LONDON, Jan 5 (Reuters) - Britain needs a better supply of cheap and affordable energy, Prime Minister Boris Johnson said on Wednesday. Asked by a lawmaker in parliament whether he could do more to help cushion rising energy costs, including a review of the renewable energy levies on bills, Johnson said: "We are determined to do what we can to help people through this pandemic and we will." "What we must do above all is make sure this country has a better supply of cheap and affordable energy."