Britain will next week flick the switch on a new wholesale electricity market, drastically changing the way power is bought and sold in a move designed to foster competition and cut energy bills. Barring a last-minute system failure the New Electricity Trading Arrangements (NETA) will go live on March 27, sweeping aside a much-criticised Electricity Pool to make way for commodity-style dealing in Britain's 7.5 billion pound ($10.69 billion) wholesale power market.