Plenty power storage methods

Sir, - Clark Cross (August 23) asked to be informed about powerstorage techniques.

I am surprised he has not heard of hydro-electric pumped-storage systems, compressed-air storage systems or the new breed of battery power plants.

All these systems store off-peak electricity.

A battery power plant

has been built in Bedfordshire, a larger one is planned for Northern Ireland while another is being developed on Gigha to store power from wind turbines. Bob Ferguson. North Muirton, Perth.