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Landfill Methane Outreach Program

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Project Profile

Greentree High Btu Landfill Gas Energy Project

LMOP Award Winner
Kersey, Pennsylvania
End User(s):
Conectiv Energy Supply, Inc.
Veolia ES Greentree Landfill, LLC
Landfill Size:
18.5 million tons waste-in-place (2008)
Project Type:
High Btu
Project Size:
6,500 standard cubic feet per minute (scfm)
Environmental Benefits:
Carbon sequestered annually by 17,300 acres of pine or fir forests, annual greenhouse gas emissions from 15,500 passenger vehicles, or carbon dioxide emissions from 188,500 barrels of oil consumed. Annual energy savings equate to heating 22,100 homes. Estimated emissions reductions of 0.0221 million metric tons of carbon equivalents.
LMOP Partners Involved:
Air Liquide-MEDAL, AXD Service Industries Corp., Beacon Generating LLC, Custer Services, Inc., EMCOR Energy Services, SulfaTreat, Veolia ES Solid Waste, Inc.
Last Updated:

Photo of example of ALG’s patented wellhead boot.

The Greentree Landfill gas energy project spells innovation, from financing through implementation. Several innovative technologies ensure efficient collection and processing of natural gas quality landfill gas (LFG). Such innovation earned the Greentree Landfill gas energy project honors as a 2007 LMOP Project of the Year.

A newly designed and expanded gas collection system applies a constant vacuum, while patented wellhead boots work to prevent air intrusion. A multi-stage centrifugal blower gas compression system, designed and built by AXD Service Industries, provides compressed gas for the next stage in the process. Air Liquide-MEDAL's proprietary membrane technology removes 98 percent of the carbon dioxide and about half of the remaining oxygen. Finally, to deliver the LFG, project developers used a patented pipe fusion machine to construct seven miles of 12-inch HDPE pipeline in just three months.

The high Btu gas is transported to a utility where it is utilized in combined-cycle equipment to generate power. The project's highlights include:

  • Leachate recirculation stabilizes the waste and increases LFG production.
  • Project utilizes over 90 percent of LFG that was otherwise flared.
  • System can process over 15 million standard cubic feet of raw LFG per day.
  • System is expected to produce over 2 billion cubic feet of pipeline quality gas per year.
  • Renewable energy credits satisfy renewable energy portfolio standard requirements.

The Greentree Landfill succeeded in developing a high Btu project that could easily be replicated in other similar landfills across the country. The success of this project is already leading to the exploration of high Btu opportunities at other landfills.

Diversifying energy supplies by utilizing clean, indigenous resources helps to enhance energy security, reduce our dependence on imported fossil fuels and clean the air at the same time. —Daniel Desmond, former Deputy Secretary of the Pennsylvania Department of Environmental Protection's Office of Energy and Technology Deployment

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