Publicly-run clean energy programmes are flourishing across the US, as states from California to Massachusetts and Ohio embrace the switch from fossil-fuel based power

Sewage and solar power may be odd bedfellows in the race to save the climate. But in Sonoma County, one hour north of San Francisco, an experiment is underway to install the nation’s largest floating solar array on a series of wastewater treatment ponds.

The sprawling 12.5MW Megawatt “flotovoltaic” park due for completion in 2016 covers 38 acres, or the area of 35 football fields, in a farming and vineyard region where real estate costs are at a premium.

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