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Regulation
3 Months Ended
Mar. 31, 2013
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. On April 12, 2012, the Company filed a request, which was designated Docket No. 40302, to decrease its fuel factor pursuant to its approved formula. The Company's revised application which decreased the fuel factor by 18.5% was approved on April 25, 2012, effective with May 2012 billings.
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. The Company filed on August 3, 2012 a request to refund $6.6 million of over-collected fuel costs, which filing was designated Docket No. 40622. The refund request was approved, and the refund was made during the month of September 2012. All such fuel revenue and expense activities are subject to periodic final review by the PUCT in fuel reconciliation proceedings.
Montana Power Station Air Permits. 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 early June 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 October 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. The Company has received Certificates of Convenience and Necessity to construct the first two units of this facility from both the PUCT and the NMPRC.
Transmission CCN Filings. On April 15, 2013, the Company filed two transmission line CCNs with the PUCT. Both of these transmission lines are needed to connect the Montana Power Station to the Company's 115kV transmission system so that the Montana Power Station can deliver its output to the Company's native load. Final orders in both of these filings are expected no later than April 2014.
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.
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 transmission system. The Company also seeks approval of the recovery of costs associated with the LTPPA through the Company's FPPCAC. A final order approving the LTPPA was received May 1, 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 Change 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.