Ten years is enough for methane credits on manure digesters, says analyst
The California Air Resources Board (CARB), which oversees the state's low-carbon fuel program, is considering a change in rules for the manure digesters on dairy farms that prevent methane emissions by capturing it for use as a transportation fuel. The digesters are eligible for up to 30 years of prevented-methane credits at present. CARB has proposed a reduction to 20 years for digesters built by 2030.