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Sunnyvale does this! The "Sunnyvale Materials Recovery and Transfer Station" (SMaRT Station) is out by the bay, and there is a waste water treatment plant right next door. Methane is captured from "capped" landfills and is used to power the treatment plant. I believe the plant is nearly 100% powered by these captured gases.

Doesn't smell great over there, but it sure is interesting and pretty smart!

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