Solar PV cells do not need direct sunlight to operate effectively and with the levels of sunshine in the borders they will perform very well. Solar Thermal will be most effective in summer when there is most sunshine.
With highly variable wind speeds over the region it is difficult to generalise, but there will be locations that will be suitable for generating electricity from wind, subject to planning consent.
The Borders are certainly warm enough for both Ground Source Heat Pumps and Air Source Heat Pumps to operate effectively. Manufactures claim that some air source heat pumps can operate effectively down to -15 °C.
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Find an installer in the Borders
Most green energy schemes required that you have an MCS accredited installer fit the system before you can qualify for the relevant government grant or subsidy, like the Feed-In Tariff or the Renewable Heat Incentive and RHPP.
Grant and subsidies in the Borders
Subsidies like the Feed-In Tariff or the Renewable Heat Incentive and RHPP are universally available and depend on the renewable technology you are installing. Grants like the ECO (Energy Company Obligation) and are also available to everyone but the amount you receive will depend on your circumstances.