The United Kingdom, which has recently set a record for wind power meeting its demand, issued a security of supply alert earlier this week as wind power output was low due to calm weather. This event highlights the need of increased energy storage capacity able to balance power to the grid at times of strained supply, energy historian and expert Ellen R. Wald wrote in Forbes . On Tuesday, National Grid ESO issued an electricity margin notice (EMN) for the evening on Wednesday. “This is a routine signal that we send to the market to indicate that we’d like a larger cushion of spare capacity,” National Grid said. The grid operator was expecting tight margins on the UK electricity system because of low renewable output and the availability of generators over periods of the day with higher demand. “The tight margins on the electricity system are the result of […]