This short report summarises Eti’s perspective on energy policy, the issues involved in transitioning to a low carbon economy by 2050, and the policy rethinks that will be needed. 2015’s UK Government ‘Reset’ on energy policy focussed on keeping the lights on. Subsequently, subsidies for renewables and bioenergy have been reduced and the Carbon Capture and Storage (CCS) competition cancelled. The future of large nuclear through Hinkley Point C remains uncertain, creating an environment where new investment in large scale power plants looks increasingly difficult. Without major new policy developments, it could be that by 2030 the only new low carbon generation built through contracts for difference (CfDs) will be “up to 10GW of new offshore wind” and solar PV. Both are intermittent, but to an extent predictable. Here we look at what the UK power system might be like without new nuclear orCCS in the 2020s.