The World Bank’s board has agreed to end a longstanding ban on funding nuclear energy projects in developing countries as part of a broader push to meet rising electricity needs, the bank’s president Ajay Banga said on Wednesday. Banga outlined the bank’s revised energy strategy in an email to staff after what he called a constructive discussion with the board on Tuesday. He said the board was not yet in agreement on whether the bank should engage in funding the production of natural gas, and if so, under what circumstances.