At Vander Woude Dairy near Merced, California, thousands of cows are doing what cows do, giving milk, eating feed, and creating methane. The greenhouse gas is a bi-product of the manure they leave behind.
But if that manure is generating more enthusiasm than you might normally expect, it's because of a mound a few hundred yards away. It's part of an expanding methane capture project developed by PG&E, California Energy Exchange, and Maas Energy.