Hill Top Energy Center, LLC


Permitting of 620 MW combined-cycle power plant on a brownfield site


Greene County, Pennsylvania

Client Sector

Project Highlights

  • NNSR permitting
  • Air dispersion modeling
  • NPDES permitting
  • Pennsylvania general permits
  • USACE Section 10/404 nationwide 7 permit
  • Environmental justice

ECT provided Hill Top Energy Center, LLC with comprehensive environmental support services for the Hill Top Energy Center, a 1×1, natural gas-fired combined-cycle merchant power plant in Greene County, Pennsylvania, approximately 0.8 mile north of the Town of Nemacolin. ECT’s services included multimedia permitting on a brownfield site originally owned by the LTV coal mine. The project involved the greenfield development of the 41.7-acre site, 3.7 miles of 500-kV electrical transmission corridor, 4.9 miles of gas pipeline easement, 1.0 mile of water supply and discharge pipe easement, and 3.4 acres for a new water intake station site.

ECT’s support of the air quality permitting for the proposed facility included the following tasks:

  • Preparation of a regulatory applicability analysis
  • Class II area significant impact analysis
  • Class II area cumulative impact analysis
  • Class I area significant impact analysis & air quality-related values analysis
  • Control technology evaluations
  • Alternatives analysis as required by nonattainment new source review (NNSR)
  • Emissions offset demonstration analysis as required by NNSR
  • Compliance certification as required by NNSR
  • New source review (NSR) permit application package for submittal to Pennsylvania Department of Environmental Protection (PA DEP)
  • Negotiate with PA DEP on permit conditions for NSR permit

In addition, ECT provided support in the following areas:

  • Environmental justice
  • National Pollutant Discharge Elimination System (NPDES) permitting—discharge to the Monongahela River
  • The application included 316(b) analysis and stormwater run-off plans
  • Constructing the outfall structure, wastewater discharge pipeline, natural gas supply pipeline
  • Permitting the electrical transmission line using Pennsylvania General Permits (BWEW-GP-4, 5 and 8) and a U.S. Army Corps of Engineers (USACE) Section 10/404 Nationwide 7 permit
  • Conducting the assessments of ecological/ wetland resources, cultural resource and archaeological surveys prepared the permit application, and coordinating with the reviewing agencies for approvals