It depends on the source, however generally solar is one of the most expensive renewable energy sources, followed by biomass and geothermal. Despite this, by signing up for the RHI scheme run by the government, through using these renewable energies, you can get money back from the government, which helps subsidise any increased costs. The price of wood fuel to heat boilers is also considered relatively cheap, and the prices remain much more stable than that of oil.

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