Pretty cool! "Kroger Co.'s anaerobic digester in Compton takes unsold food from Ralph's and Food 4 Less and converts it into 13 million kilowatt-hours of electricity a year." A powerful use for spoiled food - latimes.com
Or rather ethanol production, using waste food products, and then burning it. So inefficient solar power. Which I guess is delayed solar fusion, so yeah kind of.
Just to put this in perspective, this is equivalent to a 1.5MW power plant. Nice, but very small by grid standards.