The Central Valley is the agricultural super power of the country (and the world), from agriculture, livestock, and water infrastructure (canals). But another feature are dairy digesters.
While the name makes me think of a milk processing plant, a dairy digester actually has a more innovative purpose: renewable natural gas. Dairy digesters convert manure into natural gas, which can be used to generate electricity on site, be stored and sold or injected directly into pipelines.
As the United States tries to become less dependent on foreign hydrocarbons, it is imperative we produce our own without destroying the environment (like with fracking). Thankfully, renewable fuels are already on the scene, though currently with automobile fuels (renewable jet fuel was recently tested and with success). Renewable fuels also have less of negative footprint than their non-renewable counterparts.