A report by the Committee on Climate Change (CCC) claimed investment during the 2020s in a portfolio of technologies including renewables rather than gas-fired generation would save British consumers up to £45bn ($68bn).

But the CCC – which advises the Westminster government on emissions reduction – warned that more needs to be done to encourage investor confidence.

Echoing concerns from large renewables investors, it called on the government to set a carbon-intensity target for 2030 and set out clear levels of long-term support.

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