With local gasoline prices peaking at more than $3 per gallon last year, and the prices people are paying right now for fuel oil to heat their homes, few can question the wisdom of reducing our reliance on foreign energy sources. The Mill Seat Landfill is in a unique position to make a meaningful contribution to this effort by harnessing the landfill gas that is being produced onsite, and we’re excited to begin operating our gas-to-electricity facility, which went online in July 2007.

Landfill gas is a naturally occurring byproduct of the waste thrown out every day. Each person in the United States generates about 4.5 pounds of waste per day, and more than 50% of this waste is managed in municipal solid waste landfills such as Mill Seat Landfill. Organic materials disposed of in a landfill, including food, and sludge from the wastewater treatment process, help to promote the decomposition process. Landfill gas typically consists of about 50% methane (which is the primary component of natural gas) and 50% carbon dioxide, and so this gas is not very different from the natural gas that comes to your home through your local utility.

Mill Seat is currently managing more than 2,000 cubic feet per minute of landfill gas. This gas is collected and removed through a series of wells located throughout the landfill. To install a gas well, special equipment is used to drill into the waste and a pipe with holes, surrounded by gravel, is inserted to collect the gas flow. The wells are all connected to a central header pipeline, where the gas is currently channeled to a flare for combustion.

With its relatively high energy content, landfill gas represents a low-cost fuel that can be used to power electrical generators. Managing this byproduct as a “green” energy source offers the opportunity to capitalize on an alternative source of electrical power.

With a large and growing number of beneficial-use gas projects around the country, Waste Management is a nationwide leader in turning landfill gas into electrical power. The company has dozens of related projects operating in 19 states.

The company is continuing to spread this technology, and a number of new projects are in the planning stages around the country, including the plant at Mill Seat Landfill. “We have a real sense of urgency about this project,” says District Manager Jeff Richardson. “Our calculations suggest that our new landfill gas-to-electricity facility here could place the annual equivalent of more than 110,000 barrels of oil to work producing electricity. We’re excited and anxious to extend our industry leadership in this important area; look for updates on this project here and in future issues of Mill Seat Matters.”

UPDATE: Engines Arrive – September 2006

The engines for the landfill gas-to-electricity facility have arrived at Mill Seat Landfill. 

Please refer to the photograph of the engine as it arrived.

Construction Begins - October 2006

Groundbreaking for the landfill gas-to-electricity facility occurred this fall.  Photographs of the stages of construction are provided. Stay tuned for more information and photographs here.

Landfill Gas-to-Electricity Facility Goes Online - July 2007

Photos of completed facility will be available here soon.