Solarcentury, TGC Renewables, Lark Energy and Orta Solar Farms claim that a move by the Department of Energy and Climate Change (DECC) to withdraw RO support for solar firms over 5MW from April 2015 is unlawful.

The RO scheme, introduced in 2002, gives incentives for electricity suppliers in the UK to provide a rising share of power from renewables.

In May the DECC proposed an earlier end to RO subsidies for solar to prevent costs from soaring and to ensure there was sufficient cash for other low-carbon technologies.

However,