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*Fuel Cells* use a completely different process, and work something like a battery, to get about 50% efficiency. This is generally better than burning, which gets about 30%.
Some countries make common use of %26quot;district heating%26quot; or %26quot;combined heat and power%26quot;. In these cases %26quot;waste%26quot; heat, not used by the power plant, may be used for space heating or hot water in the surrounding neigborhood or process industry. Years in the business, web search.
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