Vietnam will supply power which could bring an end to blackouts in Cambodia in a deal brokered by Asian Development Bank which has put up half of total $100m (£61m) cost to erect pylons connecting power lines (and building substations) from Vietnam to Cambodia. It is the first segment of a national grid in Cambodian history. The new transmission lines run both ways; if, in the future, Cambodia has a power surplus it should be able to return the favour.