If solar power is to make up much of the world's electricity output in future, as supporters of alternative energy hope it will, a lot of land will be needed for the power stations.

ECONOMIST: Solar energy

Pakistan has officially opened its second nuclear power plant as part of its programme to meet the country's future electricity demands.

BBC: Pakistan opens Chinese-aided nuclear plant

Northern Powergrid's chief executive Phil Jones said the investment was to "prepare the UK's electricity networks for the move to smarter power grids needed for a long-term low carbon future".

BBC: Generic water works