Energy giants told they have to address competition concerns or deal will be referred for full investigation. : Energy giants told they have to address competition concerns or deal will be referred for full investigation A planned merger between Npower and SSE could push up electricity prices for customers, the competition watchdog has warned. The Competition and Markets Authority (CMA) told the two energy giants they have to address its concerns or it will refer the deal for a full investigation. Several of UK’s “Big Six” gas and electric companies have come under fire in recent weeks after hiking prices.