It is not unusual for sewage systems that use anerobic digesters as part of the treatment process to use some of the resulting methane for heating or power production – Nashua is one city that does it. But this is a new one to me: A Colorado city processes it into gas that can help run their truck fleet. (Guardian story is here.)

“But as far as we know, we are the only municipal wastewater facility in the nation producing biogas used as vehicle fuel,” said Dan Tonello, wastewater services manager for Grand Junction.

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