Say, LED bulbs, combined heat and power boilers, fuel cells, whatever.

FORBES: Green Energy Economics in Action

The heat is supplied by sources that range from waste-to-energy facilities and biomass boilers to micro-CHP fuel cells and solar-thermal arrays.

FORBES: Distributed Energy Delivers Big, Green Results in London

The forum wants pensioners' incomes increased through a variety of means including higher state pensions, an increase in winter fuel payments, a reduction in tax on boilers and radiators, and bills that are easier to understand.

BBC: Pensioners Forum Wales urges fuel poverty incomes boost

It is a flexible fuel, capable of heating homes, fuelling industrial boilers and providing feedstock for the petrochemicals industry, where it is turned into plastics, fertiliser and other useful stuff.

ECONOMIST: An unconventional bonanza

Turning fossil-fuel plants on and off adds inefficiencies, producing carbon emissions just to heat up boilers before energy production can begin.

FORBES: Wind Power May Not Reduce Carbon Emissions As Expected: Argonne

It said basic energy-efficiency measures such as loft and cavity insulation, double glazing and new boilers had prevented up to 35, 000 Scottish households from falling into fuel poverty over the past year.

BBC: Fuel poverty affecting more Scottish households