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Cogeneration
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Renewables threaten power grid stability in the US, energy department claims
La Confluence in Lyon - Europe's biggest urban development project
Green 'trigeneration' system for off-grid homes
Seawater greenhouses: growing food in the world's driest regions
Smart meters: too little too late?
Minister for billion pound waste industry urged by peers
Electric crop fields
Combined heat and power boilers boost carbon savings for the home
A Stirling idea
Analysis: Always look on the bright side
Brewing biomass