Hummel Station re-works permitting for 1,064 MW project in Pennsylvania

natural gas fired power plant elp

Hummel Station LLC has submitted an application to the Pennsylvania Department of Environmental Protection for modification of an air permit plan approval that authorized the construction of three natural gas-fired combined-cycle combustion turbines coupled with heat recovery steam generators equipped with natural gas fired duct burners capable of producing 1,064 MW of electricity in Snyder County.

"The proposed modification of the plan approval is to remove the existing limitations of the operating hours of the plant contained in the existing plan approval due to the vacature of the greenhouse gas tailoring rule mandated by the U.S. Supreme Court," the department said in a notice of intent to approve this revision published in the April 4 Pennsylvania Bulletin. "On June 23, 2014, the US Supreme Court invalidated much of the 'GHG Tailoring Rule' that included Title V (Part 70) permitting and PSD permitting for 'non-anyway sources.'"

"The existing hours of operation limitation was imposed as a synthetic minor emission restriction in the plan approval due to the plant's potential greenhouse gas emissions that would have been in excess of the major emissions threshold. The annual emission limitations for the air contaminants specified in conditions 3, 4 and 5 below are proposed to be increased, which is based on 8,760 hours of operation.

"The proposed plan approval also authorizes to modify the configuration of the steam generators from 2X3 and 1X1 to 3X1. The one (1) new steam generator will replace the existing four (4) steam generators. Additionally, the proposed plan approval also includes construction and operation of an emergency diesel fire pump and an emergency generator."

The department's review of the information submitted by Hummel Station LLC indicates that the proposed modifications will meet all applicable air quality regulatory requirements pertaining to air contamination sources and the emission of air contaminants, including best available technology requirements. Based on these findings, the department intends to approve the application and issue a plan approval for the modification of certain conditions in the prior plan approval. The facility is a major (Title V) facility.

Under this permitting, the company can construct and operate one of two options.

•The first option consists of constructing three Siemens 5000F5ee DLN natural-gas-fired CTs with STs. Each unit will be equipped with natural-gas-fired DBs and HRSGs. The maximum heat input rating of each CT is 2,381 MMBtus/hr and 2,145 MMBtus/hr. Each DB will have a maximum heat input rating of 204.1 MMBtus/hr.

•The second option consists of constructing three General Electric model 7FA.05 DLN natural-gas-fired CTs with STs. Each unit will be equipped with natural-gas-fired DBs and HRSGs. The maximum heat input rating of each CT is 2,254 MMBtus/hr and 2,040 MMBtus/hr. Each DB will have a maximum heat input rating of 267.3 MMBtus/hr.

Panda Power Funds had announced on Feb. 17 that it has entered into a joint venture with Sunbury Generation LP to develop, finance, construct and operate this power plant. The Hummel Station facility will occupy an 18-acre parcel of the 192-acre Keystone Opportunity Expansion Zone at the site of the recently-retired Sunbury coal-fired power plant. Hummel Station is expected to be one of the largest coal-to-gas conversion projects in the United States. The new plant is expected to supply large power markets, including Philadelphia and New York City, when it enters commercial operations in the second half of 2017.

The facility’s access to Marcellus Shale gas through the Marc I, Regency and Transcontinental regional gas pipelines is expected to provide Hummel Station with a significant operating cost advantage, Panda noted. The plant will interconnect to the pipelines through a 35-mile lateral that will be constructed by a subsidiary of UGI Energy Services.

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