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Regulation
12 Months Ended
Dec. 31, 2012
Public Utilities, General Disclosures [Abstract]  
Regulation
Regulation

General
The rates and services of the Company are regulated by incorporated municipalities in Texas, the PUCT, the NMPRC, and the FERC. The PUCT and the NMPRC have jurisdiction to review municipal orders, ordinances and utility agreements regarding rates and services within their respective states and over certain other activities of the Company. The FERC has jurisdiction over the Company's wholesale (sales for resale) transactions, transmission service and compliance with federally-mandated reliability standards. The decisions of the PUCT, NMPRC and the FERC are subject to judicial review.
Texas Regulatory Matters
2012 Texas Retail Rate Case. The Company filed a rate increase request with the PUCT, Docket No. 40094, the City of El Paso, and other Texas cities on February 1, 2012. The rate filing was made in response to a resolution adopted by the El Paso City Council (the "Council") requiring the Company to show cause why its base rates for customers in the El Paso city limits should not be reduced. The filing at the PUCT also included a request to reconcile $356.5 million of fuel expense for the period July 1, 2009 through September 30, 2011.

On April 17, 2012, the Council approved the settlement of the Company's 2012 Texas retail rate case and fuel reconciliation in PUCT Docket No. 40094. The PUCT issued a final order approving the settlement on May 23, 2012.
Under the terms of the settlement, among other things, the Company agreed to:
A reduction in its non-fuel base rates of $15 million annually, with the decrease being allocated primarily to Texas retail commercial and industrial customer classes. The rate decrease was effective as of May 1, 2012;
Revised depreciation rates for the Company's gas-fired generating units and for transmission and distribution plant that lower depreciation expense by $4.1 million annually;
Continuation of the 10.125% return on equity for the purpose of calculating the allowance for funds used during construction; and
A
two-year amortization of rate case expenses, none of which will be included in future regulatory proceedings.
As part of the settlement, the Company agreed to withdraw its request to reconcile fuel costs for the period from July 1, 2009 through September 30, 2011. The Company will file a fuel reconciliation request covering the period beginning July 1, 2009 and ending no later than June 30, 2013 by December 31, 2013 or as part of its next rate case, if earlier.
Fuel and Purchased Power Costs. The Company's actual fuel costs, including purchased power energy costs, are recoverable from its customers. The PUCT has adopted a fuel cost recovery rule ("Texas Fuel Rule") that allows the Company to seek periodic adjustments to its fixed fuel factor. In 2010, the Company received approval to implement a formula to determine its fuel factor which adjusts natural gas and purchased power to reflect natural gas futures prices. The Company can seek to revise its fixed fuel factor based upon the approved formula at least four months after its last revision except in the month of December. The Texas Fuel Rule requires the Company to request to refund fuel costs in any month when the over-recovery balance exceeds a threshold material amount and it expects fuel costs to continue to be materially over-recovered. The Texas Fuel Rule also permits the Company to seek to surcharge fuel under-recoveries in any month the balance exceeds a threshold material amount and it expects fuel cost recovery to continue to be materially under-recovered. Fuel over and under-recoveries are considered material when they exceed 4% of the previous twelve months' fuel costs. All such fuel revenue and expense activities are subject to periodic final review by the PUCT in fuel reconciliation proceedings.
During 2012, the Company filed the following petition with the PUCT to refund recent fuel cost over-recoveries, due primarily to fluctuations in natural gas markets and consumption levels. The table summarizes the docket number assigned by the PUCT, the date the Company filed the petition and the date a final order was issued by the PUCT approving the refund to customers. The fuel cost over-recovery period represents the months in which the over-recoveries took place, and the refund period represents the billing month in which customers received the refund amounts shown, including interest: 
Docket
No.
 
Date Filed
 
Date Approved
 
Recovery Period
 
Refund Period
 
Refund
Amount Authorized (In Thousands)
40622
 
August 3, 2012
 
September 28, 2012
 
January 2011- June 2012
 
September 2012
 
$
6,600


 
The Company filed the following petition in 2012 with the PUCT to revise its fixed fuel factor pursuant to the fuel factor formula authorized in PUCT Docket No. 37690: 
Docket
No.
 
Date Filed
 
Date Approved
 
Increase (Decrease) in
Fuel Factor
 
Effective Billing
Month
40302
 
April 12, 2012
 
April 25, 2012
 
(18.5)%
 
May 2012

 
Generation CCN Filing. On May 2, 2012, the Company filed a petition with the PUCT requesting a CCN to construct a new generating facility to be located at a new plant site, the Montana Power Station, in east El Paso. The new facility will initially consist of two 88 MW simple-cycle aeroderivative combustion turbines, which will be powered by natural gas. The first unit is scheduled to become operational in 2014. On December 13, 2012, the PUCT issued a Final Order approving the requested CCN.
The Company has also filed two air permit applications for the Montana Power Station. One application was filed with the Texas Commission on Environmental Quality ("TCEQ") and a contested hearing on the merits of the application is scheduled for May 1, 2013, before the State Office of Administrative Hearings in Austin, Texas. Several parties, representing affected individuals as defined by TCEQ, have requested status in the hearing. The second air permit application is an EPA greenhouse permit application which remains under review. A final permit is expected from the EPA by August 2013 if there is no appeal. While the Company believes that the Montana Power Station complies with all air regulations, it cannot predict the final outcome of these applications.
Energy Efficiency Cost Recovery Factor ("EECRF"). On April 30, 2012, the Company filed an application to revise its EECRF and to establish revised energy efficiency goals and cost caps, pursuant to the Public Utility Regulatory Act ("PURA") Section 39.905. On September 20, 2012, the PUCT approved a unanimous settlement resolving all issues. The settlement allows the Company to recover $5.5 million in energy efficiency costs, revised the Company’s demand and energy goals and granted the Company’s request to increase its 2013 EECRF effective with billings in January 2013.
Military Base Discount Recovery Factor ("MBDRF"). On July 16, 2012, the Company filed a petition to revise its MBDRF. On November 16, 2012, the PUCT approved a unanimous stipulation and settlement, with the City of El Paso and Staff, which provides for the surcharge to be increased from 0.936% to 1.055% of customer bills. The revised MBDRF is designed to recover estimated discounts and the recovery of past under-recoveries spread over two years, totaling $4.6 million and is effective with December 2012 billings.
Other Required Approvals. The Company has obtained all other required approvals for recovery of fuel costs through fixed fuel factors, other tariffs and approvals as required by the PURA and the PUCT.
New Mexico Regulatory Matters
2009 New Mexico Stipulation. On December 10, 2009, the NMPRC issued a final order conditionally approving the stipulated rates in NMPRC Case No. 09-00171-UT. The stipulated rates went into effect with January 2010 bills.
Generation CCN Filing. On May 2, 2012, the Company filed a petition with the NMPRC requesting a CCN to construct a new generation facility to be located at a new plant site, the Montana Power Station, in east El Paso. The NMPRC approved the CCN on January 23, 2013.
2012 Annual Procurement Plan Pursuant to the Renewable Energy Act. On June 29, 2012, the Company filed its application for approval of its 2012 Annual Procurement Plan pursuant to the New Mexico Renewable Energy Act. On December 11, 2012, the NMPRC issued a final order approving the renewable procurement plan with modifications recommended by the Hearing Examiner. The plan sets out the Company's procurement of renewable resources and estimated costs for 2013 and 2014 to meet Renewable Portfolio Standards ("RPS") and resource diversity requirements. The approved plan provides for the RPS and diversity requirements for 2013 and 2014 to be met with a combination of previously approved resources and excused the Company from a requirement to make-up a deficiency in the "other" diversity requirement for 2011 and from meeting the "other" diversity requirement for the 2013 and 2014 compliance years. Costs for purchases of renewable energy delivered to the Company are recovered through the New Mexico Fuel and Purchased Power Cost Adjustment Clause ("FPPCAC") and purchases of renewable energy credits are recovered through base rates.
Long-Term Purchased Power Agreement with Macho Springs. On November 21, 2012, the Company filed an application with the NMPRC requesting approval of a Long-Term Purchase Power Agreement ("LTPPA") with Macho Springs Solar, LLC ("Macho Springs") to purchase energy from a 50 MW solar facility to be constructed by Macho Springs in the Company's New Mexico service territory. The Company also seeks approval of the recovery of costs associated with the LTPPA through the Company's FPPCAC. The hearing is scheduled to begin March 14, 2013 and a final order is expected by the end of May 2013.
Other Required Approvals. The Company has obtained all other required approvals for other tariffs, securities transactions, long-term resource plans, recovery of energy efficiency costs through a base rate rider and other approvals as required by the NMPRC.
Federal Regulatory Matters
Public Service Company of New Mexico's (“PNM”) 2010 Transmission Rate Case. On October 27, 2010, PNM filed a Notice of Transmission Rate Changes for transmission delivery services provided by PNM. These rates went into effect on June 1, 2011. The Company takes transmission service from PNM. On January 2, 2013, the FERC issued a letter order approving a unanimous stipulation and agreement. Pursuant to the stipulation, on January 31, 2013, PNM refunded $1.9 million, for amounts that PNM collected since June 1, 2011, in excess of settlement rates. This amount was recorded in the fourth quarter of 2012 as a reduction of transmission expense.
Other Required Approvals. The Company has obtained all required approvals for rates and tariffs, securities transactions and other approvals as required by the FERC.
Department of Energy ("DOE"). The DOE regulates the Company's exports of power to the Comisión Federal de Electricidad in Mexico pursuant to a license granted by the DOE and a presidential permit.

The DOE is authorized to assess operators of nuclear generating facilities a share of the costs of decommissioning the DOE's uranium enrichment facilities and for the ultimate costs of disposal of spent nuclear fuel. See Note E for discussion of spent fuel storage and disposal costs.




Sales for Resale

The Company provides firm capacity and associated energy to the RGEC pursuant to an ongoing contract with a two-year notice to terminate provision. The Company also provides network integrated transmission service to RGEC pursuant to the Company's Open Access Transmission Tariff ("OATT"). The contract includes a formula-based rate that is updated annually to recover non-fuel generation costs and a fuel adjustment clause designed to recover all eligible fuel and purchased power costs allocable to RGEC.