British Gas warns of an increasing risk of power outages but the energy watchdog says ‘it will enhance confidence in the investment climate’

Britain has been warned that it faces an energy investment freeze and a heightened risk of blackouts after the industry watchdog called for the deepest ever investigation into the big six power suppliers.

Sam Laidlaw, chief executive of British Gas parent group Centrica, said the building of new power plants would be set back by the climate of uncertainty, increasing the threat of power shortages.