In 1990 it was floated on the stock market as East Midlands Electricity plc, which went through several changes of ownership.

The board covered a large area: from Chesterfield in Derbyshire, to Newport Pagnell (near modern-day Milton Keynes), in Buckinghamshire, and from Coventry in the west to Skegness in the east.

The pre-war National Grid system was vastly expanded, and many new power stations were opened across the region.

Although operations continued as usual for a few years, the business began to be separated and broken up.

The electricity showroom and sales business merged with those of other companies into the Powerhouse chain, in 1994/5.