Filed by Kinder Morgan Energy Partners, L.P.

pursuant to Rule 425 under the Securities Act of

1933 and deemed filed pursuant to Rule 14a-12 of

the Securities Exchange Act of 1934.

Subject Company: Copano Energy, L.L.C.

Commission File No.: 001-32329

We are delighted to announce that Kinder Morgan Energy Partners has entered into an agreement to acquire Copano Energy. We believe this transaction is a win-win opportunity for Kinder Morgan and Copano and the employees and the unitholders of both companies. We remain bullish on the future of domestic shale plays, which are revolutionizing the energy landscape across the United States, and believe they will drive substantial future growth at Kinder Morgan. Combining Copano’s gathering, processing and fractionation assets with KMP’s financial strength and our extensive pipeline transportation and storage assets, should provide an excellent platform to further grow Copano’s midstream services footprint. Furthermore, Copano has identified a large number of attractive expansion projects and KMP has the capital to fund them.

The combination of KMP and Copano is expected to produce immediate value (upon closing) to KMP unitholders and KMI shareholders through strong cash flow accretion. Broadening our midstream services footprint at KMP with Copano’s complementary assets will also allow us to offer a wider array of services to existing and potential customers.

If all goes as expected, KMP and Copano will be one company soon. Until then, it’s important for all of us to do everything we can to stay focused on performing our jobs to the best of our abilities to positively position each company for the future. At Kinder Morgan, we should remain focused on striving for financial and operational excellence, and meeting our customers’ needs. For most of you, this transaction won’t change your daily responsibilities.

We want to thank you for making this transaction possible. We were able to make this acquisition because of your ongoing hard work and the successes that we have experienced together through the years in growing our company.

Rich Kinder

Park Shaper

Steve Kean

IMPORTANT ADDITIONAL INFORMATION WILL BE FILED WITH THE SEC

KMP plans to file with the SEC a Registration Statement on Form S-4 in connection with the transaction. KMP and Copano plan to file with the SEC and Copano plans to mail to its unitholders a Proxy Statement/Prospectus in connection with the transaction. The Registration Statement and the Proxy Statement/Prospectus will contain important information about KMP, Copano, the transaction and related matters. INVESTORS AND SECURITY HOLDERS ARE URGED TO READ THE REGISTRATION STATEMENT AND THE PROXY STATEMENT/PROSPECTUS CAREFULLY WHEN THEY ARE AVAILABLE.

Investors and security holders will be able to obtain free copies of the Registration Statement and the Proxy Statement/Prospectus and other documents filed with the SEC by KMP and Copano through the web site maintained by the SEC at www.sec.gov or by phone, email or written request by contacting the investor relations department of KMP or Copano at the following:

	KMP	Copano
Address:	1001 Louisiana Street, Suite 1000	1200 Smith Street, Suite 2300
	Houston, Texas 77002	Houston, Texas 77002
	Attention: Investor Relations	Attention: Investor Relations
Phone:	(713) 369-9490	(713) 621-9547
E-mail:	kmp_ir@kindermorgan.com	ir@copano.com

PARTICIPANTS IN THE SOLICITATION

KMP and Copano, and their respective directors and executive officers, may be deemed to be participants in the solicitation of proxies in respect of the transactions contemplated by the merger agreement. Information regarding the directors and executive officers of KMP’s general partner and Kinder Morgan Management, LLC, the delegate of KMP’s general partner, is contained in KMP’s Form 10-K for the year ended December 31, 2011, which has been filed with the SEC. Information regarding Copano’s directors and executive officers is contained in Copano’s Form 10-K for the year ended December 31, 2011 and its proxy statement filed on April 5, 2012, which are filed with the SEC. A more complete description will be available in the Registration Statement and the Proxy Statement/Prospectus.

SAFE HARBOR FOR FORWARD-LOOKING STATEMENTS

Statements in this document regarding the proposed transaction between KMP and Copano, the expected timetable for completing the proposed transaction, future financial and operating results, benefits and synergies of the proposed transaction, future opportunities for the combined company and any other statements about KMP or Copano management’s future expectations, beliefs, goals, plans or prospects constitute forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. Any statements that are not statements of historical fact (including statements containing the words “believes,” “plans,” “anticipates,” “expects,” “estimates” and similar expressions) should also be considered to be forward-looking statements. There are a number of important factors that could cause actual results or events to differ materially from those indicated by such forward-looking statements, including: the ability to consummate the proposed transaction; the ability to obtain requisite regulatory and unitholder approval and the satisfaction of the other conditions to the consummation of the proposed transaction; the ability of KMP to successfully integrate Copano’s operations and employees and realize anticipated synergies and cost savings; the potential impact of the announcement or consummation of the proposed transaction on relationships, including with employees, suppliers, customers and competitors; the ability to achieve revenue growth; price volatility and market demand for natural gas and natural gas liquids; higher construction costs or project delays due to inflation, limited availability of required resources or the effects of environmental, legal or other uncertainties; the ability of the combined company to continue to obtain new sources of natural gas supply; the impact on volumes and resulting cash flow of technological, economic and other uncertainties inherent in estimating future production, producers’ ability to drill and successfully complete and attract new natural gas supplies and the availability of downstream transportation systems and other facilities for natural gas and NGLs; the effects of government regulations and policies and of the pace of deregulation of retail natural gas; national, international, regional and local economic or competitive conditions and developments; capital and credit markets conditions; interest rates; the political and economic stability of oil producing nations; energy markets, including changes in the price of certain commodities; weather, alternative energy sources, conservation and technological advances that may affect price trends and demand; business and regulatory or legal decisions; the timing and success of business development efforts; acts of nature, accidents, sabotage, terrorism or other similar acts causing damage greater than the insurance coverage limits of the combined company; and the other factors and financial, operational and legal risks or uncertainties described in KMP’s and Copano’s Annual Reports on Form 10-K for the year ended December 31, 2011 and their most recent quarterly report filed with the SEC. KMP and Copano disclaim

any intention or obligation to update any forward-looking statements as a result of developments occurring after the date of this document.