Feed-in tariffs for small-scale solar PV currently support over 2GW of installed capacity in Great Britain, at an estimated cost of around ￡600 million/year. An agent-based model is used to assess feed-in tariff policy by exploring alternative historical pathways under alternative subsidy strategies, showing that more installation could have likely been achieved at a lower subsidy cost. Projections are made assessing future installation under the feed-in tariff scheme up to 2022, showing that the current tariffs are so low that they do little to encourage adoption which would not have happened in the short term (within five years) otherwise if commercial PV costs continue to fall.
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