By Bellamy Pailthorp
On a dairy farm in Monroe, Washington, a cement pit full of swirling brown liquid flows into an underground tank. State environmental goals, Indigenous-led carbon reduction initiatives and hydrogen energy technology are also swirling around this dairy digester, full of cow manure and food waste.
Washington state is investing $22 million in dairy digesters, part of the 2023-2025 budget for the state's Climate Commitment Act. Based on a new report, they’re currently considered one of the most effective climate investments states can make.
Dairy digesters capture the methane that comes from cow manure and other organic waste as it decomposes and turn it into useful renewable energy.
The report, from the California Air Resources Board, showed that their dairy digester program was the most cost-effective carbon reduction initiative they have implemented. It used just over 2% of California’s climate investments while producing nearly 30% of the state’s greenhouse gas reduction.
However, a successful partnership between the Tulalip Tribes and a dairy farm in Monroe started long before Washington had a cap on carbon or revenue from the sale of carbon emissions permits to invest. It’s now a model for farms statewide that want to add digesters to lower their greenhouse gas emissions.
Tribal delegation touring successful low-carbon projects
At the Werkhoven Dairy in Monroe earlier this year, operator Jon Van Nieuwenhuyzen stood next to the big, cement-lined pool, full of that pungent brown liquid. He said about 85,000 gallons a day of manure and food waste get washed in there and warmed up to 100 degrees.
“What the digester is, essentially, is a cow's rumen…it’s just a large cow’s stomach,” Van Nieuwenhuyzen said.
He was giving a tour to a tribal delegation that’s studying Indigenous-led climate solutions. This project, Qualco Energy, started operating in 2008.
It's a collaboration between the dairy, the nearby Tulalip Tribes and since 2014, Snohomish County PUD. The utility pays Qualco Energy for the methane that’s captured in the digester to run a generator that provides renewable power for nearly 700 homes.
The process also produces high-quality liquid fertilizer for farmers that Qualco Energy can sell to offset its costs. In December, the partnership paid off the government bond that allowed them to build the digester, thanks to all the income the project has brought in.
Common ground in stewardship of the land
This joint effort started mainly as a way to keep manure from running off into the nearby Skykomish and Snoqualmie Rivers. Before the digester was in place, the farmers would spread it on their fields for up to 18 months, waiting for it to decompose. And it would often ruin habitat for endangered salmon, said Daryl Williams with the Tulalip Tribes.
“So it helps us keep nutrients out of our watershed and helps the farmers use their nutrients more efficiently,” Williams said. “Generating clean energy or renewable energy is just a byproduct for us.”
Historically, tribes and farmers in Washington often haven't gotten along. So the most important outcome of this partnership for them is the common ground they found — in stewardship of the land, Williams said.
Yet the value of its clean energy has raised the profile of the project. And it’s about to get even cleaner. Next year, Qualco Energy is getting technology for a pilot project that will convert their methane into pure hydrogen.
New tech will make this project even cleaner
Clean tech business mentor Mike Robinson, from the University of Washington, brought along a small jar of the carbon granules that will be left over from the process. He passed it around during the tour.
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