PJM Interconnection said in an Oct. 5 update to its pending power plant deactivation list that it got an Oct. 2 request to deactivate, as of Jan. 1, 2016, the 51-MW Perryman Unit 2 in Maryland.
PJM will conduct a reliability analysis to see if the unit is needed for grid support purposes. No information is given in the PJM list about the plant owner, but that would be Exelon Corp. (NYSE: EXC).
An Exelon subsidiary recently started commercial operation of a new 120-MW natural gas generating unit at the Perryman plant, located near Aberdeen Proving Ground in Maryland. Perryman Unit 6 increases the station’s full generating capacity to 475 MW. Exelon Generation had committed to increasing natural gas generation in Maryland as part of the company’s 2012 merger with Constellation Energy. The new unit consists of two simple-cycle, aero-derivative combustion turbines.
The Federal Energy Regulatory Commission on May 22 granted Exelon Generation a break needed because of the degraded condition of Unit 2 at the oil- and gas-fired Perryman plant. On April 29, Exelon Generation had filed a request for limited waiver of the deadline to submit data and documentation establishing the level of its Market Seller Offer Cap, and the corresponding deadlines for review by the Independent Market Monitor and PJM Interconnection, for the upcoming Base Residual Auction for the 2018/2019 Delivery Year. “For the good cause shown, the Commission grants Exelon’s requested waiver,” said the May 22 order.
Exelon owns and operates the Perryman Generating Station, which had historically consisted of four oil-fired combustion turbines and one fueled by natural gas or oil. The Perryman units are collectively capable of generating 353 MW. Exelon said that its Perryman Unit 2 experienced severe mechanical failure on Feb. 21 of this year. Exelon said it will take approximately nine months to make the extensive and costly repairs required to bring the unit back to operating status. Exelon stated that, in addition to issues with the compressor, electrical testing revealed the generator field and stator windings of Perryman Unit 2 are in degraded condition. Therefore, Perryman Unit 2 will be inoperable until the repairs are made. Exelon said it also identified the potential for the same problems to occur in Perryman units 1 and 4, thus necessitating preventive maintenance.