Feed in Tariff - This is available to anyone who installs a Solar PV system which is feeding back energy to the national grid. It is paid over a 20 year period and you apply for it through your energy provider. You will be required to have an Energy Performance Certificate done on your property.
Domestic Renewable Heat Incentive - This is available to anyone installing a replacement heat source in a single dwelling. Although there are a number of criteria which must be met in order to qualify. It is paid over a 7 year period. You will need to have a green deal assessment report. It is worth noting that there is a non domestic RHI available as well.
Green Deal - This is a government backed initiative which helps you make energy saving improvements to your home and find the best way to pay for them . You will need to have a Green Deal Assessment which will rate the property in terms of energy efficiency and reflect a household's actual energy use.