges, (b) increased interest costs due to recent debt financings to support our growth, and (c) a decrease in average spark spreads per megawatt-hour and higher fuel expense in 2003 as compared with the same period in 2002.

(3)	For the six months ended June 30, 2004, we had an earnings-to-fixed charges coverage deficiency of approximately $442.2 million, primarily as a result of (a) a decrease in gross profit of $152.5 million from the same period in the previous year, which is a result of lower per megawatt-hour spark spreads realized during the six months ended June 30, 2004, and additional costs associated with new power plants coming on line, and (b) a pre-tax charge to earnings of $534.4 million for increased interest costs due to recent debt financings to support our growth.

Unless otherwise specified in a prospectus supplement accompanying this prospectus, we will add the net proceeds from the sale of the securities to which this prospectus and the prospectus supplement relate to our general funds, which we will use, directly or indirectly, for financing power projects under development or construction, working capital, general corporate purposes and any other purpose specified in a prospectus supplement. We may conduct concurrent or additional financings at any time. The net proceeds from the sale of debt securities by Energy Finance or Energy Finance II to which this prospectus relates will be lent to us or our affiliates by Energy Finance or Energy Finance II, as applicable, pursuant to one or more intercompany loans. The net proceeds from the sale of trust preferred securities and trust common securities by Trust IV and Trust V to which this prospectus relates will be used to purchase our debt securities, and, unless otherwise specified in a prospectus supplement accompanying this prospectus, we will add the net proceeds from the sale of such debt securities to our general funds, which we will use, directly or indirectly, for financing power projects under development or construction, working capital, general corporate purposes and any other purpose specified in a prospectus supplement.

We may sell the securities offered through this prospectus in and outside the United States (i) to or through underwriters or dealers, (ii) directly to purchasers, including our affiliates, (iii) through agents, or (iv) through a combination of any these methods. The securities may be distributed at a fixed price or prices, which may be changed, market prices prevailing at the time of sale, prices related to the prevailing market prices, or negotiated prices. The prospectus supplement will include the following information:


	•	the terms of the offering;

	•	the names of any underwriters or agents;

	•	the name or names of any managing underwriter or underwriters;

	•	the purchase price of the securities;

	•	the net proceeds from the sale of the securities;

	•	any delayed delivery arrangements;

	•	any underwriting discounts, commissions and other items constituting underwriters’ compensation;

	•	any initial public offering price;

	•	any discounts or concessions allowed or reallowed or paid to dealers; and

	•	any commissions paid to agents.

If underwriters are used in the sale, the underwriters will acquire the securities for their own account, including through underwriting, purchase, security lending or repurchase agreements with us. The underwriters may resell the securities from time to time in one or more transactions, including negotiated transactions. Underwriters may sell the securities in order to facilitate transactions in any of our other securities (described in this prospectus or otherwise), including other public or private transactions and short sales. Underwriters may offer securities to the public either through underwriting syndicates represented by one or more managing underwriters or directly by one or more firms acting as underwriters. Unless otherwise indicated in the prospectus supplement, the obligations of the underwriters to purchase the securities will be subject to certain conditions, and the underwriters will be obligated to purchase all the offered securities if they purchase any of them. The underwriters may change from time to time any initial public offering price and any discounts or concessions allowed or reallowed or paid to dealers.

If dealers are used in the sale of securities offered through this prospectus, we will sell the securities to them as principals. They may then resell those securities to the public at varying prices determined by the dealers at the time of resale. The prospectus supplement will include the names of the dealers and the terms of the transaction.

We may sell the securities offered through this prospectus directly. In this case, no underwriters or agents would be involved. Such securities may also be sold through agents designated from time to time. The prospectus supplement will name any agent involved in the offer or sale of the offered securities and will describe any commissions payable to the agent. Unless otherwise indicated in the prospectus supplement, any agent will agree to use its reasonable best efforts to solicit purchases for the period of its appointment.

We may sell the securities directly to institutional investors or others who may be deemed to be underwriters within the meaning of the Securities Act with respect to any sale of those securities. The terms of any such sales will be described in the prospectus supplement.

If the prospectus supplement indicates, we may authorize agents, underwriters or dealers to solicit offers from certain types of institutions to purchase securities at the public offering price under delayed delivery contracts. These contracts would provide for payment and delivery on a specified date in the future. The contracts would be subject only to those conditions described in the prospectus supplement. The applicable prospectus supplement will describe the commission payable for solicitation of those contracts.

Unless the applicable prospectus supplement states otherwise, each series of offered securities will be a new issue and will have no established trading market. We may elect to list any series of offered securities on an exchange. Any underwriters that we use in the sale of offered securities may make a market in such securities, but may discontinue such market making at any time without notice. Therefore, we cannot assure you that the securities will have a liquid trading market.

Any underwriter may also engage in stabilizing transactions, syndicate covering transactions and penalty bids in accordance with Rule 104 under the Securities Exchange Act. Stabilizing transactions involve bids to purchase the underlying security in the open market for the purpose of pegging, fixing or maintaining the price of the securities. Syndicate covering transactions involve purchases of the securities in the open market after the distribution has been completed in order to cover syndicate short positions.

Penalty bids permit the underwriters to reclaim a selling concession from a syndicate member when the securities originally sold by the syndicate member are purchased in a syndicate covering transaction to cover syndicate short positions. Stabilizing transactions, syndicate covering transactions and penalty bids may cause the price of the securities to be higher than it would be in the absence of the transactions. The underwriters may, if they commence these transactions, discontinue them at any time.

We and the underwriters may engage in derivative transactions involving the securities. These derivatives may consist of short sale transactions and other hedging activities. The underwriters may acquire a long or short position in the securities, hold or resell securities acquired and purchase options or futures on the securities and other derivative instruments with returns linked to or related to changes in the price of the securities. In order to facilitate these derivative transactions, we may enter into security lending or repurchase agreements with the underwriters. The underwriters may effect the derivative transactions through sales of the securities to the public, including short sales, or by lending the securities in order to facilitate short sale transactions by others. The underwriters may also use the securities purchased or borrowed from us or others (or, in the case of derivatives, securities received from us in settlement of those derivatives) to directly or indirectly settle sales of the securities or close out any related open borrowings of the securities.

Subject to the limitations under Rule 415(a)(4)(ii) under the Securities Act, we may offer our securities into an existing trading market on the terms described in the applicable prospectus supplement. Underwriters and dealers who may participate in any at-the-market offerings include Deutsche Bank Securities Inc.

Agents, underwriters, and dealers may be entitled, under agreements entered into with us, to indemnification by Calpine and, if applicable, Energy Finance, Energy Finance II, Trust IV or Trust V, against certain liabilities, including liabilities under the Securities Act. Our agents, underwriters, and dealers, or their affiliates, may be customers of, engage in transactions with or perform services for us, in the ordinary course of business.

As of June 30, 2004, there were 439,326,249 shares of our common stock outstanding. In addition, as of June 30, 2004, there were 24,020,742 shares of our common stock underlying vested stock options eligible for sale and there were an additional 35,997,981 shares of our common stock issuable upon conversion of our outstanding convertible securities (including the HIGH TIDES). The holders of common stock are entitled to one vote per share on all matters to be voted upon by the stockholders. Subject to preferences that may be applicable to any outstanding preferred stock, the holders of common stock are entitled to receive ratably such dividends, if any, as may be declared from time to time by the board of directors out of legally available funds. See “— Dividend Policy,” below. In the event of our liquidation, dissolution or winding up, the holders of common stock are entitled to share ratably in all assets remaining after payment of liabilities, subject to prior liquidation rights of preferred stock, if any, then outstanding. The common stock has no preemptive or conversion rights or other subscription rights. There are no redemption or sinking fund provisions applicable to the common stock. Pursuant to a rights agreement entered into in June 1997, as amended, our shares of common stock outstanding prior to the occurrence of events specified in the rights agreement have certain preferred share purchase rights, which are set forth in more detail in the rights agreement incorporated by reference as an exhibit to Calpine’s Annual Report on Form 10-K/ A for the year ended December 31, 2003, which is incorporated by reference in this prospectus. See “— Anti-Takeover Effects of Provisions of the Certificate of Incorporation, Bylaws and Delaware Law — Rights Plan,” below.

As of September 10, 2004, there were no shares of our preferred stock outstanding. Our board of directors has the authority, without further vote or action by the stockholders, to issue from time to time up to 10,000,000 shares of preferred stock in one or more series, and to fix the rights, preferences, privileges, qualifications, limitations and restrictions granted to or imposed upon any wholly unissued shares of undesignated preferred stock, including without limitation dividend rights, if any, voting rights, if any, and liquidation and conversion rights, if any. Our board of directors has the authority to fix the number of shares constituting any series and the designations of such series without any further vote or action by the stockholders. Our board of directors, without stockholder approval, can issue preferred stock with voting and conversion rights which could adversely affect the voting power of the holders of common stock. The issuance of preferred stock may have the effect of delaying, deferring or preventing a change in control of Calpine, or could delay or prevent a transaction that might otherwise give our stockholders an opportunity to realize a premium over the then prevailing market price of the common stock.

Our board of directors has authorized the issuance of up to 1,000,000 shares of Series A Participating Preferred Stock, par value $.001 per share, pursuant to a rights plan adopted by our board of directors on June 5, 1997, which was amended on September 19, 2001. As of September 10, 2004, no shares of our participating preferred stock were outstanding. A description of the rights plan and the participating preferred stock is set forth under “— Anti-Takeover Effects of Provisions of Certificate of Incorporation, Bylaws and Delaware Law — Rights Plan,” below.

In connection with the business combination with Encal, a series of our preferred stock, consisting of one share, was designated as special voting preferred stock, having a par value of $.001 and a liquidation preference of $.001. The one share of special voting preferred stock has been redeemed and cancelled.

Anti-Takeover Effects of Provisions of the Certificate of Incorporation, Bylaws and Delaware Law

On June 5, 1997, we adopted a stockholders’ rights plan to strengthen our ability to protect our stockholders. The rights plan was amended on September 19, 2001. The rights plan is designed to protect against abusive or coercive takeover tactics that are not in the best interests of Calpine or its stockholders. To implement the rights plan, we declared a dividend of one preferred share purchase right for each outstanding share of our common stock held on record as of June 18, 1997, and directed the issuance of one preferred share purchase right with respect to each share of our common stock that shall become outstanding thereafter until the rights become exercisable or they expire as described below. Each right initially represents a contingent right to purchase, under certain circumstances, one one-thousandth of a share, called a “unit,” of our Series A Participating Preferred Stock, par value $.001 per share, at a price of $140.00 per unit, subject to adjustment. The rights will become exercisable and trade independently from our common stock upon the public announcement of the acquisition by a person or group of 15% or more of our common stock, or ten days after commencement of a tender or exchange offer that would result in the acquisition of 15% or more of our common stock. Each unit purchased upon exercise of the rights will be entitled to a dividend equal to any dividend declared per share of common stock and will have one vote, voting together with the common stock. In the event of our liquidation, each unit purchased upon exercise of the rights will be entitled to any payment made per share of common stock.

The following is a general description of the depositary shares to which this prospectus and any prospectus supplement may relate. The applicable prospectus supplement will describe the specific terms of the depositary shares offered through that prospectus supplement, as well as any general terms described in this section that will not apply to those depositary shares.

The following description of the depositary shares is subject to the detailed provisions of the depositary receipts and the deposit agreement relating to the applicable series of preferred stock, the form of each of which has been filed as an exhibit to the registration statement of which this prospectus is a part. Whenever particular provisions of the depositary receipts or deposit agreement, or terms defined therein, are referred to, those provisions or definitions are incorporated by reference herein and such descriptions are qualified in their entirety by such reference. We urge you to read the depositary receipts and the depositary agreement because they, and not this description, describe every detail of the terms of the depositary shares. The summary below of the general terms of the depositary shares will be supplemented by the more specific terms in a prospectus supplement.

Calpine may, at its option, elect to have shares of its preferred stock represented by depositary shares. The shares of any series of preferred stock underlying the depositary shares will be deposited under a separate deposit agreement that we will enter into with a bank or trust company of our choosing. The prospectus supplement relating to a series of depositary shares will give the name and address of the depositary. Subject to the terms of the deposit agreement, each owner of a depositary share will be entitled to all the rights and preferences of the preferred stock underlying the depositary share in proportion to the applicable interest in the preferred stock underlying the depositary share.

The depositary shares will be evidenced by depositary receipts issued pursuant to the deposit agreement. Each depositary share will represent the applicable interest in a number of shares of a particular series of the preferred stock described in the applicable prospectus supplement.

Unless otherwise provided in the applicable prospectus supplement, upon surrender of depositary shares at the office of the depositary and upon payment of the charges provided in the deposit agreement, a holder of depositary shares will be entitled to the number of whole shares of the related series of preferred stock evidenced by the surrendered depositary shares.

The depositary will distribute all cash dividends or other cash distributions received in respect of the preferred stock to the record holders of depositary shares representing the preferred stock in proportion to the number of the depositary shares owned by the holders on the relevant record date. The depositary will distribute only that amount which can be distributed without attributing to any depositary shareholders a fraction of one cent, and any balance not so distributed will be added to and treated as part of the next sum received by the depositary for distribution to record depositary shareholders.

If there is a distribution other than in cash, the depositary will distribute property to the entitled record depositary shareholders, unless the depositary determines that it is not feasible to make that distribution. In that case the depositary may, with our approval, adopt the method it deems equitable and practicable for making that distribution, including any sale of property and the distribution of the net proceeds from this sale to the concerned holders.

The deposit agreement will also contain provisions relating to the manner in which any subscription or similar rights we offer to holders of preferred stock will be made available to holders of depositary shares.

If any preferred stock underlying depositary shares is convertible or exchangeable, each record holder of depositary shares will have the right or obligation to convert or exchange the depositary shares in the manner provided in the deposit agreement and described in the applicable prospectus supplement.

If the preferred stock underlying depositary shares is subject to redemption at our option, the depositary shares will be redeemed from the redemption proceeds received by the depositary. The redemption price per

depositary share will be equal to the aggregate redemption price payable with respect to the number of shares of preferred stock underlying the depositary shares. Whenever we redeem preferred stock from the depositary, the depositary will redeem as of the same redemption date a proportionate number of depositary shares representing the shares of preferred stock that we redeemed. If less than all the depositary shares are to be redeemed, the depositary shares to be redeemed will be selected by lot or pro rata as we may determine.

After the date fixed for redemption of the underlying preferred stock, the depositary shares called for redemption will no longer be deemed to be outstanding and all rights of the holders of the depositary shares will cease, except the right to receive the redemption price. Any funds Calpine deposits with the depositary for any depositary shares that the holders fail to redeem will be returned to us after two years from the date the funds are deposited.

Upon receipt of notice of any meeting or action in lieu of any meeting at which the holders of any shares of preferred stock underlying the depositary shares are entitled to vote, the depositary will mail the information contained in the notice to the record holders of the depositary shares relating to the preferred stock. Each record holder of the depositary shares on the record date, which will be the same date as the record date for the preferred stock, will be entitled to instruct the depositary as to the exercise of the voting rights pertaining to the number of shares of preferred stock underlying the holder’s depositary shares. The depositary will endeavor, insofar as practicable, to vote the number of shares of preferred stock underlying the depositary shares in accordance with these instructions, and we will agree to take all action that the depositary deems necessary to enable the depositary to do so.

The depositary receipt evidencing the depositary shares and any provision of the deposit agreement may at any time be amended by agreement between Calpine and the depositary. However, any amendment that materially and adversely alters the rights of the existing holders of depositary shares will not be effective unless the amendment has been approved by the record holders of at least a majority of the depositary shares then outstanding.

We will pay all transfer and other taxes and governmental charges that arise solely from the existence of the depositary arrangements. We will also pay charges of the depositary in connection with the initial deposit of the preferred stock and any exchange or redemption of the preferred stock. Holders of depositary shares will pay all other transfer and other taxes and governmental charges, and, in addition, any other charges that are expressly provided in the deposit agreement to be for their accounts.

The depositary may resign at any time by delivering to us notice of its election to do so, and we may at any time remove the depositary. Any resignation or removal will take effect upon the appointment of a successor depositary and its acceptance of the appointment. We will appoint the successor depositary within 60 days after delivery of the notice of resignation or removal.

The depositary may terminate, or we may direct the depositary to terminate, the deposit agreement if:


	•	we have redeemed or reacquired all outstanding depositary shares relating to the deposit agreement; or

	•	there has been a final distribution in respect of the preferred stock of any series in connection with our liquidation, dissolution or winding up and such distribution has been made to the related depositary shareholders.

Upon termination of the deposit agreement, the depositary will discontinue the transfer of depositary receipts, will suspend the distribution of dividends, and will not give any further notices (other than notice of the termination) or perform any further acts under the deposit agreement. However, the depositary will continue to deliver preferred stock certificates, together with dividends and distributions and the net proceeds of any sales of property, in exchange for depositary receipts surrendered. At our request, the depositary will

We, or at our option, the depositary, will make available to the holders of depositary shares all reports and communications that we are required to furnish to the holders of preferred stock.

Neither Calpine nor the depositary will be liable if the depositary is prevented or delayed by law or any circumstance beyond its control in performing its obligations under the deposit agreement. Our obligations and those of the depositary under the deposit agreement will be limited to performance in good faith of their respective duties under the deposit agreement. Neither Calpine nor the depositary will be obligated to prosecute or defend any legal proceeding regarding any depositary share or preferred stock unless satisfactory indemnity has been furnished. Calpine and the depositary may rely upon written advice of counsel or accountants. Calpine and the depositary may also rely upon information provided to them by persons presenting preferred stock for deposit, holders of depositary shares or other persons Calpine or the depositary believe to be competent. Calpine and the depositary may also rely upon documents they believe to be genuine.

The following is a general description of the debt securities to which this prospectus and any prospectus supplement may relate. The applicable prospectus supplement will describe the specific terms of the debt securities offered through that prospectus supplement, as well as any general terms described in this section that will not apply to those debt securities. Unless otherwise stated, the senior debt securities and the subordinated debt securities are together referred to as the “debt securities.”

Calpine may issue from time to time one or more series of debt securities under one or more separate indentures between Calpine and Wilmington Trust Company, as trustee; Energy Finance may issue from time to time one or more series of debt securities under one or more indentures between Energy Finance and Wilmington Trust Company, as trustee; and Energy Finance II may issue from time to time one or more series of debt securities under one or more indentures between Energy Finance II and Wilmington Trust Company, as trustee.

For purposes of this section, references to the “issuer” are to Calpine, in the case of debt securities issued by Calpine, to Energy Finance, in the case of debt securities issued by Energy Finance, and to Energy Finance II, in the case of debt securities issued by Energy Finance II, and references to the “guarantor” are to Calpine with respect to debt securities issued by Energy Finance or Energy Finance II. Additionally, in the case of debt securities issued by Energy Finance or Energy Finance II, the term “indenture” includes the guarantee agreement pursuant to which Calpine guarantees the debt securities.

The debt securities will be direct, unsecured obligations of the issuer. The senior debt securities will rank equally with all other senior debt of the issuer. The indentures will not limit the amount of debt securities that the issuer may issue. The subordination provisions of any subordinated debt securities will be described in an applicable prospectus supplement.

Almost all of Calpine’s operations are conducted through Calpine’s subsidiaries and other affiliates. As a result, Calpine depends almost entirely upon their earnings and cash flow to service Calpine’s indebtedness, including Calpine’s ability to pay the interest on and principal of Calpine’s debt securities, and on the debt securities of Energy Finance and Energy Finance II under the guarantees, if the guarantees are enforced. The non-recourse project financing agreements of certain of Calpine’s subsidiaries and other affiliates generally restrict their ability to pay dividends, make distributions or otherwise transfer funds to Calpine prior to the payment of other obligations, including operating expenses, debt service and reserves. Each of Energy Finance and Energy Finance II is a special purpose financing subsidiary formed solely as a financing vehicle for Calpine and its subsidiaries. Therefore, the ability of Energy Finance and Energy Finance II to pay their obligations under the debt securities is dependent upon the receipt by them of payments from Calpine and its subsidiaries to which they have made loans or otherwise under agreements with them in connection with their respective financing activities. In addition, under Canadian law, the respective direct parent companies of Energy Finance and Energy Finance II will be liable for their subsidiary’s indebtedness, including any debt securities issued by such subsidiary, upon a winding-up of that subsidiary. While each of Energy Finance and Energy Finance II believes that payments made to it in connection with its financing activities will be sufficient to pay the principal of, and interest on, any debt securities it issues, if the responsible parties were not able to make such payments for any reason, the holders of such debt securities would have to rely on the enforcement of Calpine’s guarantee described below.

Calpine’s subsidiaries and other affiliates are separate and distinct legal entities and will have no obligation to pay any amounts due on the debt securities issued by Calpine hereunder, and will not guarantee the payment of interest on or principal of the debt securities issued by Calpine hereunder. Calpine’s subsidiaries and other affiliates (other than Energy Finance (in the case of debt securities issued by Energy Finance) and Energy Finance II (in the case of debt securities issued by Energy Finance II) and their direct parent companies, respectively, in the case of the winding-up of its subsidiary) will not have any obligation to pay any amounts due on the debt securities issued by Energy Finance or Energy Finance II hereunder and none of Calpine’s subsidiaries or other affiliates will guarantee the payment of interest on or principal of the debt securities issued by Energy Finance or Energy Finance II hereunder. The right of Calpine’s debt security holders to receive any assets of any of Calpine’s subsidiaries or other affiliates upon Calpine’s liquidation or

reorganization will be subordinated to the claims of any subsidiaries’ or other affiliates’ creditors (including trade creditors and holders of debt issued by Calpine’s subsidiaries or affiliates, including Energy Finance and Energy Finance II). Similarly, the right of holders of Energy Finance’s or Energy Finance II’s debt securities to receive any assets of any of Calpine’s subsidiaries or other affiliates upon Calpine’s liquidation or reorganization will be subordinated to the claims of any subsidiaries’ or other affiliates’ creditors (including trade creditors and holders of debt issued by Calpine’s subsidiaries or affiliates). As of June 30, 2004, Calpine’s subsidiaries had approximately $13.0 billion of indebtedness and other liabilities, including trade payables and excluding deferred tax liabilities, which will be effectively senior to the debt securities and the guarantees.

The following description of the debt securities is subject to the detailed provisions of each indenture, a copy of each of which has been incorporated by reference as an exhibit to the registration statement of which this prospectus is a part. Whenever particular provisions of any indenture or terms defined therein are referred to, those provisions or definitions are incorporated by reference herein and such descriptions are qualified in their entirety by such reference. We urge you to read the forms of indentures because they, and not this description, describe every detail of the terms of the debt securities. The summary below of the general terms of the debt securities will be supplemented by the more specific terms in a prospectus supplement. Unless otherwise stated herein or in an applicable prospectus supplement, the following indenture description will apply to both senior and subordinated debt securities.

The prospectus supplement for a particular series of debt securities will specify the terms of the series of debt securities, including:


	•	the classification of the offered debt securities as senior or subordinated debt securities;

	•	the specific designation, the aggregate principal amount, the purchase price and the authorized denominations, if other than $1,000 and integral multiples of $1,000 of the offered debt securities;

	•	the percentage of the principal amount at which the debt securities will be issued;

	•	the date or date on which the debt securities will mature;

	•	the currency, currencies or currency units in which payments on the debt securities will be payable;

	•	the rate or rates at which the debt securities will bear interest, if any, or the method of determination of such rate or rates;

	•	the date or dates from which the interest, if any, shall accrue, the dates on which the interest, if any, will be payable and the method of determining holders to whom any of the interest shall be payable;

	•	the prices, if any, at which, and the dates at or after which, the issuer may or must repay, repurchase or redeem the debt securities;

	•	any right to convert the debt securities into, or exchange the debt securities for, shares of Calpine common stock or other securities or property;

	•	any sinking fund obligation with respect to the debt securities;

	•	if applicable, any additional material United States, and, in the case of debt securities issued by Energy Finance or Energy Finance II, Canadian, federal income tax consequences;

	•	the exchanges, if any, on which the debt securities may be listed; and

	•	any other material terms of the debt securities consistent with the provisions of the indenture.

Unless otherwise specified in the prospectus supplement, the issuer will compute interest payments on the basis of a 360-day year consisting of twelve 30-day months.

Some of the debt securities may be issued as discounted debt securities to be sold at a substantial discount below their stated principal amount. The prospectus supplement relating to any discounted series of debt securities will describe any special consequences applicable to discounted debt securities.


	•	limit the issuer’s ability to incur indebtedness; or

	•	provide protection in the event the issuer chooses to engage in a highly leveraged transaction, reorganization, restructuring, merger or similar transaction.

As described under “Description of Trust Preferred Securities,” below, Calpine may issue debt securities to Trust IV or Trust V in connection with the issuance of trust preferred or trust common securities by a trust. If Calpine issues debt securities to either of the trusts, it will issue only one series of debt securities to that trust and those debt securities subsequently may be distributed to the holders of trust preferred and trust common securities either upon dissolution of the trust or upon the occurrence of events that will be described in the applicable prospectus supplement. An event of default under the applicable indenture for a series of debt securities issued to a trust will constitute a trust enforcement event under the declaration of trust for the applicable trust preferred securities. A holder of trust preferred securities may directly institute a proceeding against us for enforcement of payment to that holder of its pro rata share of principal, premium, interest or any additional amounts if:


	•	an event of default under the applicable declaration of trust has occurred and is continuing; and

	•	that event of default is attributable to our failure to pay principal, any premium, interest or additional amounts on the applicable series of debt securities when due.

Except as described in the preceding sentences or in the prospectus supplement, the holders of trust preferred securities will not be able to exercise directly any other remedy available to the holders of the applicable series of debt securities.

Calpine may issue debt securities that are convertible into or exchangeable for, and Energy Finance and Energy Finance II may issue debt securities that are exchangeable for, common stock or preferred stock, property or cash, or a combination of any of the foregoing. The terms, if any, on which debt securities of any series will be convertible or exchangeable will be summarized in the prospectus supplement relating thereto. Such terms may include provisions, as applicable, for conversion or exchange, either on a mandatory basis, at the option of the holder, or at the issuer’s option, in which case the number of shares of common stock or preferred stock to be received by the holders of the debt securities would be calculated according to the factors and at such time as summarized in the related prospectus supplement. The prospectus supplement will also summarize certain of the material United States federal income tax consequences applicable to any such convertible or exchangeable debt securities.

The issuer may, from time to time, reopen an issue of debt securities and issue additional debt securities with the same terms (including maturity date and interest rate) as debt securities issued on an earlier date. After such additional debt securities are issued, they will be fungible with the debt securities issued on the earlier date to the extent specified in the applicable prospectus supplement.

Any senior debt securities issued by Calpine will be unsecured and will be effectively subordinated to all of Calpine’s existing and future secured indebtedness to the extent of the value of the assets securing that indebtedness, including indebtedness under Calpine’s secured term loans, senior secured credit facility and various series of secured senior notes. As of June 30, 2004, Calpine had $10.4 billion of secured indebtedness that would be effectively senior to the senior debt securities.

Calpine currently conducts substantially all its operations through its subsidiaries, and its subsidiaries generate substantially all of Calpine’s operating income and cash flow. As a result, distributions or advances from its subsidiaries are the principal source of funds necessary to meet Calpine’s debt service obligations. Contractual provisions or laws, as well as its subsidiaries’ financial condition and operating requirements, may limit Calpine’s ability to obtain cash from its subsidiaries that Calpine requires to pay its debt service obligations, including payments on any senior debt securities issued by Calpine. In addition, holders of any senior debt securities issued by Calpine will have a junior position to the claims of creditors of Calpine’s subsidiaries on the assets and earnings of such subsidiaries. As of June 30, 2004, Calpine’s subsidiaries had approximately $13.0 billion of indebtedness and other liabilities, including trade payables and excluding deferred tax liabilities, to which any senior debt securities issued by Calpine would be structurally subordinated.

Unless otherwise provided in the prospectus supplement relating to such securities, any senior debt securities issued by Calpine will rank equal in right of payment with (a) all of Calpine’s existing and future unsecured and unsubordinated indebtedness, including, without limitation, Calpine’s obligations under its outstanding senior debt securities, including Calpine’s 7 5/8% Senior Notes Due 2006, Calpine’s 7 3/4% Senior Notes Due 2009, Calpine’s 7 7/8% Senior Notes Due 2008, Calpine’s 8 3/4% Senior Notes Due 2007, Calpine’s 10 1/2% Senior Notes Due 2006, Calpine’s 8 1/4% Senior Notes Due 2005, Calpine’s 8 5/8% Senior Notes Due 2010, Calpine’s 8 1/2% Senior Notes Due 2011, Calpine’s 4% Convertible Senior Notes Due 2006 and Calpine’s 4 3/4% Contingent Convertible Senior Notes Due 2023 and (b) indebtedness of its subsidiaries guaranteed by Calpine, including the 8 1/2% Senior Notes Due 2008 and the 8 3/4% Senior Notes Due 2007 issued by Energy Finance, and the 8 7/8% Senior Notes Due 2011 and 8 3/8% Senior Notes Due 2008 issued by Energy Finance II. As of June 30, 2004, Calpine had approximately $14.5 billion of indebtedness outstanding, of which $10.4 billion was secured.

Unless otherwise provided in the prospectus supplement relating to such securities, debt securities issued by Energy Finance or Energy Finance II will be:


	•	senior unsecured obligations of Energy Finance or Energy Finance II, as applicable, and will rank equally and ratably with all of its other unsecured and unsubordinated indebtedness; and

	•	guaranteed on a senior unsecured basis by Calpine, which guarantee will rank equally and ratably with all other unsecured and unsubordinated indebtedness of Calpine, including Calpine’s indebtedness described above including the other indebtedness of its subsidiaries guaranteed by Calpine.

The subordinated debt securities issued by Calpine will be subordinate and junior in right of payment to all of Calpine’s senior indebtedness, including any guarantee by Calpine of senior debt securities of Energy Finance and Energy Finance II. The subordinated debt securities of Energy Finance and Energy Finance II will be subordinate and junior in right of payment to all of their respective senior indebtedness.

Calpine will fully and unconditionally guarantee to each holder of a debt security issued by Energy Finance or Energy Finance II and authenticated and delivered by the trustee the due and punctual payment of the principal of, and any premium and interest on, the debt security, when and as it becomes due and payable, whether at maturity, upon acceleration, by call for redemption, repayment or otherwise in accordance with the terms of the debt securities and of the related indenture. The claims of holders under the guarantee by Calpine will be effectively subordinated to the claims of creditors of Calpine’s subsidiaries other than Energy Finance or Energy Finance II, as applicable.


	•	agree that, if an event of default occurs under the debt securities, its obligations under the guarantees will be absolute and unconditional and will be enforceable irrespective of any invalidity, irregularity or unenforceability of any series of the debt securities or the related indenture or any supplement thereto, and

	•	waive its right to require the trustee or the holders to pursue or exhaust their legal or equitable remedies against Energy Finance or Energy Finance II before exercising their rights under the guarantees.

The indentures and the guarantee shall provide that, except as otherwise set forth under “— Defeasance,” below, for so long as any debt securities remain outstanding or any amount remains unpaid on any of the debt securities, the issuer and the guarantor, if any, will comply with the applicable terms of the covenants contained in the indentures or the guarantee, as applicable, including the following:

The issuer will duly and punctually pay the principal of and interest on the debt securities in accordance with the terms of the debt securities and the indenture.

The issuer will maintain in the Borough of Manhattan, the City of New York, and such other locations as may be required or specified in any supplement, an office or agency where the debt securities may be paid and notices and demands to or upon the issuer in respect of the debt securities and the indentures may be served and an office or agency where debt securities may be surrendered for registration of transfer or exchange. The issuer will give prompt written notice to the trustee of the location, and any change in the location, of any such office or agency. If at any time the issuer shall fail to maintain any required office or agency or shall fail to furnish the trustee with the address of any required office or agency, all presentations, surrenders, notices and demands may be served at the office of the trustee.

The issuer, the guarantor, if any, and the trustee will execute and deliver all documents, instruments and agreements, and do all other acts and things as may be reasonably required, to enable the trustee to exercise and enforce its rights under the indentures and under the documents, instruments and agreements required under the indentures and to carry out the intent of the indentures.

Under the terms of the indentures, the issuer and the guarantor, if any, shall not, and shall not permit any of their respective Restricted Subsidiaries to, enter into any Sale/ Leaseback Transaction unless:


	(a) the issuer or the guarantor, as the case may be, or the Restricted Subsidiary would be entitled to create a Lien on the property or asset subject to the Sale/ Leaseback Transaction securing Indebtedness in an amount equal to the Attributable Debt with respect to that transaction without equally and ratably securing the debt securities pursuant to the covenant entitled “Limitation on Liens”; or

	(b) the net proceeds of the sale are at least equal to the fair value (as determined by board of directors of the issuer or the guarantor, as the case may be) of the property or asset subject to the Sale/ Leaseback Transaction and the issuer or the guarantor, as the case may be, or the Restricted Subsidiary applies or causes to be applied, within 180 days of the effective date of the Sale/ Leaseback Transaction, an amount in cash equal to the net proceeds of the sale to the retirement of Indebtedness of the issuer or the guarantor, as the case may be, or of the Restricted Subsidiary.

In addition to the transactions permitted pursuant to the above clauses (a) and (b), the issuer and the guarantor, if any, or any of their respective Restricted Subsidiaries may enter into a Sale/ Leaseback Transaction as long as the sum of:


	•	the Attributable Debt with respect to that Sale/ Leaseback Transaction and all other Sale/ Leaseback Transactions entered into pursuant to this provision; plus

	•	the amount of outstanding Indebtedness secured by Liens incurred pursuant to the final provision to the covenant described under “— Limitation on Liens,” below;

does not exceed 15% of Consolidated Net Tangible Assets as determined based on Calpine’s consolidated balance sheet as of the end of the most recent fiscal quarter for which financial statements are available. In addition, any Restricted Subsidiary of the issuer or the guarantor, if any, may enter into a Sale/ Leaseback Transaction with respect to property or assets owned by that Restricted Subsidiary, so long as the proceeds of that Sale/ Leaseback Transaction are used to explore, drill, develop, construct, purchase, repair, improve or add to property and assets of any Restricted Subsidiary or to repay (within 365 days of the commencement of full commercial operation of any such property or assets) Indebtedness incurred to explore, drill, develop, construct, purchase, repair, improve or add to property or assets of any Restricted Subsidiary.

“Attributable Debt,” in respect of a Sale/ Leaseback Transaction, means, as at the time of determination, the present value (discounted at the rate of interest set forth or implicit in terms of the lease (or, if not practicable to determine that rate, the weighted average rate of interest borne by the debt securities outstanding hereunder (calculated, in the event of the issuance of any original issue discount debt securities, based on the computed interest rate with respect thereto)), compounded annually) of the total obligations of the lessee for rental payments during the remaining term of the lease included in such Sale/ Leaseback Transaction (including any period for which such lease has been extended).

“Capitalized Lease Obligations” of a person means the rental obligations under any lease of any property (whether real, personal or mixed) of which the discounted present value of the rental obligations of that person as lessee, in conformity with generally accepted accounting principals, is required to be capitalized on the balance sheet of that person; the stated maturity of any such lease shall be the date of the last payment of rent or any other amount due under such lease prior to the first date upon which such lease may be terminated by the lessee without payment of a penalty.

“Consolidated Current Liabilities” means, as of any date of determination, the aggregate amount of consolidated liabilities of Calpine and Calpine’s consolidated Restricted Subsidiaries which may properly be classified as current liabilities (including taxes accrued as estimated), after eliminating (i) all inter-company items between Calpine and its subsidiaries and (ii) all current maturities of long-term Indebtedness, all as determined in accordance with generally accepted accounting principles.

“Consolidated Net Tangible Assets” means, as of any date of determination, the total amount of Calpine’s consolidated assets (less accumulated depreciation or amortization, allowances for doubtful receivables, other applicable reserves and other properly deductible items) under generally accepted accounting principles which would appear on Calpine’s consolidated balance sheet, determined in accordance with generally accepted accounting principles, and after giving effect to purchase accounting and after deducting therefrom, to the extent otherwise included, the amounts of:


	(a) Consolidated Current Liabilities;

	(b) minority interests in Calpine’s consolidated subsidiaries held by persons other than Calpine or any of its Restricted Subsidiaries;

	(c) excess of cost over fair value of assets of businesses acquired, as determined in good faith by Calpine’s board of directors;

	(d) any revaluation or other write-up in value of assets subsequent to December 31, 1993 as a result of a change in the method of valuation in accordance with generally accepted accounting principles;

	(e) unamortized debt discount and expenses and other unamortized deferred charges, goodwill, patents, trademarks, service marks, trade names, copyrights, licenses, organization or developmental expenses and other intangible items;

	(f) treasury stock; and

	(g) any cash set apart and held in a sinking or other analogous fund established for the purpose of redemption or other retirement of capital stock to the extent such obligation is not reflected in Consolidated Current Liabilities.


	(a) the principal of and premium (if any premium is then due and owing) in respect of indebtedness of that person for money borrowed;

	(b) all Capitalized Lease Obligations of that person;

	(c) all obligations of that person for the reimbursement of any obligor on any letter of credit, banker’s acceptance or similar credit transaction, other than obligations with respect to letters of credit securing obligations (other than obligations described in clauses (a) and (b) above) entered into in the ordinary course of business of that person to the extent such letters of credit are not drawn upon or, if and to the extent drawn upon, that drawing is reimbursed no later than the tenth business day following receipt by that person of a demand for reimbursement following payment on the letter of credit;

	(d) all obligations of the type referred to in clauses (a) through (c) above of other persons and all dividends of other persons for the payment of which, in either case, that person is responsible or liable, directly or indirectly, as obligor, guarantor or otherwise; and

	(e) all obligations of the type referred to in clauses (a) through (d) above of other persons secured by any Lien on any property or asset of that person (whether or not such obligation is assumed by that person), the amount of the obligation on any date of determination being deemed to be the lesser of the value of the property or assets or the amount of the obligation so secured.

The amount of Indebtedness of any person at any date shall be, with respect to unconditional obligations, the outstanding balance at such date of all such obligations as described above and, with respect to any

“Lien” means any mortgage, lien, pledge, charge, or other security interest or encumbrance of any kind (including any conditional sale or other title retention agreement and any lease in the nature thereof).

“Preferred Stock,” as applied to the capital stock of any corporation, means capital stock of any class or classes (however designated) which is preferred as to the payment of dividends, or as to the distribution of assets upon any voluntary or involuntary liquidation or dissolution of such corporation, over shares of capital stock of any other class of such corporation.

“Restricted Subsidiary” means any subsidiary of a person that is not designated an Unrestricted Subsidiary by that person’s board of directors.

“Sale/ Leaseback Transaction” means an arrangement relating to property now owned or later acquired whereby a person or one of such person’s subsidiaries transfers that property to another person and then leases it back from that person, other than leases for a term of not more than 36 months or leases between such person and a wholly owned subsidiary of such person or between such person’s wholly owned subsidiaries.

“Senior Indebtedness” means all indebtedness incurred, assumed or guaranteed by a person, whether or not represented by bonds, debentures, notes or other securities, for money borrowed, and any deferrals, renewals or extensions or refunding of any such indebtedness, unless in the instrument creating or evidencing any such indebtedness or pursuant to which the same is outstanding it is specifically stated, at or prior to the time such person becomes liable in respect thereof, that any such indebtedness or such deferral, renewal, extension or refunding thereof is not Senior Indebtedness.

“Subordinated Security” means any security issued under an Indenture which is designated as a Subordinated Debt Security.

“Unrestricted Subsidiary” means (i) any subsidiary that at the time of determination shall be designated an Unrestricted Subsidiary by a person’s board of directors in the manner provided below and (ii) any subsidiary of an Unrestricted Subsidiary. A person’s board of directors may designate any subsidiary (including any newly acquired or newly formed subsidiary) to be an Unrestricted Subsidiary unless such subsidiary owns any capital stock of, or owns or holds any Lien on any property of, that person or any other subsidiary of that person that is not a subsidiary of the subsidiary to be so designated, so long as the subsidiary to be designated an Unrestricted Subsidiary and all other subsidiaries previously so designated at the time of any determination hereunder shall, in the aggregate, have total assets not greater than 5% of Consolidated Net Tangible Assets as determined based on Calpine’s consolidated balance sheet as of the end of the most recent financial quarter for which financial statements are available. A person’s board of directors may designate any Unrestricted Subsidiary to be a Restricted Subsidiary; provided, however, that immediately after giving effect to that designation no Default or Event of Default under the indentures shall have occurred and be continuing. Any such designation by a person’s board of directors shall be evidenced to the trustee by promptly filing with the trustee a copy of the board resolution giving effect to the designation and a certificate signed by two of that person’s officers certifying that the designation complied with these provisions. However, the failure to file the resolution and/or certificate with the trustee shall not impair or affect the validity of the designation.

Under the terms of the indentures, the issuer and the guarantor, if any, shall not, and shall not permit any of their respective Restricted Subsidiaries to, directly or indirectly, incur any Lien upon any properties or assets (including capital stock) whether owned at the date of issuance of the debt securities or thereafter acquired, in each case to secure Indebtedness of Calpine or any Restricted Subsidiary, without effectively providing that the outstanding debt securities shall be secured equally and ratably with (or prior to) that Indebtedness, so long as that Indebtedness shall be so secured. The above restriction on Liens will not, however, apply to:

(a)(1) Liens securing Indebtedness incurred by Calpine or any Restricted Subsidiary to finance the exploration, drilling, development, construction or purchase of or by, or repairs, improvements or additions to, property or assets, which Liens may include Liens on the capital stock of a Restricted Subsidiary or (2) Liens incurred by any Restricted Subsidiary that does not own, directly or indirectly, at


	the time of such original incurrence of such Lien under this clause (2) any operating properties or assets securing Indebtedness incurred to finance the exploration, drilling, development, construction or purchase of or by or repairs, improvements or additions to, property or assets of any Restricted Subsidiary that does not, directly or indirectly, own any operating properties or assets at the time of such original incurrence of such Lien, which Liens may include Liens on the capital stock of one or more Restricted Subsidiaries that do not, directly or indirectly, own any operating properties or assets at the time of such original incurrence of such Lien, provided, however, that the Indebtedness secured by any such Lien may not be issued more than 365 days after the later of the exploration, drilling, development, completion of construction, purchase, repair, improvement, addition or commencement of full commercial operation of the property or assets being so financed;

	(b) Liens existing on the date of issuance of a series of debt securities, other than Liens relating to Indebtedness or other obligations being repaid or Liens that are otherwise extinguished with the proceeds of any offering of debt securities pursuant to the indenture;

	(c) Liens on property, assets or shares of stock of a person at the time that person becomes a subsidiary of the issuer or the guarantor, as applicable; provided, however, that any such Lien may not extend to any other property or assets owned by such issuer or guarantor or any of its Restricted Subsidiaries;

	(d) Liens on property or assets existing at the time that the issuer or the guarantor, as the case may be, or one of its subsidiaries, acquires the property or asset, including any acquisition by means of a merger or consolidation with or into the issuer or the guarantor, as applicable, or one of its subsidiaries; provided, however, that such Liens are not incurred in connection with, or in contemplation of, that merger or consolidation and provided, further, that the Lien may not extend to any other property or asset owned by the issuer or the guarantor, as applicable, or any of its Restricted Subsidiaries;

	(e) Liens securing Indebtedness or other obligations of one of the subsidiaries of the issuer or the guarantor, as the case may be, that is owing to such issuer or guarantor or any of its Restricted Subsidiaries, or Liens securing Indebtedness of the issuer or the guarantor, as the case may be, or other obligations that are owing to one of the subsidiaries of such issuer or guarantor;

	(f) Liens incurred on assets that are the subject of a Capitalized Lease Obligation to which the issuer or the guarantor, as the case may be, or any of its subsidiaries is a party, which shall include Liens on the stock or other ownership interest in one or more Restricted Subsidiaries of such issuer or guarantor, leasing such assets;

	(g) Liens to secure any refinancing, refunding, extension, renewal or replacement (or successive refinancings, refundings, extensions, renewals or replacements) as a whole, or in part, of any Indebtedness secured by any Lien referred to in clauses (a), (b), (c), (d) and (f) above, provided, however, that (1) such new Lien shall be limited to all or part of the same property or assets that secured the original Lien (plus repairs, improvements or additions to that property or assets and Liens on the stock or other ownership interest in one or more Restricted Subsidiaries beneficially owning that property or assets) and (2) the amount of Indebtedness secured by such Lien at such time (or, if the amount that may be realized in respect of such Lien is limited, by contract or otherwise, such limited lesser amount) is not increased, other than by an amount necessary to pay fees and expenses, including premiums, related to the refinancing, refunding, extension, renewal or replacement of the Indebtedness; and

	(h) Liens by which the debt securities are secured equally and ratably with other Indebtedness pursuant to this covenant.

However, the issuer and the guarantor, if any, and any one or more of their respective Restricted Subsidiaries may incur other Liens to secure Indebtedness as long as the sum of:


	•	the lesser of (1) the amount of outstanding Indebtedness secured by Liens incurred pursuant to this provision (or, if the amount that may be realized in respect of such Lien is limited, by contract or otherwise, such limited lesser amount) and (2) the fair market value of the property securing that item of Indebtedness; plus

	•	the Attributable Debt with respect to all Sale/ Leaseback Transactions entered into pursuant to clause (a) described under the covenant “Limitation on Sale/ Leaseback Transactions”;

Nothing in the indentures shall prevent the issuer and the guarantor, if any, from consolidating with or merging into another corporation or conveying, transferring or leasing their respective properties and assets substantially as an entirety to any person, provided that (a) the successor entity assumes the obligations of the issuer or the guarantor, as the case may be, on each series of debt securities outstanding and (b) immediately after giving effect to the transaction, no Event of Default, and no event which, after notice or lapse of time or both, would become an Event of Default, shall have occurred and be continuing.

Calpine is subject to the informational reporting requirements of Sections 13 and 15(d) under the Securities Exchange Act and, in accordance with those requirements, files certain reports and other information with the SEC. See “Where You Can Find More Information; Documents Incorporated by Reference,” above. In addition, if Sections 13 and 15(d) cease to apply to Calpine, Calpine will covenant in the indentures to file those reports and information with the trustee, and to mail such reports and information to holders of the debt securities at their registered addresses, for so long as any debt securities remain outstanding.

The indentures will require that the issuer and the guarantor, if any, file annually with the trustee a certificate describing any “Default,” which is defined in the indentures as any event which is, or after notice or passage of time or both would be, an Event of Default, by the issuer or the guarantor, as the case may be, in the performance of any conditions or covenants under the indentures and the status of any such Default. The issuer and the guarantor, if any, also must give the trustee written notice within 30 days of the occurrence of certain Defaults under the indentures that could mature into Events of Default, as described under the caption “— Events of Default,” below.

“Events of Default” are defined in the indentures with respect to any series of debt securities as any of the following:


	(a) default for 30 days in payment of any interest installment due and payable on any debt securities of such series;

	(b) default in payment of principal or premium, if any, when due on the debt securities of such series;

	(c) default in the making of any sinking fund payment or analogous obligation on the debt securities of such series;

	(d) material default in performance by the issuer or the guarantor, if any, of any other covenants or agreements in respect of the debt securities of such series contained in the applicable indenture or the debt securities for 60 days after written notice to the issuer and the guarantor, if any, or to the issuer, the guarantor, if any, and the trustee by the holders of at least 25% in aggregate principal amount of the debt securities of such series then outstanding;

	(e) there shall have occurred a default in the payment of the principal or premium, if any, of any bond, debenture, note or other evidence of indebtedness of the issuer or the guarantor, if any, in each case for money borrowed, or in the payment of principal or premium, if any, under any mortgage, indenture, agreement or instrument under which there may be issued or by which there may be secured or evidenced any indebtedness of the issuer or the guarantor, if any, for money borrowed (including any other series of debt securities issued under the indenture), which default for payment of principal or premium, if any, is in an aggregate principal amount exceeding $50,000,000 (or its equivalent in any other currency or currencies) when such indebtedness becomes due and payable (whether at maturity, upon redemption or acceleration or otherwise), if such default shall continue unremedied or unwaived for more than 30 business days after the expiration of any grace period or extension of the time for payment applicable thereto;


	(f) certain events of bankruptcy, insolvency and reorganization with respect to the issuer or guarantor, if any; and

	(g) the guarantee, if any, ceases to be in full force and effect (other than in accordance with terms of the guarantee agreement) or the guarantor denies or disaffirms its obligations under the guarantee.

An Event of Default under one series of debt securities does not necessarily constitute an Event of Default under any other series of debt securities.

The indentures provide that if an Event of Default occurs and is continuing with respect to any series of debt securities, either the trustee or the registered holders of at least 25% in aggregate principal amount of that series of debt securities, may declare the principal amount of those debt securities and any accrued and unpaid interest on those debt securities to be due and payable immediately. At any time after a declaration of acceleration, but before a judgment or decree for payment of money has been obtained, if all Events of Default with respect to those debt securities have been cured (other than the nonpayment of principal of such debt securities which has become due solely by reason of the declaration of acceleration) then the declaration of acceleration shall be automatically annulled and rescinded.

The indentures will require that the issuer and the guarantor, if any, file annually with the trustee a certificate describing any Default by the issuer or the guarantor, as the case may be, in the performance of any conditions or covenants that has occurred under the indentures and its status. See “— Covenants — Compliance Certificates,” above. The issuer and the guarantor, if any, must give the trustee written notice within 30 days of any Default under the indentures that could mature into an Event of Default described in clause (d), (e) or (f).

The trustee will be entitled under the indentures, subject to the duty of the trustee during a Default to act with the required standard of care, to be indemnified before proceeding to exercise any right or power under the indentures at the direction of the registered holders of the debt securities or which requires the trustee to expend or risk its own funds or otherwise incur any financial liability. The indentures will also provide that the registered holders of a majority in principal amount of the outstanding debt securities of any series issued under any indenture may direct the time, method and place of conducting any proceeding for any remedy available to the trustee or exercising any trust or power conferred on the trustee with respect to that series of debt securities. The trustee, however, may refuse to follow any such direction that conflicts with law or such indenture, is unduly prejudicial to the rights of other registered holders of that series of debt securities, or would involve the trustee in personal liability.

The indentures will provide that while the trustee generally must mail notice of a Default or Event of Default to the registered holders of the debt securities of any series issued under any indenture within 90 days of occurrence, the trustee may withhold notice of any Default or Event of Default (except in payment on the debt securities) if the trustee in good faith determines that the withholding of such notice is in the interest of the registered holders of that series of debt securities.

The issuer, the guarantor, if any, and the trustee may amend or supplement the indentures, including any guarantee agreement, if the holders of a majority in principal amount of the outstanding debt securities of each series of debt securities affected by the amendment or supplement consent to it, except that no amendment or supplement may, without the consent of each affected registered holder of that series:


	•	reduce the amount of principal the issuer has to repay or change the date of maturity;

	•	reduce the rate or change the time of payment of interest;

	•	change the currency of payment;

	•	modify any redemption or repurchase right to the detriment of the holder;

	•	reduce the percentage of the aggregate principal amount of debt securities needed to consent to an amendment or supplement;

	•	change the provisions of the indentures relating to waiver of past defaults, rights of registered holders of the debt securities to receive payments or the provisions relating to amendments of the indentures that require the consent of registered holders of each affected series; or


	•	release the guarantee, if any, except in compliance with the terms of the guarantee agreement and related indenture.

A holder of any series of debt securities may not pursue any remedy with respect to the indentures or the debt securities of such series (except a registered holder of a series of debt securities may bring an action for payment of overdue principal, premium, if any, or interest on that series), unless:


	•	the registered holder has given notice to the trustee of such series of a continuing Event of Default;

	•	registered holders of at least 25% in principal amount of that series of debt securities have made a written request to the trustee of such series to pursue such remedy;

	•	such registered holder or holders have offered the trustee of such series security or indemnity reasonably satisfactory to the trustee against any loss, liability or expense;

	•	the trustee of such series has not complied with such request within 60 days of such request and offer; and

	•	the registered holders of a majority in principal amount of that series of debt securities have not given the trustee of such series an inconsistent direction during that 60-day period.

Unless otherwise provided in the applicable indenture and described in the applicable prospectus supplement, the issuer may discharge the issuer and the guarantor, if any, from any and all obligations in respect of a series of debt securities, and the provisions of the related indenture will no longer be in effect with respect to that series of debt securities (except for, among other matters, certain obligations to register the transfer or exchange of those debt securities, to replace stolen, lost or mutilated debt securities, to maintain paying agencies and to hold monies for payment in trust, and the rights of holders of that series to receive payments of principal, premium, if any, and interest), on the 123rd day after the date of the deposit with the trustee, in trust, of money or U.S. Government Obligations that, through the payment of interest, principal and premium, if any, in respect thereof in accordance with their terms, will provide money, or a combination thereof, in an amount sufficient to pay the principal, premium, if any, and interest on that series of debt securities, when due in accordance with the terms of that indenture and those debt securities. Such a trust may only be established if, among other things,


	•	an opinion of counsel (who may not be an employee of ours) to the effect that registered holders of that series will not recognize income, gain or loss for federal income tax purposes as a result of such deposit, defeasance and discharge and will be subject to federal income tax on the same amount and in the same manner and at the same times as would have been the case if such deposit, defeasance and discharge had not occurred, which opinion of counsel must refer to and be based upon a ruling of the Internal Revenue Service or a change in applicable federal income tax law occurring after the date of that indenture; or

	•	a ruling of the Internal Revenue Service to such effect; and

(b) no Default under the indenture with respect to that series shall have occurred and be continuing on the date of such deposit or during the period ending on the 123rd day after such date of deposit and such deposit shall not result in or constitute a Default or result in a breach or violation of, or constitute a default under, any other agreement or instrument to which the issuer or the guarantor, if any, is a party or by which the issuer or the guarantor, if any, is bound.

“U.S. Government Obligations” are defined under the indentures as securities that are (x) direct obligations of the United States for the payment of which its full faith and credit is pledged or (y) obligations of a person controlled or supervised by and acting as an agency or instrumentality of the United States the payment of which is unconditionally guaranteed as a full faith and credit obligation by the United States and which, in either case, are not callable or redeemable before their maturity.

In addition, unless otherwise provided in the applicable indenture and described in the applicable prospectus supplement, with respect to a series of debt securities issued under an indenture, the provisions of that indenture described under “— Covenants — Limitation on Liens,” above, and “— Covenants — Limitation on Sale/ Leaseback Transactions,” above, will no longer be in effect, clauses (c) (with respect to such covenants) and (d) under “— Events of Default,” above, shall be deemed not to be Events of Default under that indenture, and the provisions described herein under “— Ranking,” above, shall not apply, upon the deposit with the trustee, in trust, of money or U.S. Government Obligations that through the payment of interest and principal in respect thereof in accordance with their terms will provide money in an amount sufficient to pay the principal, premium, if any, and interest on that series of debt securities when due in accordance with the terms of that indenture. Such a trust may only be established if, among other things, the provisions described in clause (b) of the immediately preceding paragraph have been satisfied and the issuer has delivered to the trustee an opinion of counsel (who may not be an employee of ours) to the effect that the registered holders of that series will not recognize income, gain or loss for federal income tax purposes as a result of such deposit and defeasance, and will be subject to federal income tax on the same amount and in the same manner and at the same times as would have been the case if such deposit and defeasance had not occurred.

In the event the issuer exercises its option not to comply, or to discharge the guarantor, if any, from compliance, with the covenants and certain other provisions of an indenture with respect to a series of debt securities as described in the immediately preceding paragraph, and that series of debt securities are declared due and payable because of the occurrence of an Event of Default that remains applicable, while the amount of money or U.S. Government Obligations on deposit with the trustee will be sufficient to pay principal of and interest on that series on the respective dates on which such amounts are due, they may not be sufficient to pay amounts due on that series at the time of the acceleration resulting from such Event of Default. However, the issuer and the guarantor, if any, shall remain liable for such payments.

Unless otherwise provided in the applicable indenture and described in the applicable prospectus supplement, the issuer may discharge the issuer and the guarantor, if any, from any and all obligations in respect of a series of debt securities and the provisions of the related indenture will no longer be in effect with respect to that series of debt securities (except to the extent provided under “— Defeasance and Discharge,” above) if that series of debt securities mature within one year and the issuer deposits with the trustee, in trust, money or U.S. Government Obligations that, through the payment of interest and principal in respect thereof in accordance with their terms, will provide money in an amount sufficient to pay the principal of, premium, if any, and accrued interest on that series of debt securities when due in accordance with the terms of that indenture and the debt securities. Such a trust may only be established if, among other things,


	•	no Default under the indenture with respect to that series shall have occurred and be continuing on the date of such deposit;

	•	such deposit will not result in or constitute a Default or result in a breach or violation of, or constitute a Default under, any other agreement or instrument to which the issuer or the guarantor, if any, is a party or by which the issuer or the guarantor, if any, is bound; and

	•	the issuer has delivered to the trustee an opinion of counsel stating that such conditions have been complied with.

Pursuant to this provision, the issuer is not required to deliver an opinion of counsel to the effect that registered holders of that series will not recognize income, gain or loss for U.S. federal income tax purposes as a result of such deposit and termination, and there is no assurance that registered holders of that series would not recognize income, gain or loss for U.S. federal income tax purposes as a result thereof or that they would be subject to U.S. federal income tax on the same amount and in the same manner and at the same times as would have been the case if such deposit and termination had not occurred.

Subject to any applicable abandoned property law, the indentures will provide that the trustee will pay to the issuer upon request any money held by the trustee for the payment of principal, premium, if any, or

Wilmington Trust Company will initially act as Trustee and paying agent for the debt securities. Wilmington Trust Company currently acts as trustee under:


	•	an indenture with Calpine and Calpine’s subsidiary, Calpine Capital Trust III, dated as of August 9, 2000;

	•	an indenture with Calpine, dated as of August 10, 2000, as supplemented by the First Supplemental Indenture, dated as of September 28, 2000;

	•	an indenture with Calpine, dated as of April 30, 2001;

	•	three indentures with Calpine, dated as of July 16, 2003;

	•	an indenture with Calpine, dated as of November 18, 2003, as amended and restated on March 12, 2004;

	•	an indenture with Energy Finance, dated as of April 25, 2001, as amended and restated on October 16, 2001;

	•	an indenture with Energy Finance II, dated as of October 18, 2001, as supplemented by the First Supplemental Indenture, dated as of October 18, 2001;

	•	an indenture with Power Contract Financing L.L.C., a Calpine subsidiary, dated as of June 13, 2003;

	•	an indenture with Power Contract Financing III, LLC, a Calpine subsidiary, dated as of June 2, 2004;

	•	an indenture with Calpine Construction Finance Company, L.P. and CCFC Finance Corp., both Calpine subsidiaries, and each of Calpine Hermiston, LLC, CPN Hermiston, LLC and Hermiston Power Partnership, each a Calpine subsidiary, as guarantors, dated as of August 14, 2003, as supplemented by the Supplemental Indenture, dated as of September 18, 2003, the Second Supplemental Indenture, dated as of January 14, 2004, and the Third Supplemental Indenture, dated as of March 5, 2004;

	•	an indenture with Gilroy Energy Center, LLC, a Calpine subsidiary, and Creed Energy Center, LLC and Goose Haven Energy Center, both Calpine subsidiaries, as guarantors, dated September 30, 2003; and

	•	first priority, second priority and third priority indentures, each dated as of March 23, 2004, with Calpine Generating Company, LLC and CalGen Finance Corp, both Calpine subsidiaries.

We will describe in the prospectus supplement any material business and other relationships (including additional trusteeships), other than the trusteeship under the indentures, between us and any of our affiliates, on the one hand, and each trustee and paying agent under the indentures, on the other hand.

The holders of a majority in principal amount of the outstanding senior notes will have the right to direct the time, method and place of conducting any proceeding for exercising any remedy available to the trustee, subject to certain exceptions. If an event of default occurs (and is not cured), the trustee will be required, in the exercise of its power, to use the degree of care of a prudent man in the conduct of his own affairs. Subject to such provisions, the trustee will be under no obligation to exercise any of its rights or powers under the indenture at the request of any holder of senior notes, unless such holder shall have offered to the trustee security and indemnity satisfactory to the trustee against any loss, liability or expense and then only to the extent required by the terms of the indenture.

The registered office of the trustee is Rodney Square North, 1100 North Market Street, Wilmington, Delaware.

The laws of the State of New York will govern the indentures and each series of debt securities.

Unless otherwise specified in the prospectus supplement, each series of debt securities will be represented by one or more global notes registered in the name of a nominee of The Depository Trust Company (“DTC”), as depositary. Upon the issuance of the global notes, DTC or its custodian will credit, on its internal system, the respective principal amount of the individual beneficial interests represented by the global notes to the accounts of persons who have accounts with DTC. Each account initially will be designated by or on behalf of the underwriters, dealer or agents. Ownership of beneficial interests in a global note will be limited to persons who have accounts with DTC (“participants”) or persons who hold interests through participants. Ownership of beneficial interests in the global notes will be shown on, and transfers of their ownership may be effected only through, records maintained by DTC or its nominee (with respect to interests of participants) and the records of participants (with respect to interests of persons other than participants). DTC currently limits the maximum denomination of any single global note to $400,000,000.

So long as DTC or its nominee is the registered owner or holder of the global notes, DTC or such nominee, as the case may be, will be considered the sole owner or holder of the debt securities represented by such global notes for all purposes under the applicable indenture and the debt securities. No beneficial owner of an interest in the global notes will be able to transfer that interest except in accordance with DTC’s applicable procedures, in addition to those provided for under the indenture.

Payments of the principal of, and interest on, the global notes will be made to DTC or its nominee, as the case may be, as the registered owner of the global notes. Neither we, the trustee or any paying agent will have any responsibility or liability for any aspect of the records relating to or payments made on account of beneficial ownership interests in the global notes or for maintaining, supervising or reviewing any records relating to such beneficial ownership interests.

We expect that DTC or its nominee, upon receipt of any payment of principal or interest in respect of the global notes will credit participants’ accounts with payments in amounts proportionate to their respective beneficial interests in the principal amount of the global notes as shown on the records of DTC or its nominee. We also expect that payments by participants to owners of beneficial interests in the global notes held through such participants will be governed by standing instructions and customary practices, as is now the case with securities held for the accounts of customers registered in the names of nominees for such customers. Such payments will be the responsibility of such participants.

Transfers between participants in DTC will be effected in the ordinary way in accordance with DTC rules and will be settled in same-day funds. If a holder requires physical delivery of a certificated note for any reason, including to sell debt securities to persons in states which require delivery of certificated notes or to pledge their debt securities, such holder must transfer its interest in the global notes in accordance with the normal procedures of DTC and the procedures set forth in the indenture.

DTC has advised us that it will take any action permitted to be taken by a holder of a series of debt securities (including the presentation of debt securities for exchange as described below) only at the direction of one or more participants to whose account the DTC interests in the global notes relating to such series is credited and only in respect of such portion of the aggregate principal amount of debt securities as to which such participant or participants has or have given such direction. However, if there is an Event of Default under a series of debt securities, DTC will exchange the global notes relating to such series for certificated notes which it will distribute to its participants.

DTC has advised us as follows: DTC is a limited purpose trust company organized under the laws of the State of New York, a “banking organization” within the meaning of New York Banking Law, a member of the Federal Reserve System, a “clearing corporation” within the meaning of the Uniform Commercial Code and a “Clearing Agency” registered pursuant to the provisions of Section 17A of the Securities Exchange Act. DTC was created to hold securities for its participants and facilitate the clearance and settlement of securities transactions between participants through electronic book-entry changes in accounts of its participants, thereby eliminating the need for physical movement of certificates. Participants include securities brokers and dealers, banks, trust companies and clearing corporations and certain other organizations. Indirect access to

Although DTC has agreed to the foregoing procedures in order to facilitate transfers of interest in the global notes among participants of DTC, it is under no obligation to perform or continue to perform such procedures, and such procedures may be discontinued at any time. Neither we nor the trustee will have any responsibility for the performance by DTC or its respective participants or indirect participants of their respective obligations under the rules and procedures governing their operations.

If DTC is at any time unwilling or unable to continue as a depositary for the global notes and a successor depositary is not appointed by us within 90 days, or if the issuer otherwise chooses to issue definitive debt securities, the issuer will issue certificated notes in exchange for the global notes. In either instance, an owner of a beneficial interest in a global note will be entitled to have debt securities equal in principal amount to such beneficial interest registered in its name and will be entitled to physical delivery of debt securities in definitive form. Debt securities in definitive form will be issued in denominations of $1,000 and integral multiples of $1,000 and will be issued in registered form only, without coupons. The issuer will maintain in the Borough of Manhattan, The City of New York, one or more offices or agencies where debt securities may be presented for payment and may be transferred or exchanged. You will not be charged a fee for any transfer or exchange of your debt securities, but the issuer may require payment of a sum sufficient to cover any tax or other governmental charge payable in connection therewith.

Global notes held by DTC will trade in DTC’s Same-Day Funds Settlement System until maturity and secondary market trading activity in the debt securities will settle in immediately available funds. No assurance can be given as to the effect, if any, of settlement in immediately available funds on the trading activity in the debt securities.


	•	debt or equity securities issued by us or securities issued by third parties, a basket of such securities, an index or indices of such securities or any combination of the above as specified in the applicable prospectus supplement;

	•	currencies; or

	•	commodities.

Each purchase contract will entitle the holder thereof to purchase or sell, and obligate us to sell or purchase, on specified dates, such securities, currencies or commodities at a specified purchase price, which may be based on a formula. We may, however, satisfy our obligations, if any, with respect to any purchase contract by delivering the cash value of such purchase contract or the cash value of the property otherwise deliverable or, in the case of purchase contracts on underlying currencies, by delivering the underlying currencies.

The purchase contracts may require Calpine to make periodic payments to the holders thereof or vice versa, which payments may be deferred to the extent set forth in the applicable prospectus supplement, and may be unsecured or prefunded on some basis. The purchase contracts may require the holders thereof to secure their obligations in a manner specified in the applicable prospectus supplement. Alternatively, purchase contracts may require holders to satisfy their obligations thereunder when the purchase contracts are issued. Our obligation to settle such pre-paid purchase contracts on the relevant settlement date may constitute indebtedness. Accordingly, pre-paid purchase contracts will be issued under an indenture.

The applicable prospectus supplement will describe the terms of the purchase contracts, including the methods by which the holders may purchase or sell such securities, currencies or commodities and any acceleration, cancellation or termination provisions or other provisions relating to the settlement of a purchase contract. The description in the prospectus supplement will not necessarily be complete, and reference will be made to the purchase contracts, and any other applicable documents or instruments relating to the purchase contracts. Any such purchase contract, and any other document or instrument relevant to a purchase contract, will be filed as an exhibit to, or incorporated by reference in, the registration statement of which this prospectus is a part at the time of the offering thereof. Material United States federal income tax considerations applicable to the purchase contracts will also be discussed in the applicable prospectus supplement.

We may issue units comprised of one or more shares of common stock, shares of preferred stock, debt securities, warrants, trust preferred securities or debt obligations of third parties, including U.S. treasury securities, in any combination. The applicable prospectus supplement will describe:


	•	the terms of the units and of the securities comprising the units, including whether and under what circumstances the securities comprising the units may be held or transferred separately;

	•	any provisions for the issuance, payment, settlement, transfer or exchange of the units or of the securities comprising the units;

	•	certain material United States federal income tax considerations applicable to the units; and

	•	the terms of any unit agreement governing the units.

The description in the prospectus supplement will not necessarily be complete, and reference will be made to any unit, collateral or depositary agreements relating to the units. Any such agreements, and any other document or instrument relevant to the units, will be filed as an exhibit to, or incorporated by reference in, the registration statement of which this prospectus is a part at the time of the offering thereof.

The following is a general description of the warrants to which this prospectus and any prospectus supplement may relate. The applicable prospectus supplement will describe the specific terms of the securities warrants offered through that prospectus supplement, as well as any general terms described in this section that will not apply to those securities warrants.

Calpine may issue warrants for the purchase of Calpine’s common stock, preferred stock, debt securities, purchase contracts, units or any combination thereof, as well as other types of warrants. Energy Finance and Energy Finance II may each issue warrants for the purchase of their respective debt securities. For purposes of this section, references to the “issuer” are to Calpine, in the case of warrants issued by Calpine, to Energy Finance, in the case of warrants issued by Energy Finance, and to Energy Finance II, in the case of warrants issued by Energy Finance II.

Warrants may be issued independently or together with other securities, and they may be attached to or separate from the other securities. Each series of warrants will be issued under a separate warrant agreement that the issuer will enter into with a bank or trust company that the issuer selects as warrant agent, as detailed in the applicable prospectus supplement. The warrant agent will act solely as an agent of the issuer in connection with the warrants and will not assume any obligation, or agency or trust relationship, with the holders of the warrants. The warrant agreements, including the forms of warrant certificates, will be filed as an exhibit to, or incorporated by reference in, the registration statement of which this prospectus is a part. You should refer to the provisions of the warrant agreements for more specific information. Until you exercise your warrants, you will not have any rights as a holder of the underlying securities by virtue of your ownership of those warrants.

The prospectus supplement relating to a particular issue of warrants will describe the terms of those warrants, including the following:


	•	the title of such warrants;

	•	the aggregate number of such warrants;

	•	the price or prices at which such warrants will be issued;

	•	the currency or currencies, including composite currencies, in which the price of such warrants may be payable;

	•	the designation and terms of the securities purchasable upon exercise of such warrants;

	•	the price at which and the currency or currencies, including composite currencies, in which the securities purchasable upon exercise of such warrants may be purchased;

	•	the date on which the right to exercise such warrants shall commence and the date on which such right shall expire;

	•	whether such warrants will be issued in registered form or bearer form;

	•	if applicable, the minimum or maximum amount of such warrants that may be exercised at any one time;

	•	if applicable, the designation and terms of the securities with which such warrants are issued and the number of such warrants issued with each such security;

	•	if applicable, the date on and after which such warrants and the related securities will be separately transferable;

	•	information with respect to book-entry procedures, if any;

	•	a discussion of certain material United States federal income tax considerations; and

	•	any other terms of such warrants, including terms, procedures and limitations relating to the exchange and exercise of such warrants.

The following is a general description of the trust preferred securities and related guarantee to which this prospectus and any prospectus supplement may relate. The applicable prospectus supplement will describe the specific terms of the trust preferred securities and guarantee offered through that prospectus supplement, as well as any general terms described in this section that will not apply to those trust preferred securities.

Each of Trust IV and Trust V may issue from time to time trust preferred securities representing undivided beneficial interests in the assets of the trust under its declaration of trust, as it may be amended and restated from time to time. Such trust preferred securities will be fully and unconditionally guaranteed by Calpine. Each trust will use the proceeds from the sale of its trust preferred securities to purchase debt securities from Calpine, which may be distributed to holders of the trust preferred and trust common securities either upon dissolution of the trust or upon the occurrence of events that will be described in the applicable prospectus supplement. When a trust issues its trust preferred securities, you and the other holders of the trust preferred securities will own all of the issued and outstanding trust preferred securities of the trust. Calpine will acquire all of the issued and outstanding trust common securities of each trust, representing an undivided beneficial interest in the assets of the trust of at least 3%.

The following description of trust preferred securities and related guarantees is subject to the detailed provisions of the applicable declaration of trust (as it may be amended and restated from time to time) and guarantee. A copy of the applicable declaration of trust will be filed as an exhibit to, or incorporated by reference in, the registration statement of which this prospectus is a part at the time of the offering of securities pursuant thereto. The form of the guarantee has been filed as an exhibit to the registration statement of which this prospectus is a part. Whenever particular provisions of a declaration of trust or guarantee, or terms defined therein, are referred to, those provisions or definitions are incorporated by reference herein and such descriptions are qualified in their entirety by such reference. We urge you to read the declaration of trust and the guarantee because they, and not this description, describe every detail of the terms of the trust preferred securities and related guarantees.

The prospectus supplement relating to the issuance of trust preferred securities by a trust will include specific terms relating to the offering. These terms will include some or all of the following:


	•	the designation of the trust preferred securities;

	•	the number of trust preferred securities issued by the trust;

	•	the annual distribution rate and any conditions upon which distributions are payable, the distribution payment dates, the record dates for distribution payments and the additional amounts, if any, that may be payable with respect to the trust preferred securities;

	•	whether distributions will be cumulative and compounding and, if so, the dates from which distributions will be cumulative or compounded;

	•	the amounts that will be paid out of the assets of the trust, after the satisfaction of liabilities to creditors of the trust, to the holders of trust preferred securities upon dissolution;

	•	any repurchase, redemption or exchange provisions;

	•	any preference or subordination rights upon a default or liquidation of the trust;

	•	any voting rights of the trust preferred securities in addition to those required by law;

	•	terms for any conversion or exchange of the debt securities or the trust preferred securities into other securities;

	•	any rights to defer distributions on the trust preferred securities by extending the interest payment period on the debt securities; and

	•	any other relevant terms, rights, preferences, privileges, limitations or restrictions of the trust preferred securities.

The administrative trustees, on behalf of the trust and pursuant to the declaration of trust, will issue one class of trust preferred securities and one class of trust common securities. The trust securities will represent undivided beneficial ownership interests in the assets of the trust.

Except as described in the applicable prospectus supplement, the trust preferred securities will rank equally, and payments will be made thereon proportionately, with the trust common securities. The property trustee of the trust will hold legal title to the debt securities in trust for the benefit of the holders of the trust securities. Calpine will execute a guarantee agreement for the benefit of the holders of the trust preferred securities. The guarantee will not guarantee the payment of distributions (as defined below) or any amounts payable on redemption or liquidation of the trust preferred securities when the trust does not have funds on hand available to make such payments.

The applicable prospectus supplement will also describe certain material United States federal income tax consequences and special considerations applicable to the trust preferred securities.

Calpine will fully and unconditionally guarantee payments on the trust preferred securities of each of the trusts, as described in this section. The guarantee covers the following payments:


	•	periodic cash distributions on the trust preferred securities out of funds held by the property trustee of the trust;

	•	payments on dissolution of the trust; and

	•	payments on redemption of trust preferred securities of the trust.

Wilmington Trust Company, as guarantee trustee, will hold the guarantee for the benefit of the holders of trust preferred securities.

Selected provisions of the guarantee are summarized below. This summary is not complete. For a complete description, we encourage you to read the guarantee, the form of which has been filed as an exhibit to the registration statement of which this prospectus is a part.

Calpine will irrevocably and unconditionally agree to pay you in full the following amounts to the extent not paid by a trust:


	•	any accumulated and unpaid distributions and any additional amounts with respect to the trust preferred securities and any redemption price for trust preferred securities called for redemption by the trust, if and to the extent that Calpine has made corresponding payments on the debt securities to the property trustee of the trust;

	•	payments upon the dissolution of the trust equal to the lesser of: (a) the liquidation amount plus all accumulated and unpaid distributions and additional amounts on the trust preferred securities to the extent the trust has funds legally available for those payments; and (b) the amount of assets of the trust remaining legally available for distribution to the holders of trust preferred securities in liquidation of the trust.


	•	the trust distributes the debt securities to the holders of trust preferred securities in exchange for their trust preferred securities; or

	•	the trust redeems the trust preferred securities in full upon the maturity or redemption of the debt securities.

Calpine may satisfy its obligation to make a guarantee payment either by making payment directly to the holders of trust preferred securities or to the guarantee trustee for remittance to the holders or by causing applicable trust to make the payment to them.

Each guarantee is a guarantee from the time of issuance of the applicable series of trust preferred securities. THE GUARANTEE ONLY COVERS, HOWEVER, DISTRIBUTIONS AND OTHER PAYMENTS ON TRUST PREFERRED SECURITIES IF AND TO THE EXTENT THAT CALPINE HAS MADE CORRESPONDING PAYMENTS ON THE DEBT SECURITIES TO THE APPLICABLE PROPERTY TRUSTEE. IF CALPINE DOES NOT MAKE THOSE CORRESPONDING PAYMENTS ON THE DEBT SECURITIES, THE APPLICABLE TRUST WILL NOT HAVE FUNDS AVAILABLE FOR PAYMENTS AND CALPINE WILL HAVE NO OBLIGATION TO MAKE A GUARANTEE PAYMENT.

Calpine’s obligations under the declaration of trust for each trust, the guarantee, the debt securities and the associated indenture taken together will provide a full and unconditional guarantee of payments due on the trust preferred securities. We will describe the specific terms of the guarantee in a prospectus supplement.

In each guarantee, Calpine will agree that, as long as trust preferred securities issued by any trust are outstanding, it will:


	•	remain the sole direct or indirect owner of all the outstanding common securities of that trust, except as permitted by the applicable declaration of trust;

	•	permit the trust common securities of that trust to be transferred only as permitted by the declaration of trust; and

	•	use reasonable efforts to cause that trust to continue to be treated as a grantor trust for United States federal income tax purposes, except in connection with a distribution of debt securities to the holders of trust preferred securities as provided in the declaration of trust, in which case the trust would be dissolved.

Calpine and the guarantee trustee may amend each guarantee without the consent of any holder of trust preferred securities if the amendment does not adversely affect the rights of the holders in any material respect. In all other cases, Calpine and the guarantee trustee may amend each guarantee only with the prior approval of the holders of at least a majority of outstanding trust preferred securities issued by the applicable trust.

Calpine may assign its obligations under the guarantees only in connection with a consolidation, merger or asset sale involving Calpine that is permitted under the indenture governing the debt securities.


	•	full payment of the redemption price of all trust preferred securities of the applicable trust;

	•	distribution of the related debt securities, or any securities into which those debt securities are convertible, to the holders of the trust preferred securities and trust common securities of that trust in exchange for all the securities issued by that trust; or

	•	full payment of the amounts payable upon liquidation of that trust.

Each guarantee will, however, continue to be effective or will be reinstated if any holder of trust preferred securities must repay any amounts paid on those trust preferred securities or under the guarantee.

Calpine’s obligations under each guarantee will be unsecured and effectively junior to all debt and preferred stock of its subsidiaries. BY YOUR ACCEPTANCE OF THE TRUST PREFERRED SECURITIES, YOU AGREE TO ANY SUBORDINATION PROVISIONS AND OTHER TERMS OF THE RELATED GUARANTEE. We will specify in a prospectus supplement the ranking of each guarantee with respect to Calpine’s capital stock and other liabilities, including other guarantees.

Each guarantee will be deposited with the guarantee trustee to be held for your benefit. The guarantee trustee will have the right to enforce the guarantee on your behalf. In most cases, the holders of a majority of outstanding trust preferred securities issued by the applicable trust will have the right to direct the time, method and place of:


	•	conducting any proceeding for any remedy available to the applicable guarantee trustee; or

	•	exercising any trust or other power conferred upon that guarantee trustee under the applicable guarantee.

Each guarantee will constitute a guarantee of payment and not merely of collection. This means that the guarantee trustee may institute a legal proceeding directly against Calpine to enforce the payment rights under the guarantee without first instituting a legal proceeding against any other person or entity.

If the guarantee trustee fails to enforce the guarantee or Calpine fails to make a guarantee payment, you may institute a legal proceeding directly against Calpine to enforce your rights under that guarantee without first instituting a legal proceeding against the applicable trust, the guarantee trustee or any other person or entity.

Calpine will be required to provide annually to the guarantee trustee a statement as to its performance of its obligations and its compliance with all conditions under the guarantees.

The guarantee trustee normally will perform only those duties specifically set forth in the applicable guarantee. The guarantees do not contain any implied covenants. If a default occurs on a guarantee, the guarantee trustee will be required to use the same degree of care and skill in the exercise of its powers under the guarantee as a prudent person would exercise or use under the circumstances in the conduct of his own affairs. The guarantee trustee will exercise any of its rights or powers under the guarantee at the request or direction of holders of the applicable series of trust preferred securities only if it is offered security and indemnity satisfactory to it.

Relationship Among the Trust Preferred Securities, the Debt Securities and the Trust Preferred Securities Guarantee

To the extent set forth in the guarantee and to the extent funds are available, Calpine will irrevocably guarantee the payment of distributions and other amounts due on the trust securities. If and to the extent we do not make payments on the debt securities, the trust will not have sufficient funds to pay distributions or other amounts due on the trust securities. The guarantee does not cover any payment of distributions or other amounts due on the trust securities unless the trust has sufficient funds for the payment of such distributions or other amounts. In such event, a holder of trust securities may institute a legal proceeding directly against us to enforce payment of such distributions or other amounts to such holder after the respective due dates. Taken together, our obligations under the declaration of trust for each trust, the debt securities, the indenture and the guarantee provide a full and unconditional guarantee of payments of distributions and other amounts due on the trust securities. No single document standing alone or operating in conjunction with fewer than all of the other documents constitutes such guarantee. It is only the combined operation of these documents that provides a full and unconditional guarantee of the trust’s obligations under the trust securities.

As long as payments of interest and other amounts are made when due on the debt securities, such payments will be sufficient to cover distributions and payments due on the trust securities of a trust because of the following factors:


	•	the aggregate principal amount of the debt securities will be equal to the sum of the aggregate stated liquidation amount of the trust securities;

	•	the interest rate and the interest and other payment dates on the debt securities will match the distribution rate and distribution and other payment dates for the trust securities;

	•	Calpine, as issuer of the debt securities, will pay, and the trust will not be obligated to pay, directly or indirectly, any costs, expenses, debts and obligations of the trust (other than with respect to the trust securities); and

	•	the declaration of trust further provides that the trust will not engage in any activity that is not consistent with the limited purposes of the trust.

Notwithstanding anything to the contrary in the indenture, we have the right to set-off any payment we are otherwise required to make thereunder against and to the extent we have already made, or are concurrently on the date of such payment making, a related payment under the guarantee.

The declaration of trust provides that if we fail to make interest or other payments on the debt securities when due (taking account of any extension period), the holders of the trust preferred securities may direct the property trustee to enforce its rights under the applicable indenture. If the property trustee fails to enforce its rights under the indenture in respect of an event of default under the indenture, any holder of record of trust preferred securities may, to the fullest extent permitted by applicable law, institute a legal proceeding against us to enforce the property trustee’s rights under the indenture without first instituting any legal proceeding against the property trustee or any other person or entity. Notwithstanding the foregoing, if a trust enforcement event has occurred and is continuing and such event is attributable to our failure to pay interest, premium or principal on the debt securities on the date such interest, premium or principal is otherwise payable, then a holder of trust preferred securities may institute a direct action against us for payment of such holder’s pro rata share. If a holder brings such a direct action, we will be entitled to that holder’s rights under the applicable declaration of trust to the extent of any payment made by us to that holder.

If we fail to make payments under the guarantee, a holder of trust preferred securities may institute a proceeding directly against us for enforcement of the guarantee for such payments.

The trust preferred securities evidence undivided beneficial ownership interests in the assets of the trust, and the trust exists for the sole purpose of issuing and selling the trust securities and using the proceeds to purchase our debt securities. A principal difference between the rights of a holder of trust preferred securities and a holder of debt securities is that a holder of debt securities is entitled to receive from us the principal amount of and interest accrued on the debt securities held, while a holder of trust preferred securities is entitled to receive distributions and other payments from the trust (or from us under the guarantee) only if and to the extent the trust has funds available for the payment of such distributions and other payments.

Upon any voluntary or involuntary dissolution of the trust involving the redemption or repayment of the debt securities, the holders of the trust securities will be entitled to receive, out of assets held by the trust, subject to the rights of creditors of the trust, if any, the liquidation distribution in cash. Because Calpine is the guarantor under the guarantee and, as issuer of the debt securities, Calpine has agreed to pay for all costs, expenses and liabilities of the trust (other than the trust’s obligations to the holders of the trust securities), the positions of a holder of trust securities and a holder of debt securities relative to other creditors and to our stockholders in the event of liquidation or bankruptcy of Calpine would be substantially the same.

The financial statements of any trust issuing securities will be consolidated with our financial statements, with the trust preferred securities shown on our consolidated financial statements as Calpine-obligated mandatorily redeemable preferred capital trust securities of a subsidiary trust holding solely Calpine debt securities. Our financial statements will include a footnote that discloses, among other things, that the assets of the trust consist of our debt securities and will specify the designation, principal amount, interest rate and maturity date of the debt securities.

The following is a summary of the material United States federal income tax consequences of the ownership and disposition of our common stock, preferred stock and debt securities and of the debt securities of Energy Finance and Energy Finance II offered hereunder. A summary of the material United States federal income tax consequences of the ownership and disposition of the other securities offered hereunder will be provided in the applicable prospectus supplement, as will any information that updates or changes the information provided below.

Unless otherwise stated, this summary deals only with common stock, preferred stock or debt securities purchased for cash and held as capital assets by U.S. holders. As used herein, “U.S. holders” are any beneficial owners of the common stock, preferred stock or debt securities, that are, for United States federal income tax purposes, (i) citizens or residents of the United States, (ii) corporations created or organized in, or under the laws of, the United States, any state thereof or the District of Columbia, (iii) estates, the income of which is subject to United States federal income taxation regardless of its source, or (iv) trusts if (a) a court within the United States is able to exercise primary supervision over the administration of the trust and (b) one or more United States persons have the authority to control all substantial decisions of the trust. In addition, certain trusts in existence on August 20, 1996 and treated as a U.S. holder prior to such date may also be treated as U.S. holders. As used herein, “non-U.S. holders” are beneficial owners of the common stock, preferred stock or debt securities, other than partnerships, that are not U.S. holders. If a partnership (including for this purpose any entity treated as a partnership for United States federal tax purposes) is a beneficial owner of the common stock, preferred stock or debt securities, the treatment of a partner in the partnership will generally depend upon the status of the partner and upon the activities of the partnership. Partnerships and partners in such partnerships should consult their tax advisors about the United States federal income tax consequences of owning and disposing of the common stock, preferred stock or debt securities.

This summary does not describe all of the tax consequences that may be relevant to a holder in light of its particular circumstances. For example, it does not deal with special classes of holders such as banks, thrifts, real estate investment trusts, regulated investment companies, insurance companies, dealers and traders in securities or currencies, or tax-exempt investors. It also does not discuss stock or debt securities held as part of a hedge, straddle, “synthetic security” or other integrated transaction. This summary does not address the tax consequences to (i) persons that have a functional currency other than the U.S. dollar, (ii) U.S. holders who are resident or who carry on a trade or business in Canada, (iii) certain U.S. expatriates or (iv) stockholders, partners or beneficiaries of a holder of the common stock, preferred stock or debt securities. Further, it does not include any description of any alternative minimum tax consequences or the tax laws of any state or local government or of any foreign government that may be applicable to the common stock, preferred stock and debt securities.

This summary is based on the Internal Revenue Code of 1986, as amended, the Treasury regulations promulgated thereunder and administrative and judicial interpretations thereof, all as of the date hereof, and all of which are subject to change or differing interpretations, possibly on a retroactive basis.

You should consult with your own tax advisor regarding the federal, state, local and foreign income, franchise, personal property, and any other tax consequences of the ownership and disposition of the common stock, preferred stock or debt securities.

This subsection describes certain of the material United States federal income tax consequences of owning and disposing of the common stock that Calpine may offer.

The amount of any distribution Calpine makes in respect of its common stock will be equal to the amount of cash and the fair market value, on the date of distribution, of any property distributed. Generally, distributions will be treated as a dividend to the extent of Calpine’s current or accumulated earnings and profits, then as a tax-free return of capital to the extent of a holder’s tax basis in the common stock and thereafter as gain from the sale or exchange of such stock as described below.

In general, a dividend distribution to a corporate holder will qualify for the dividends-received deduction. The dividends-received deduction is subject to certain holding period, taxable income, and other limitations (see “— Taxation of Preferred Stock — U.S. Holders of Preferred Stock — Dividends to Corporate Holders,” below).

Dividends received by an individual taxpayer during taxable years before 2009 will be taxed at a maximum rate of 15%, provided the taxpayer held the stock for more than 60 days during a specified period of time and certain other requirements are met. Dividends received by an individual taxpayer for taxable years after 2008 will be subject to tax at ordinary income rates.

Upon the sale or exchange of common stock, a holder generally will recognize capital gain or loss equal to the difference between (i) the amount of cash and the fair market value of any property received upon the sale or exchange and (ii) such holder’s adjusted tax basis in the common stock. A holder’s basis in the common stock is generally equal to its initial purchase price. In the case of a holder other than a corporation, preferential tax rates may apply to such gain if the holder’s holding period for the common stock exceeds one year. Subject to certain limited exceptions, capital losses cannot be applied to offset ordinary income for United States federal income tax purposes.

In general, information reporting requirements will apply to payments of dividends on common stock and payments of the proceeds of the sale of common stock, and a backup withholding tax may apply to such payments if the holder fails to comply with certain identification requirements. Back-up withholding is currently imposed at a rate of 28%. Any amounts withheld under the backup withholding rules from a payment to a holder will be allowed as a credit against such holder’s United States federal income tax and may entitle the holder to a refund, provided that the required information is furnished to the Internal Revenue Service.

The rules governing United States federal income taxation of a non-U.S. holder of common stock are complex and no attempt will be made herein to provide more than a summary of such rules. Non-U.S. holders should consult with their own tax advisors to determine the effect of federal, state, local and foreign tax laws, as well as treaties, with regard to an investment in the common stock, including any reporting requirements.

Distributions by Calpine with respect to common stock that are treated as dividends paid, as described above under “Distributions,” to a non-U.S. holder (excluding dividends that are effectively connected with the conduct of a United States trade or business by such holder and are taxable as described below) will be subject to United States federal withholding tax at a 30% rate (or a lower rate provided under an applicable income tax treaty). Except to the extent that an applicable income tax treaty otherwise provides, a non-U.S. holder will be taxed in the same manner as a U.S. holder on dividends paid (or deemed paid) that are effectively connected with the conduct of a United States trade or business by the non-U.S. holder. If such non-U.S. holder is a foreign corporation, it may also be subject to a United States branch profits tax on such effectively connected income at a 30% rate (or such lower rate as may be specified by an applicable income tax treaty). Even though such effectively connected dividends are subject to income tax and may be subject to the branch profits tax, they will not be subject to United States federal withholding tax if the holder delivers a properly executed Internal Revenue Service Form W-8ECI (or successor form) to the payor or the payor’s agent.

A non-U.S. holder who wishes to claim the benefit of an applicable income tax treaty is required to satisfy certain certification and other requirements. If you are eligible for a reduced rate of United States withholding tax pursuant to an income tax treaty, you may obtain a refund of any excess amounts withheld by filing an appropriate claim for refund with the Internal Revenue Service.

A non-U.S. holder generally will not be subject to United States federal income tax or withholding tax on the sale or exchange of common stock unless (i) the gain is effectively connected with a United States trade or

business of the non-U.S. holder, (ii) in the case of a non-U.S. holder who is an individual, such holder is present in the United States for a period or periods aggregating 183 days or more during the taxable year of the disposition, and either (a) such holder has a “tax home” in the United States or (b) the disposition is attributable to an office or other fixed place of business maintained by such holder in the United States, or (iii) in the event that Calpine is characterized as a United States real property holding corporation and the non-U.S. holder does not qualify for certain exemptions (see discussion below under “Foreign Investment in Real Property Tax Act”).

Except to the extent that an applicable income tax treaty otherwise provides, (1) if an individual non-U.S. holder falls under clause (i) above, such individual generally will be taxed on the net gain derived from a sale in the same manner as a U.S. holder and (2) if an individual non-U.S. holder falls under clause (ii) above, such individual generally will be subject to a flat 30% tax on the gain derived from a sale, which may be offset by certain United States capital losses (notwithstanding the fact that such individual is not considered a resident of the United States). Individual non-U.S. holders who have spent (or expect to spend) 183 days or more in the United States in the taxable year in which they contemplate a disposition of common stock are urged to consult their tax advisors as to the tax consequences of such disposition. If a non-U.S. holder that is a foreign corporation falls under clause (i), it generally will be taxed on the net gain derived from a sale in the same manner as a U.S. holder and, in addition, may be subject to the branch profits tax on such effectively connected income at a 30% rate (or such lower rate as may be specified by an applicable income tax treaty).

Generally, we must report annually to the Internal Revenue Service and to each non-U.S. holder the amount of dividends paid to such holder and the tax withheld with respect to those payments, if any. Copies of the information returns reporting such payments and any withholding may also be made available to the tax authorities in the country in which the non-U.S. holder resides under the provisions of an applicable income tax treaty. United States backup withholding tax will not apply to such payments if certain certification requirements are satisfied.

United States information reporting requirements and backup withholding tax will not apply to any payment of the proceeds of the sale of common stock effected outside the United States by a foreign office of a “broker” as defined in applicable Treasury regulations (absent actual knowledge or reason to know that the payee is a United States person), unless such broker (1) is a United States person as defined in the Internal Revenue Code, (2) is a foreign person that derives 50% or more of its gross income for certain periods from the conduct of a trade or business in the United States, (3) is a controlled foreign corporation for United States federal income tax purposes or (4) is a foreign partnership with certain U.S. connections. Payment of the proceeds of any such sale effected outside the United States by a foreign office of any broker that is described in the preceding sentence may be subject to backup withholding tax and information reporting requirements, unless such broker has documentary evidence in its records that the beneficial owner is a non-U.S. holder and certain other conditions are met, or the beneficial owner otherwise establishes an exemption. Payment of the proceeds of any such sale to or through the United States office of a broker is subject to information reporting and backup withholding requirements unless the beneficial owner of the common stock satisfies certain certification requirements.

Any investor that may approach or exceed the 5% ownership threshold discussed above, either alone or in conjunction with related persons, should consult its own tax advisor concerning the United States tax consequences that may result. A non-U.S. holder who sells or otherwise disposes of common stock may be required to inform its transferee whether such common stock constitutes a United States real property interest.

The United States federal income tax discussion set forth above is included for general information only and may not be applicable depending upon a holder’s particular situation. Holders should consult their tax advisors with respect to the tax consequences to them of the ownership and disposition of common stock, including the tax consequences under state, local, foreign and other tax laws and the possible effects of changes in United States federal or other tax laws.

This subsection describes certain of the material United States federal income tax consequences of owning and disposing of the preferred stock that Calpine may offer.

The amount of any distribution Calpine makes in respect of its preferred stock will be equal to the amount of cash and the fair market value, on the date of distribution, of any property (including common stock) distributed. Generally, distributions will be treated as a dividend, to the extent of Calpine’s current or accumulated earnings and profits, then as a tax-free return of capital to the extent of a holder’s tax basis in the preferred stock and thereafter as gain from the sale or exchange of such stock as described below.

Dividends received by an individual taxpayer during taxable years before 2009 will be taxed at a maximum rate of 15%, provided the taxpayer satisfies certain holding period and other requirements. Dividends received by an individual taxpayer for taxable years after 2008 will be subject to tax at ordinary income rates.

A dividend distribution to a corporate holder will generally qualify for the dividends-received deduction. In determining entitlement to the dividends-received deduction, corporate holders should also consider the provisions of Sections 246(c), 246A and 1059 of the Internal Revenue Code, as well as Treasury regulations and Internal Revenue Service rulings and administrative pronouncements relating to such provisions. Under current law, Section 246(c) of the Internal Revenue Code disallows the dividends-received deduction in its entirety if the holder does not satisfy the applicable holding period requirement for the dividend-paying stock for a period beginning before and ending after such holder becomes entitled to receive each dividend on the stock. Section 246(c)(4) of the Internal Revenue Code provides that a holder may not count toward this minimum holding period any period in which the holder (1) has an option to sell, is under a contractual obligation to sell, or has made (and not closed) a short sale of, substantially identical stock or securities, or (2) has diminished its risk of loss by holding one or more positions with respect to substantially similar or related property. Under certain circumstances, Section 1059 of the Internal Revenue Code (A) reduces the tax basis of stock by a portion of any “extraordinary dividends” that are eligible for the dividends-received deduction and (B) to the extent that the basis reduction would otherwise reduce the tax basis of the stock below zero, requires immediate recognition of gain, which is treated as gain from the sale or exchange of the stock. An “extraordinary dividend” includes any amount treated as a dividend with respect to a redemption that is not pro rata to all stockholders (or meets certain other requirements), without regard to either the relative amount of the dividend or the holder’s holding period for the stock. Section 246A of the Internal Revenue Code contains the “debt-financed” portfolio stock rules, under which the dividends-received deduction could be reduced to the extent that a holder incurs indebtedness directly attributable to its investment in the stock.

If the preferred stock is convertible into common stock of Calpine, gain or loss will not be recognized by a holder upon the conversion of such preferred stock into common stock if no cash is received. A holder who receives cash in lieu of a fractional share of common stock will in general be treated as having received such fractional share and having exchanged it for cash in a redemption, which would be treated in the manner described under “Sale, Exchange or Redemption of Preferred Stock,” below. As discussed therein, a holder who cannot qualify for sale or exchange treatment under the rules applicable to redemptions will generally be taxable on the cash received in lieu of a fractional share as a distribution described in “— Distributions,” above.

A holder’s tax basis in the common stock received upon conversion will generally be equal to the holder’s tax basis in the preferred stock less the tax basis allocated to any fractional share for which cash is received, and a holder’s holding period in the common stock received upon conversion generally will include the period during which the preferred stock was held by such holder.

If the preferred stock is convertible into common stock of Calpine, adjustments to the conversion price ratio to take into account a stock dividend or stock split generally will not be taxable. However, an adjustment to the conversion price ratio to reflect the issuance of certain rights, warrants, evidences of indebtedness, securities or other assets to holders of common stock (an “Adjustment”) may result in constructive distributions to the holders of the preferred stock. The amount of any such constructive distribution would be the fair market value on the date of the Adjustment of the number of shares of common stock which, if actually distributed to holders of preferred stock, would produce the same increase in the proportionate interests of such holders in the assets or earnings and profits of Calpine as that produced by the Adjustment. The distribution would be treated in the manner described above under “Distributions.”

Under Section 305 of the Internal Revenue Code and the applicable Treasury regulations, if preferred stock with a mandatory redemption date or preferred stock subject to certain redemption rights on the part of either Calpine or the holder of such stock has a redemption price that exceeds its issue price (i.e., its fair market value at its date of original issuance) by more than a de minimis amount, such excess may be treated as a constructive distribution that will be treated in the same manner as distribution described above under “Distributions.” A holder of such preferred stock would be required to treat such excess as a constructive distribution received by the holder over the life of such stock under a constant interest (economic yield) method that takes into account the compounding of yield.

The tax treatment of accrued dividends that are payable upon a redemption of the preferred stock will be addressed in the applicable prospectus supplement.

Upon the sale or exchange of preferred stock, a holder generally will recognize capital gain or loss equal to the difference between (1) the amount of cash and the fair market value of any property received upon the sale or exchange and (2) such holder’s adjusted tax basis in the stock. A holder’s basis in the preferred stock is generally equal to its initial purchase price. In the case of a holder other than a corporation, preferential tax rates may apply to such gain if the holder’s holding period for the preferred stock exceeds one year. Subject to certain limited exceptions, capital losses cannot be applied to offset ordinary income for United States federal income tax purposes.

Gain or loss recognized by a holder on a redemption of the preferred stock will be treated as a sale or exchange and therefore qualify for the treatment described above if certain requirements are satisfied. Generally, these requirements are satisfied if either (1) the holder’s interest in the stock of Calpine is completely terminated as a result of such redemption, (2) such holder’s percentage ownership of Calpine’s voting stock immediately after the redemption is less than 80% of such holder’s percentage ownership immediately before the redemption or (3) the redemption is “not essentially equivalent to a dividend.” The attribution rules of Section 318 of the Internal Revenue Code treat a person as owning stock owned by certain

related parties or certain entities in which the person owns an interest and stock that a person could acquire through exercise of an option. For this purpose, an option would include any conversion right under the preferred stock. Whether a redemption is “not essentially equivalent to a dividend” depends on each holder’s facts and circumstances, but in any event requires a “meaningful reduction” in such holder’s equity interest in Calpine. A holder of the preferred stock who sells some or all of the stock of Calpine owned by it may be able to take such sales into account to satisfy one of the foregoing conditions. Conversely, a holder who purchases additional shares of stock of Calpine may be required to take such shares into account in determining whether any of the foregoing conditions are satisfied.

If none of the above requirements for sale or exchange treatment is satisfied, the entire amount of the cash (or property) received on a redemption will be treated as a distribution (without offset by the holder’s tax basis in the redeemed shares), which will be treated in the same manner as distributions described above under “Distributions.” In such case, the holder’s basis in the redeemed preferred stock would be transferred to the holder’s remaining shares of Calpine stock (if any). If the holder does not retain any shares of Calpine’s stock but dividend treatment arises because of the constructive ownership rules, such basis may be entirely lost to the holder. The Internal Revenue Service has issued proposed regulations that would change the treatment of the basis of redeemed stock when a distribution in redemption of such stock is characterized as a dividend. The regulations are proposed to be effective for transactions occurring after the date on which the proposed regulations are made final and are subject to change prior to their adoption in final form. Holders should consult their tax advisors regarding the potential effects of the regulations.

Special tax rules may apply to certain types of preferred stock. The applicable prospectus supplement will discuss any such special United States federal income tax rules with respect to such preferred stock.

In general, information reporting requirements will apply to payments of dividends on the preferred stock and payments of the proceeds of the sale of the preferred stock, and a backup withholding tax may apply to such payments if the holder fails to comply with certain identification requirements. Back-up withholding is currently imposed at a rate of 28%. Any amounts withheld under the backup withholding rules from a payment to a holder will be allowed as a credit against such holder’s United States federal income tax and may entitle the holder to a refund, provided that the required information is furnished to the Internal Revenue Service.

The rules governing United States federal income taxation of a non-U.S. holder of preferred stock are complex and no attempt will be made herein to provide more than a summary of such rules. Non-U.S. holders should consult with their own tax advisors to determine the effect of federal, state, local and foreign tax laws, as well as treaties, with regard to an investment in the preferred stock, including any reporting requirements.

Distributions by Calpine with respect to the preferred stock that are treated as dividends paid (or deemed paid), as described above under “Distributions” and “Sale, Exchange or Redemption of Preferred Stock,” to a non-U.S. holder (excluding dividends that are effectively connected with the conduct of a United States trade or business by such holder and are taxable as described below) will be subject to United States federal withholding tax at a 30% rate (or a lower rate provided under an applicable income tax treaty). Except to the extent that an applicable income tax treaty otherwise provides, a non-U.S. holder will be taxed in the same manner as a U.S. holder on dividends paid (or deemed paid) that are effectively connected with the conduct of a United States trade or business by the non-U.S. holder. If such non-U.S. holder is a foreign corporation, it may also be subject to a United States branch profits tax on such effectively connected income at a 30% rate (or such lower rate as may be specified by an applicable income tax treaty). Even though such effectively connected dividends are subject to income tax, and may be subject to the branch profits tax, they will not be subject to United States withholding tax if the holder delivers a properly executed Internal Revenue Service Form W-8ECI (or successor form) to the payor or the payor’s agent.

In general, no United States federal income tax or withholding tax will be imposed upon the conversion of preferred stock into common stock by a non-U.S. holder (except with respect to the non-U.S. holder’s receipt of cash in lieu of fractional shares where one of the conditions described below under “Sale, Exchange or Redemption of Preferred Stock” is satisfied).

A non-U.S. holder generally will not be subject to United States federal income tax or withholding tax on the sale or exchange of preferred stock unless (i) the gain is effectively connected with a United States trade or business of the non-U.S. holder, (ii) in the case of a non-U.S. holder who is an individual, such holder is present in the United States for a period or periods aggregating 183 days or more during the taxable year of the disposition, and either (a) such holder has a “tax home” in the United States or (b) the disposition is attributable to an office or other fixed place of business maintained by such holder in the United States or (iii) in the event that Calpine is characterized as a United States real property holding corporation and the non-U.S. holder does not qualify for certain exemptions (see discussion below under “Foreign Investment in Real Property Tax Act”).

Except to the extent that an applicable income tax treaty otherwise provides, (1) if an individual non-U.S. holder falls under clause (i) above, such individual generally will be taxed on the net gain derived from a sale in the same manner as a U.S. holder and (2) if an individual non-U.S. holder falls under clause (ii) above, such individual generally will be subject to a flat 30% tax on the gain derived from a sale, which may be offset by certain United States capital losses (notwithstanding the fact that such individual is not considered a resident of the United States). Individual non-U.S. holders who have spent (or expect to spend) 183 days or more in the United States in the taxable year in which they contemplate a disposition of preferred stock are urged to consult their tax advisors as to the tax consequences of such disposition. If a non-U.S. holder that is a foreign corporation falls under clause (i) above, it generally will be taxed on the net gain derived from a sale in the same manner as a U.S. holder and, in addition, may be subject to the branch profits tax on such effectively connected income at a 30% rate (or such lower rate as may be specified by an applicable income tax treaty).

Gain or loss realized by a non-U.S. holder on a redemption of the preferred stock will be treated as a sale or exchange and qualify for the treatment described in this section if certain requirements are satisfied. For a description of these requirements, see “— U.S. Holders — Sale, Exchange or Redemption of Preferred Stock,” above. If such requirements are not satisfied, then the entire amount of the cash (or property) received on a redemption (without offset by the holder’s tax basis in the redeemed shares) will generally be treated in the same manner as distributions described above under “Distributions” and the holder’s basis in the redeemed preferred stock will be transferred to the holder’s remaining shares of our stock (if any). If the holder does not retain any shares of our stock but dividend treatment arises because of the constructive ownership rules described in “— U.S. Holders — Sale, Exchange or Redemption of Preferred Stock,” such basis may be entirely lost to the holder. The Internal Revenue Service has issued proposed regulations that would change the treatment of the basis of redeemed stock when a distribution in redemption of such stock is characterized as a dividend. The regulations are proposed to be effective for transactions occurring after the date on which the proposed regulations are made final and are subject to change prior to their adoption in final form. Holders should consult their tax advisors regarding the potential effects of the regulations.

United States information reporting requirements and backup withholding tax will not apply to any payment of the proceeds of the sale of preferred stock effected outside the United States by a foreign office of a “broker” as defined in applicable Treasury regulations (absent actual knowledge or reason to know that the payee is a United States person), unless such broker (1) is a United States person as defined in the Internal Revenue Code, (2) is a foreign person that derives 50% or more of its gross income for certain periods from the conduct of a trade or business in the United States, (3) is a controlled foreign corporation for United States federal income tax purposes or (4) is a foreign partnership with certain U.S. connections. Payment of the proceeds of any such sale effected outside the United States by a foreign office of any broker that is described in the preceding sentence may be subject to backup withholding tax and information reporting requirements, unless such broker has documentary evidence in its records that the beneficial owner is a non-U.S. holder and certain other conditions are met, or the beneficial owner otherwise establishes an exemption. Payment of the proceeds of any such sale to or through the United States office of a broker is subject to information reporting and backup withholding requirements unless the beneficial owner of the preferred stock satisfies certain certification requirements.

Under the Foreign Investment in Real Property Tax Act, any person who acquires a “United States real property interest” (as described below) from a foreign person must deduct and withhold a tax equal to 10% of the amount realized by the foreign transferor. In addition, a foreign person who disposes of a United States real property interest generally is required to recognize gain or loss that is subject to United States federal income tax. A “United States real property interest” generally includes any interest (other than an interest solely as a creditor) in a United States corporation unless it is established under specified procedures that the corporation is not (and was not for the prior five-year period) a “United States real property holding corporation.” We believe it is likely that we are a United States real property holding corporation and we can give no assurance that we will not continue to be a United States real property holding corporation in the future. However, so long as the preferred stock is regularly traded on an established securities market, an exemption should apply with respect to any non-U.S. holder whose beneficial and/or constructive ownership of preferred stock is 5% or less of the total fair market value of the preferred stock. In addition, if the preferred stock is not regularly traded on an established securities market, but our common stock continues to be so regularly traded, an exemption should apply if the fair market value of the non-U.S. holder’s interest in the preferred stock is 5% or less of the total fair market value of the common stock.

Any investor that may approach or exceed the 5% ownership threshold discussed above, either alone or in conjunction with related persons, should consult its own tax advisor concerning the United States tax consequences that may result. A non-U.S. holder who sells or otherwise disposes of preferred stock may be required to inform its transferee whether such preferred stock constitutes a United States real property interest.

The United States federal income tax discussion set forth above is included for general information only and may not be applicable depending upon a holder’s particular situation. Holders should consult their tax advisors with respect to the tax consequences to them of the ownership and disposition of the preferred stock, including the tax consequences under state, local, foreign and other tax laws and the possible effects of changes in United States federal or other tax laws.

This subsection describes certain of the material United States federal income tax consequences of owning and disposing of the debt securities offered by Calpine or Energy Finance, as the case may be. It deals only with debt securities that are due to mature 30 years or less from the date on which they are issued. The United States federal income tax consequences of owning and disposing of debt securities that are due to mature more than 30 years from the date of issue will be discussed in an applicable prospectus supplement. The discussion regarding United States federal income tax laws assumes that any debt securities will be issued, and transfers thereof and payments thereon will be made, in accordance with the applicable indenture.

Subject to the original issue discount rules described below, payments of interest on the debt securities (including, in the case of debt securities issued by Energy Finance, the amount of Canadian tax withheld, if any) generally will be taxable to a U.S. holder as ordinary interest income at the time such payments are accrued or received (in accordance with the holder’s regular method of tax accounting).

A debt security will be treated as issued with original issue discount (“OID”) if its stated redemption price at maturity exceeds its issue price by more than a de minimis amount. Generally, the issue price will be the first price at which a substantial amount of the debt securities is sold to persons other than bond houses, brokers or similar persons or organizations acting in the capacity of underwriters, placement agents or wholesalers. A debt security’s stated redemption price at maturity is the total of all payments on the debt security that are not payments of qualified stated interest. An interest payment is qualified stated interest if it is one of a series of stated interest payments that are unconditionally payable at least annually at a single fixed rate.

A debt security is not treated as issued with OID if the OID (i.e., the excess of the stated redemption price at maturity over the issue price) is de minimis. For this purpose the amount of OID is de minimis if it is less than the product of 0.25 percent of the stated redemption price at maturity multiplied by the number of complete years to maturity. If the debt security has de minimis OID, a holder must generally include the de minimis amount in income (as capital gain) as stated principal payments are made.

If the debt security is treated as issued with OID, a U.S. holder will be required to include the amount of the OID in income periodically over the term of the debt security before receipt of the cash or other payment attributable to such income and irrespective of such holder’s general method of tax accounting. In particular, a U.S. holder of a debt security must include in gross income, as interest for United States federal income tax purposes, the sum of the daily portions of OID with respect to the debt security for each day during the taxable year or portion of a taxable year in which such holder holds the debt security (“accrued OID”). The daily portion is determined by allocating to each day of an accrual period a pro rata portion of an amount equal to the adjusted issue price of the debt security at the beginning of the accrual period multiplied by the yield to maturity of the debt security and subtracting from this product the amount of qualified stated interest allocable to the accrual period. The adjusted issue price of the debt security at the start of any accrual period is the issue price of the debt security increased by the accrued OID for each prior accrual period and decreased by the amount of any payments previously made with respect to the debt security (other than qualified stated interest).

If Canadian withholding taxes are imposed on payments on the debt securities issued by Energy Finance, the eligibility of a U.S. holder for a United States foreign tax credit with respect to such taxes may be limited because, for United States foreign tax credit purposes, such payments would constitute income from sources within the United States. Interest on the debt securities will generally constitute “passive income” for United States foreign tax credit purposes. Moreover, if such Canadian withholding taxes are imposed on interest payments at a rate that equals or exceeds 5%, such interest income would constitute “high withholding tax interest” for United States foreign tax credit purposes. A U.S. holder that does not claim a foreign tax credit may be entitled to a deduction for United States federal income tax purposes with respect to any such Canadian withholding taxes. The calculation of foreign tax credits or deductions involves the application of complex rules that depend on a holder’s particular circumstances. Accordingly, U.S. holders are urged to consult their tax advisors regarding the creditability or deductibility of such taxes. For a discussion of the Canadian income tax considerations, see “Certain Canadian Federal Income Tax Considerations,” below.

A holder will be considered to have purchased a debt security at a “market discount” if the holder’s adjusted basis in the debt security immediately after purchase is less than the debt security’s stated redemption price at maturity, or in the case of a debt security issued at a discount, its revised issue price (which has the same meaning as “adjusted issue price” as defined above). A debt security is not treated as having market discount if the amount of market discount is de minimis. For this purpose, the amount of

market discount is de minimis if it is less than the product of 0.25 percent of the stated redemption price at maturity or revised issue price, as the case may be, on the purchase date multiplied by the number of complete years to maturity remaining as of such date. If the debt security has de minims market discount, a holder must generally include such de minimis amount in income (as capital gain) as stated principal payments are made.

If a debt security is treated as having market discount, any gain recognized upon the receipt of any principal payment on, or upon the disposition of, the debt security will generally be treated as ordinary income to the extent that such gain does not exceed the accrued market discount on the debt security that has not been previously included in income. Alternatively, a holder of a debt security may elect to include market discount in income currently over the life of the debt security. Such an election applies to all debt instruments with market discount acquired by the electing holder on or after the first day of the first taxable year to which the election applies and may not be revoked without the consent of the Internal Revenue Service. Market discount accrues on a straight-line basis unless the holder elects to accrue such discount on a constant yield to maturity basis. This latter election is applicable only to the debt security with respect to which it is made and is irrevocable. A holder of a debt security that does not elect to include market discount in income currently generally will be required to defer deductions for interest on borrowings allocable to such debt security in an amount not exceeding the accrued market discount on such debt security until the maturity or disposition of such debt security.

A holder will be considered to have purchased a debt security at a premium if the holder’s adjusted basis in the debt security immediately after the purchase (which does not include any amount paid in respect of accrued interest on the debt security) is greater than the amount payable on maturity. A holder may elect to treat such premium as “amortizable bond premium,” in which case the amount of interest required to be included in the holder’s income each year with respect to the interest on the debt security will be reduced by the amount of the amortizable bond premium allocable (generally under a constant yield method based on the holder’s yield to maturity) to such year with a corresponding decrease in the holder’s tax basis in the debt security. Any election to amortize bond premium is applicable to all debt securities (other than tax-exempt debt securities) held by the holder at the beginning of the first taxable year to which the election applies or thereafter acquired by the holder, and may not be revoked without the consent of the Internal Revenue Service.

A holder will generally recognize capital gain or loss equal to the difference between the amount realized on the sale, exchange or other disposition of the debt security and the holder’s adjusted tax basis in such debt security, except that ordinary income will be recognized to the extent that a portion of the amount realized is attributable to market discount or accrued interest not previously included in income. A holder’s adjusted tax basis in the debt security generally will be the initial purchase price paid therefor, increased by any OID or market discount previously included in income with respect to the debt security and reduced by any amortizable bond premium and any payments previously received with respect to the debt security other than qualified stated interest. In the case of a holder other than a corporation, preferential tax rates may apply to gain recognized on the sale of a debt security if such holder’s holding period for such debt security exceeds one year. Subject to certain limited exceptions, capital losses cannot be applied to offset ordinary income for United States federal income tax purposes.

Special tax rules may apply to certain types of debt securities including, but not limited to, debt securities subject to contingencies, variable rate debt securities and debt securities convertible into equity of Calpine. The applicable prospectus supplement will discuss any such special United States federal income tax rules with respect to such debt securities.

In general, information reporting requirements will apply to payments of principal, premium, if any, and interest on the debt securities and payments of the proceeds of the sale of the debt securities, and a backup withholding tax may apply to such payments if the holder fails to comply with certain identification

requirements. Back-up withholding is currently imposed at a rate of 28%. Any amounts withheld under the backup withholding rules from a payment to a holder will be allowed as a credit against such holder’s United States federal income tax and may entitle the holder to a refund, provided that the required information is furnished to the Internal Revenue Service.

The rules governing United States federal income taxation of a non-U.S. holder of debt securities are complex and no attempt will be made herein to provide more than a summary of such rules. Non-U.S. holders should consult with their own tax advisors to determine the effect of federal, state, local and foreign tax laws, as well as treaties, with regard to an investment in the debt securities, including any reporting requirements.

This discussion assumes that the debt security or coupon is not subject to the rules of Section 871(h)(4)(A) of the Internal Revenue Code, relating to interest payments that are determined by reference to income, profits, changes in value of property or other attributes of the issuer or a related party.

Generally, interest income of a non-U.S. holder that is not effectively connected with a United States trade or business will be subject to a withholding tax at a 30% rate (or, if applicable, a lower tax rate specified by a treaty). However, interest income earned on a debt security by a non-U.S. holder will qualify for the “portfolio interest” exemption and therefore will not be subject to United States federal income tax or withholding tax, provided that such interest income is not effectively connected with a United States trade or business of the non-U.S. holder and provided that (1) the non-U.S. holder does not actually or constructively own 10% of more of the total combined voting power of all classes of the issuer’s stock entitled to vote; (2) the non-U.S. holder is not a controlled foreign corporation that is related to the issuer or Calpine through stock ownership; (3) the non-U.S. holder is not a bank which acquired the debt security in consideration for an extension of credit made pursuant to a loan agreement entered into in the ordinary course of business; and (4) either (A) the non-U.S. holder certifies to the payor or the payor’s agent, under penalties of perjury, that it is not a United States person and provides its name, address, and certain other information on a properly executed Internal Revenue Service Form W-8BEN or a suitable substitute form or (B) a securities clearing organization, bank or other financial institution that holds customer securities in the ordinary course of its trade or business and holds the debt securities in such capacity, certifies to the payor or the payor’s agent, under penalties of perjury, that such a statement has been received from the beneficial owner by it or by a financial institution between it and the beneficial owner, and furnishes the payor or the payor’s agent with a copy thereof. The applicable United States Treasury regulations also provide alternative methods for satisfying the certification requirements of clause (4), above. If a non-U.S. holder holds the debt security through certain foreign intermediaries or partnerships, such holder and the foreign intermediary or partnership may be required to satisfy certification requirements under applicable United States Treasury regulations.

Except to the extent that an applicable income tax treaty otherwise provides, a non-U.S. holder generally will be taxed with respect to interest in the same manner as a U.S. holder if the interest is effectively connected with a United States trade or business of the non-U.S. holder. Effectively connected interest income received or accrued by a corporate non-U.S. holder may also, under certain circumstances, be subject to an additional “branch profits” tax at a 30% rate (or, if applicable, at a lower tax rate specified by an applicable income tax treaty). Even though such effectively connected income is subject to income tax, and may be subject to the branch profits tax, it is not subject to withholding tax if the non-U.S. holder delivers a properly executed Internal Revenue Service Form W-8ECI (or successor form) to the payor or the payor’s agent.

A non-U.S. holder generally will not be subject to United States federal income tax or withholding tax on any gain realized on the sale, exchange or other disposition of a debt security unless (i) the gain is effectively connected with a United States trade or business of the non-U.S. holder or (ii) in the case of a non-U.S. holder who is an individual, such holder is present in the United States for a period or periods aggregating 183 days or more during the taxable year of the disposition, and either (a) such holder has a “tax home” in the United States or (b) the disposition is attributable to an office or other fixed place of business maintained by such holder in the United States.

Except to the extent that an applicable income tax treaty otherwise provides, (1) if an individual non-U.S. holder falls under clause (i) above, such individual generally will be taxed on the net gain derived from a sale in the same manner as a U.S. holder and (2) if an individual non-U.S. holder falls under clause (ii) above, such individual generally will be subject to a flat 30% tax on the gain derived from a sale, which may be offset by certain United States capital losses (notwithstanding the fact that such individual is not considered a resident of the United States). Individual non-U.S. holders who have spent (or expect to spend) 183 days or more in the United States in the taxable year in which they contemplate a sale or other disposition of a debt security are urged to consult their tax advisors as to the tax consequences of such sale. If a non-U.S. holder that is a foreign corporation falls under clause (i), it generally will be taxed on the net gain derived from a sale in the same manner as a U.S. holder and, in addition, may be subject to the branch profits tax on such effectively connected income at a 30% rate (or such lower rate as may be specified by an applicable income tax treaty).

Generally, we must report annually to the Internal Revenue Service and to each non-U.S. holder the amount of interest paid to such holder and the tax withheld with respect to those payments, if any. Copies of the information returns reporting such payments and any withholding may also be made available to the tax authorities in the country in which the non-U.S. holder resides under the provisions of an applicable income tax treaty. United States backup withholding tax will not apply to such payments if the statement described in clause (4) under “Interest Income” above is duly provided by such holder, provided that the payor does not have actual knowledge or reason to know that the holder is a United States person.

Information reporting requirements and backup withholding tax will not apply to any payment of the proceeds of the sale of debt securities effected outside the United States by a foreign office of a “broker” as defined in applicable Treasury regulations (absent actual knowledge that the payee is a United States person), unless such broker (1) is a United States person as defined in the Internal Revenue Code, (2) is a foreign person that derives 50% or more of its gross income for certain periods from the conduct of a trade or business in the United States, (3) is a controlled foreign corporation for United States federal income tax purposes or (4) is a foreign partnership with certain U.S. connections. Payment of the proceeds of any such sale effected outside the United States by a foreign office of any broker that is described in the preceding sentence may be subject to backup withholding tax and information reporting requirements unless such broker has documentary evidence in its records that the beneficial owner is a non-U.S. holder and certain other conditions are met, or the beneficial owner otherwise establishes an exemption. Payment of the proceeds of any such sale to or through the United States office of a broker is subject to information reporting and backup withholding requirements unless the beneficial owner of the debt securities provides the statement described in clause (4) of “Interest Income” or otherwise establishes an exemption.

The United States federal income tax discussion set forth above is included for general information only and may not be applicable depending upon a holder’s particular situation. Holders should consult their tax advisors with respect to the tax consequences to them of the ownership and disposition of the debt securities, including the tax consequences under state, local, foreign and other tax laws and the possible effects of changes in United States federal or other tax laws.

This subsection describes certain of the material United States federal income tax consequences of owning and disposing of the debt securities offered by Energy Finance II. It deals only with debt securities that are due to mature 30 years or less from the date on which they are issued. The United States federal income tax consequences of owning and disposing of debt securities that are due to mature more than 30 years from the date of issue will be discussed in an applicable prospectus supplement. The discussion regarding United States federal income tax laws, including the statements regarding the U.S.-Canada double taxation convention relating to income and capital gains (the “Tax Treaty”), assumes that any debt securities will be issued, and transfers thereof and payments thereon will be made, in accordance with the applicable indenture.

Subject to the original issue discount rules described below, payments of interest on the debt securities (including the amount of Canadian tax withheld, if any) generally will be taxable to a U.S. holder as ordinary interest income at the time such payments are accrued or received (in accordance with the holder’s regular method of tax accounting).

A debt security is not treated as issued with OID if the OID (i.e., the excess of the stated redemption price at maturity over the issue price) is de minimis. For this purpose the amount of OID is de minimis if it is less than the product of 0.25 percent of the stated redemption price at maturity multiplied by the number of complete years to maturity. If the debt security has de minimis OID, a holder must generally include the de minimis amount in income (as capital gain) as stated principal payments are made.

If Canadian withholding taxes are imposed on payments on the debt securities issued by Energy Finance II, a U.S. holder may be eligible for a United States foreign tax credit with respect to such taxes. The interest payments will be foreign source income and will generally constitute “passive income” for foreign tax credit purposes. Moreover, if Canadian withholding taxes are imposed on the interest payments at a rate that equals or exceeds 5%, such interest income would constitute “high withholding tax interest” for United States foreign tax credit purposes. A U.S. holder who is entitled under the Tax Treaty to a refund of Canadian tax, if any, withheld on interest on the debt securities will not be entitled to claim a foreign tax credit with respect to such withheld tax. A U.S. holder that does not claim a foreign tax credit may be entitled to a deduction for United States federal income tax purposes with respect to any such Canadian withholding taxes. The calculation of foreign tax credits or deductions involves the application of complex rules that depend on a holder’s particular circumstances. Accordingly, U.S. holders are urged to consult their tax advisors regarding the creditability or deductibility of such taxes. For a discussion of the Canadian income tax considerations, see “Certain Canadian Federal Income Tax Considerations,” below.

having market discount if the amount of market discount is de minimis. For this purpose, the amount of market discount is de minimis if it is less than the product of 0.25 percent of the stated redemption price at maturity or revised issue price, as the case may be, on the purchase date multiplied by the number of complete years to maturity remaining as of such date. If the debt security has de minims market discount, a holder must generally include such de minimis amount in income (as capital gain) as stated principal payments are made.

A holder will be considered to have purchased the debt security at a premium if the holder’s adjusted basis in the debt security immediately after the purchase (which does not include any amount paid in respect of accrued interest on the debt security) is greater than the amount payable on maturity. A holder may elect to treat such premium as “amortizable bond premium,” in which case the amount of interest required to be included in the holder’s income each year with respect to the interest on the debt security will be reduced by the amount of the amortizable bond premium allocable (generally under a constant yield method based on the holder’s yield to maturity) to such year with a corresponding decrease in the holder’s tax basis in the debt security. Any election to amortize bond premium is applicable to all debt securities (other than tax-exempt debt securities) held by the holder at the beginning of the first taxable year to which the election applies or thereafter acquired by the holder, and may not be revoked without the consent of the Internal Revenue Service.

In general, information reporting requirements and backup withholding will not apply to payments of principal, premium, if any, and interest on the debt securities and payments of the proceeds of the sale of the

debt securities if all actions necessary to effect such payments are completed outside the United States. If any such actions are effected within the United States or if payments are made by transfer to an account maintained by the payee in the United States or by mail to a United States address, information reporting and a backup withholding tax may apply to such payments if the holder fails to comply with certain identification requirements. Backup withholding is currently imposed at a rate of 28%. Any amounts withheld under the backup withholding rules from a payment to a holder will be allowed as a credit against such holder’s United States federal income tax and may entitle the holder to a refund, provided that the required information is furnished to the Internal Revenue Service.

The United States federal income tax discussion set forth above is included for general information only and may not be applicable depending upon a holder’s particular situation. Holders should consult their tax advisors with respect to the tax consequences to them of the ownership and disposition of the debt securities, including the tax consequences under state, local, foreign and other tax laws and the possible effects of changes in United States federal or other tax laws.

The discussion below is intended to be a general description only of certain Canadian federal income tax considerations applicable to the ownership and disposition of debt securities of Energy Finance or Energy Finance II acquired pursuant to this offering, and is not intended to be, nor should it be construed to be, legal or tax advice to any particular Purchaser (as defined below). Accordingly, prospective Purchasers (as defined below) are urged to consult their own tax advisors with respect to the Canadian federal and provincial tax consequences of an investment in the debt securities.

In the opinion of McCarthy Tétrault LLP, Canadian tax counsel to Energy Finance and Energy Finance II, the following is a summary of the principal Canadian federal income tax considerations generally applicable under the Income Tax Act (Canada) (the “Tax Act”) to a person (a “Purchaser”) who acquires beneficial ownership of debt securities of Energy Finance or Energy Finance II pursuant to this offering and who for purposes of the Tax Act, and at all relevant times, is not resident or deemed to be resident in Canada, deals at arm’s length with the issuer of the debt securities, and does not use or hold, and is not deemed to use or hold, the debt securities in carrying on business in Canada. For purposes of the Tax Act, related persons (as defined therein) are deemed not to deal at arm’s length, and it is a question of fact whether persons not related to each other deal at arm’s length.

This summary is based on the current provisions of the Tax Act and the Regulations thereunder (the “Regulations”) in force on the date hereof, specific proposals (the “Tax Proposals”) to amend the Tax Act or the Regulations publicly announced by the Minister of Finance prior to the date hereof, and counsel’s understanding of the current published administrative and assessing practices of the Canada Customs and Revenue Agency (the “CRA”). This summary is not exhaustive of all possible Canadian income tax consequences and, except for the Tax Proposals, does not take into account or anticipate any changes in law or changes in the administrative and assessing practices of the CRA, whether by legislative, governmental or judicial action, nor does it take into account income tax laws or considerations of any province or territory of Canada or any jurisdiction other than Canada. No assurance can be given that the Tax Proposals will become law in their present form or at all.

The summary assumes that no interest payable on the debt securities will be contingent or dependent on the use of or production from property in Canada or computed by reference to revenue, profit, cash flow, commodity price or any other similar criteria or by reference to dividends paid or payable to stockholders of any class of shares of the capital stock of a corporation.

The payment of interest, premium, if any, and principal by Energy Finance or Energy Finance II on the debt securities of a particular series to such a Purchaser will be exempt from Canadian non-resident withholding tax under the Tax Act, provided that the terms of the debt securities of that particular series do not require the issuer thereof to repay more than 25% of the principal amount payable thereunder before the fifth anniversary of the date of issue of that particular series of debt securities. If the terms of the debt securities of a particular series do require the issuer to repay more than 25% of the principal amount thereof before the fifth anniversary of the date of issue thereof, or if a Purchaser thereof does not deal at arm’s length with the issuer, the payment of interest thereon will be subject to Canadian non-resident withholding tax under the Tax Act at a rate of 25% thereof (or, if applicable, such lower rate as is specified by a tax treaty between Canada and the Purchaser’s country of residence).

No other tax on income (including capital gains) will be payable under the Tax Act in respect of the holding, repayment, redemption or disposition of the debt securities, or the receipt of interest, premium, if any, or principal thereon by a Purchaser, except that in certain circumstances a non-resident insurer carrying on business in Canada and elsewhere in respect of which the debt securities are designated insurance property for purposes of the Tax Act, may be subject to such taxes.

The validity of the securities offered hereby by Calpine, including the guarantees of Calpine issued in connection with the issuance of debt securities by Energy Finance and Energy Finance II and in connection with the issuance of the trust preferred securities by Trust IV and Trust V, will be passed upon for us by Covington & Burling, New York, New York. The validity of the debt securities and warrants of Energy Finance and Energy Finance II offered hereby will be passed upon for us by Covington & Burling, New York, New York and by Stewart McKelvey Stirling Scales, Halifax, Nova Scotia, Canada. The validity of the trust preferred securities to be issued by Trust IV and Trust V, the enforceability of the declarations of trust and the creation of Trust IV and Trust V will be passed upon for us by Richards, Layton and Finger, P.A., Wilmington, Delaware. Any underwriters will be represented by Latham & Watkins LLP, New York, New York.

The consolidated financial statements of Calpine Corporation as of and for the year ended December 31, 2003, incorporated in this prospectus by reference to Calpine Corporation’s Annual Report on Form 10-K/A for the year ended December 31, 2003, have been so incorporated in reliance on the report of PricewaterhouseCoopers LLP, an independent registered public accounting firm, given on the authority of said firm as experts in auditing and accounting.

The 2002 and 2001 consolidated financial statements and related financial statement schedules of Calpine Corporation incorporated by reference from Calpine Corporation’s Annual Report on Form 10-K/A Amendment No. 2 for the year ended December 31, 2003 have been audited by Deloitte & Touche LLP, an independent registered public accounting firm, as stated in their report, which is incorporated herein by reference (which report expresses an unqualified opinion and includes emphasis relating to the adoption of new accounting standards in 2002 and 2001 and divestitures), and have been so incorporated in reliance upon the report of such firm given upon their authority as experts in accounting and auditing.


	Page

ABOUT THIS PROSPECTUS SUPPLEMENT		S-1
FORWARD-LOOKING STATEMENTS		S-1
SUMMARY		S-3
RISK FACTORS		S-21
USE OF PROCEEDS		S-37
CAPITALIZATION		S-38
PRICE RANGE OF COMMON STOCK		S-40
CONCURRENT OFFERING OF CONVERTIBLE NOTES		S-41
DESCRIPTION OF CAPITAL STOCK		S-43
UNDERWRITING		S-47
LEGAL MATTERS		S-49
INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM		S-49
WHERE YOU CAN FIND MORE INFORMATION ABOUT US AND THIS OFFERING		S-49


	Page

ABOUT THIS PROSPECTUS		1
CALPINE CORPORATION		3
CALPINE CANADA ENERGY FINANCE ULC AND CALPINE CANADA ENERGY FINANCE II ULC		6
CALPINE CAPITAL TRUST IV AND CALPINE CAPITAL TRUST V		7
RISK FACTORS		8
WHERE YOU CAN FIND MORE INFORMATION; DOCUMENTS INCORPORATED BY REFERENCE		8
FORWARD-LOOKING STATEMENTS		10
CALPINE CONSOLIDATED RATIO OF EARNINGS TO FIXED CHARGES		11
USE OF PROCEEDS		11
PLAN OF DISTRIBUTION		12
DESCRIPTION OF CAPITAL STOCK		14
DESCRIPTION OF DEPOSITARY SHARES		17
DESCRIPTION OF THE DEBT SECURITIES		20
DESCRIPTION OF PURCHASE CONTRACTS		35
DESCRIPTION OF UNITS		36
DESCRIPTION OF WARRANTS		37
DESCRIPTION OF TRUST PREFERRED SECURITIES		38
CERTAIN UNITED STATES FEDERAL INCOME TAX CONSEQUENCES		43
CERTAIN CANADIAN FEDERAL INCOME TAX CONSIDERATIONS		58
LEGAL MATTERS		59
EXPERTS		59


Common stock offered by us		89,000,000 shares
Common stock to be outstanding after the offering		534,020,678 shares (including the 89 million shares offered hereby)
New York Stock Exchange Symbol		CPN



											(Unaudited)

											Six Months Ended
		Year Ended December 31,									June 30,

		2001			2002			2003			2003			2004


		(Dollars in thousands)
Summary Income Statement:
Revenue
	Electric generation and marketing revenue	$	5,717,736		$	6,368,193		$	7,409,931		$	3,572,417		$	3,435,358
	Oil and gas production and marketing revenue		812,758			991,396			1,428,564			711,155			885,359
	Trading revenue, net		151,738			21,485			(26,439	)		22,282			(10,086	)
	Other revenue		32,697			10,787			107,483			25,386			46,741

	Total revenue		6,714,929			7,391,861			8,919,539			4,331,240			4,357,372
Cost of Revenue
	Electric generation and marketing expense		3,338,100			3,142,031			3,394,032			1,772,216			1,263,517
	Oil and gas production and marketing expense		583,079			918,564			1,385,812			702,764			860,179
	Fuel expense		1,150,786			1,752,901			2,564,742			1,174,778			1,630,490
	Depreciation, depletion and amortization		309,373			453,411			583,912			272,771			311,203
	Operating lease expense		99,519			111,022			112,070			55,860			54,762
	Other expense		10,943			7,279			42,270			12,121			48,988

	Total cost of revenue		5,491,800			6,385,208			8,082,838			3,990,510			4,169,139
Gross Profit			1,223,129			1,006,653			836,701			340,730			188,233
	General and administrative expense		150,453			229,011			265,653			97,367			118,225
	Equipment cancellation and asset impairment charge		—			404,737			64,384			19,309			2,367
	Other (income) expense		60,560			50,429			(38,544	)		(48,457	)		18,899

Income from Operations			1,012,116			322,476			545,208			272,511			48,742
	Interest expense		196,621			413,690			726,103			291,840			534,452
	Distributions on trust preferred securities(1)		62,412			62,632			46,610			31,313			—
	Interest (income) Income		(72,448	)		(43,087	)		(39,716	)		(17,037	)		(21,981	)
	Other (income) expense (income)		(55,049	)		(149,504	)		(297,408	)		55,905			(194,231	)

Income (Loss) before Provision (Benefit) for Income Taxes			880,580			38,745			109,619			(89,510	)		(269,498	)



										(Unaudited)

										Six Months Ended
		Year Ended December 31,								June 30,

		2001		2002			2003			2003			2004


		(Dollars in thousands)
	Provision (Benefit) for income taxes		297,614		(14,945	)		(134	)		(21,596	)		(146,553	)
Income (Loss) before Discontinued Operations and Cumulative Effect of a Change in Accounting Principle			582,966		53,690			109,753			(67,914	)		(122,945	)
	Discontinued operations, net		39,490		64,928			(8,674	)		(7,997	)		23,055
	Cumulative effect of a change in accounting principle, net		1,036		—			180,943			529			—

Net Income (Loss)		$	623,492	$	118,618		$	282,022		$	(75,382	)	$	(99,890	)



	(Unaudited)

	As of June 30, 2004

	Actual		As Adjusted (1)


	(Dollars in thousands)
Balance Sheet Data:
Cash and cash equivalents	$	844,031	$	1,737,300	(2)
Property, plant and equipment, net		21,031,174		20,447,791

Total assets		27,441,762		27,762,100
Notes payable and borrowings under lines of credit		1,100,713		1,100,713
Preferred interests		150,822		150,822

Capital lease obligation		291,471		291,471
Construction/project financing		5,017,072		5,017,072

Notes offered hereby		—		503,400
First priority senior secured notes due 2014		—		785,000
Senior secured credit facility		298,500		—
Second priority senior secured notes and term loans		3,683,280		3,683,280
Non-convertible senior unsecured notes		5,403,656		5,362,916
Convertible senior notes		972,126		705,901
Notes payable to Calpine Capital Trusts (3)		1,153,500		517,500
Total debt		18,071,140		18,118,075

Minority interests		350,561		350,561
Total stockholders’ equity	$	4,600,891	$	4,684,479



		Year Ended						Six Months Ended
		December 31, 2003						June 30, 2004

		Actual			Pro Forma			Actual			Pro Forma


		(Dollars in thousands)
Summary Income Statement:

Revenue
	Electric generation and marketing revenue	$	7,409,931		$	7,394,584		$	3,435,358		$	3,435,358
	Oil and gas production and marketing revenue		1,428,564			1,380,058			885,359			864,493
	Trading revenue, net		(26,439	)		(26,439	)		(10,086	)		(10,086	)
	Other revenue		107,483			122,830			46,741			46,741

	Total revenue		8,919,539			8,871,033			4,357,372			4,336,506
Cost of Revenue
	Electric generation and marketing expense		3,394,032			3,424,501			1,263,517			1,263,517
	Oil and gas production and marketing expense		1,385,812			1,355,021			860,179			842,555
	Fuel expense		2,564,742			2,665,618			1,630,490			1,685,920
	Depreciation, depletion and amortization		583,912			507,315			311,203			271,762
	Operating lease expense		112,070			112,070			54,762			54,762
	Other expense		42,270			42,270			48,988			48,988

	Total cost of revenue		8,082,838			8,106,795			4,169,139			4,167,504


		Number				With
		of Plants		Baseload		Peaking


				Net Interest (MW)
In operation
	Gas-fired		72		20,446		25,456
	Geothermal		19		750		750
Under construction
	Gas-fired (new facilities)		12		5,107		5,751
	Gas-fired expansion projects (two)		—		—		—

Total			103		26,303		31,957


					% of Calpine
			MW		Portfolio

North America
	WECC (Western Electricity Coordinating Council)			8,289		26	%
	ERCOT (Electric Reliability Council of Texas)			7,617		24	%
	SERC (Southeastern Electric Reliability Council)			6,341		20	%
	MAIN (Mid-America Interconnected Network)			2,302		7	%
	SPP (Southwest Power Pool)			1,703		5	%
	NPCC-NE (Northeast Power Coordinating Council, New England)			1,239		4	%
	FRCC (Florida Reliability Coordinating Council)			770		2	%
	MAAC (Mid-Atlantic Area Council)			853		3	%
	ECAR (East Central Area Reliability Coordination)			700		2	%
	NPCC-NY (Northeast Power Coordinating Council, New York)			334		1	%
	NPCC-Ontario (Northeast Power Coordinating Council, Ontario)			8		—
	Mexico			236		1	%
	MAPP (Mid-Continent Area Power Pool)			365		1	%
		Subtotal		30,757		96	%
United Kingdom				1,200		4	%
Total				31,957		100	%


	As of			As
	December 31, 2003			Adjusted(2)


	(Mmcfe)
California		194,109			194,109
Rockies		103,618	(3)		390	(4)
South Texas		212,331			212,331
Gulf Coast Onshore		39,884			39,884
Gulf Coast Offshore		25,150			25,150
Alberta		264,283	(5)		—

Total		839,376	(5)		471,865


	*We depend on our electricity and thermal energy customers.*


	*The unresolved issues arising from the California power market, where 39 of our 91 operating power plants are located, could adversely affect our performance.*


	*Our results are subject to quarterly and seasonal fluctuations.*


	The ultimate outcome of the legal proceedings relating to our activities cannot be predicted. Any adverse determination could have a material adverse effect on our financial condition and results of operations.



		Common Stock
		Price ($)

		High		Low

Year ended December 31, 2002
	First Quarter		17.28		6.15
	Second Quarter		13.55		5.30
	Third Quarter		7.29		2.36
	Fourth Quarter		4.69		1.55
Year ended December 31, 2003
	First Quarter		4.42		2.51
	Second Quarter		7.25		3.33
	Third Quarter		8.03		4.76
	Fourth Quarter		5.25		3.28
Year ended December 31, 2004
	First Quarter		6.42		4.35
	Second Quarter		4.98		3.04
	Third Quarter (through September 20, 2004)		4.46		3.22


	Per Share		Total

Underwriting Discounts and Commissions paid by us	$	0	$	0
Expenses payable by us	$	.006	$	500,000


	Receipt of Common Stock Upon Conversion of the Preferred Stock


	Adjustments of Conversion Price in Respect of Preferred Stock


	Source of Income and Foreign Tax Credits With Respect to Debt Securities of Energy Finance