In releasing a new report today on the PV sector's progress the Department of Energy and Climate Change stood by its controversial position that the UK could have 20GW of PV in place by 2020, up from about 2.5GW today.

The government's previously announced "central" energy forecast for 2020 predicted 10.7GW of PV by 2020. That compares to an 18GW prediction for offshore wind.

But,