ARLINGTON — Waste Management is doubling capacity at its landfill gas power plant south of Arlington, generating more energy for homes and businesses 260 miles away in Seattle.
The Columbia Ridge Landfill and Recycling Center handles about 2 million tons of garbage per year, approximately one-third of which is shipped in by rail from Seattle Public Utilities. Once transferred into the dump, organic waste starts to decompose, releasing methane gas as a natural byproduct.
Gas is collected via a system of 85 wells at Columbia Ridge, and fed into a power plant on site where it is used as fuel to generate electricity. The plant recently added four new engines, which are expected to come online in August.