Despite the announced profits increase, British Gas owner Centrica would not rule out further rise in tariffs this winter, blaming "upward pressure on costs".
We will keep prices as low as we can for as long as we can. If prices do have to go up, we will delay it for as long as possible.
Mr Luff said the Government-backed ECO (Energy Companies Obligation) scheme, which helps customers with boiler repair or replacement or insulation costs, would "inevitably impact on customer bills ultimately".
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Commuters were also warned to expect travel chaos as Doris gathered speeds of nearly 90mph.
A man with 62 penalty points on his licence is among thousands of motorists allowed to drive despite exceeding the limit warranting a ban.
Storm Doris is set to bring severe weather across much of the UK on Thursday as heavy rain and strong winds push in from the west.