The increase in wind and solar capacity in recent years has contributed to the overall reduction in demand. Higher volumes of on-site renewable capacity allow more generation to be provided off-grid, as homes and businesses generate their own electricity supply during windy or sunny spells. This reduces demand on the national transmission system. The high levels of solar availability during the summer season were a particularly strong influence on demand levels this year, as on-site solar panels increased embedded generation, reducing demand requirements for the transmission network.
During stormy weather conditions, installed wind capacity can now provide around 12GW of electricity to the grid. Average wind generation in the UK last month was 5.3GW a day; over 50% higher than in September 2017.
What happens when there’s no wind?
While high winds can reduce power demand, one of the biggest dangers to the National Grid electricity network is a high-demand scenario at a time when wind output is very low. Lighting has a bigger impact on electricity demand than heating, as the majority of home heating is gas-fired.
However, during severe cold periods, electricity demand does spike as additional electric heating is needed to cope with the very low temperatures. This scenario occurred during March as a result of the Beast from the East, when peak demand jumped around 10% as temperatures dropped. The cold snap also brought very high winds to the UK. Wind output at the time topped 10GW, which provided high levels of low-cost electricity to the grid. However, this renewable supply may not be available during another cold spell.
How could this impact energy bills?
Supply margins would be placed under significantly more stress during a similar cold snap this winter, if wind output was low or non-existent. This would require another 10GW of supply being provided by gas and coal plant or imports. Such a scenario is likely to require significant price rises in the Within-day and Day-ahead markets.
Renewable energy solutions with Utilitywise
If you’re interested in generating energy from your own renewables sources we can support your business to implement solar at your site.
A cost-effective and sustainable energy source, generating power from solar panels will cut your emissions, help the environment, and can be linked with a battery storage solution to maximise ROI. With our support you can install a battery solution as part of your wider energy strategy. Batteries can work in tandem with renewable energy sources such as solar or wind and can help you generate additional revenue via potentially lucrative demand side response (DSR) schemes.
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