EPA issues air permits for Four Corners SCR installations

The U.S. Environmental Protection Agency will publish a notice in the April 13 Federal Register about the fact that this past December it issued a final permit decision for a Clean Air Act Prevention of Significant Deterioration (PSD) permit and Minor New Source Review (NSR) Permit in Indian Country to Arizona Public Service (APS) for the construction of add-on pollution controls for the Four Corners Power Plant (FCPP).

The permits authorizes APS to construct and operate selective catalytic reduction (SCR) systems, including ancillary equipment, on two existing coal-fired units at FCPP. EPA Region 9 issued them on Dec. 19, 2014.

Said the APS website about the plant: “Four Corners Power Plant near Farmington, N.M. has been helping ensure reliable supply of energy for APS for 50 years. As a part of a continued diverse generation portfolio going forward, APS has completed a transaction with Southern California Edison to purchase Units 4 and 5, while closing the plant’s older, less efficient Units 1, 2 and 3. Additional emission controls will also be installed on the remaining units.”

Capacity at the coal-fired station was reduced by 560 MW due to the closure of the three units at the end of 2013, from 2,100 MW to 1,540 MW.

Said the Feb. 20 annual Form 10-K report of APS parent Pinnacle West Capital Corp.: “On August 6, 2012, EPA issued its final [Best Available Retrofit Technology] determination for Four Corners, which requires APS to install and operate SCR control technology on Units 4 and 5 by July 31, 2018. (APS retired Four Corners Units 1-3 on December 30, 2013.) APS estimates that its 63% share of the cost of these controls for Four Corners Units 4 and 5 would be at least $350 million. APS expects to incur certain of these costs during the 2015 through 2017 timeframe, which are included in our capital expenditure estimates.”

About Barry Cassell 20414 Articles
Barry Cassell is Chief Analyst for GenerationHub covering coal and emission controls issues, projects and policy. He has covered the coal and power generation industry for more than 24 years, beginning in November 2011 at GenerationHub and prior to that as editor of SNL Energy’s Coal Report. He was formerly with Coal Outlook for 15 years as the publication’s editor and contributing writer, and prior to that he was editor of Coal & Synfuels Technology and associate editor of The Energy Report. He has a bachelor’s degree from Central Michigan University.