The supply of gas to the UK energy mix is very reliable. Under normal circumstances, 90% of gas-fired capacity can be assumed available to meet peak demand for electricity.
Fossil fuels such as gas store energy, which can be converted into electricity on demand by burning them in a power station. Given a secure supply of fuel, gas-fired power stations can rapidly increase and decrease their output in response to demand.
The reliability of gas as an energy source improves the reliability of our overall energy supply. When weather conditions restrict the ability of intermittent energy sources such as wind to generate electricity, gas-fired power stations can increase their output to make up the shortfall. This ensures there is always enough electricity being generated to meet demand.