Growth in low carbon power generation must be doubled in the 2020s if the UK is to meet its climate change targets.

That must be done along with replacing old nuclear power plants as they retire, according to new analysis from Carbon Brief, which suggests the amount of electricity generated by low carbon sources such as wind, solar, nuclear, hydro and biomass stalled in 2019.

It found low carbon electricity output rose by just 1TWh – less than 1% – last year, representing the smallest annual increase in a decade, where annual growth averaged 9TWh.

The report adds reducing pollution to less than 100g of CO2 per kWh (gCO2/kWh) and meeting expected demand as electrification of transport and heating is increased will require low carbon supplies to increase by 15TWh each year until 2030.

For context, the 3.2GW Hinkley C nuclear plant being built in Somerset will generate around 25TWh once completed around 2026 and the world’s largest offshore wind farm, the 1.2GW Hornsea One scheme off the Yorkshire coast, will generate around 5TWh each year.

With old nuclear power plants such as Hunterston and Dungeness set to retire over the next decade, they will need to be replaced by other low carbon sources of electricity.