In May, an India-made power transmission line to Kabul and a sub-station were opened, bringing 24-hour electricity to the capital for the first time in 17 years.

BBC: India: Afghanistan's influential ally

As more turbines are approved, the National Grid is legally obliged to extend the power infrastructure - and that's why there are plans for pylons and a sub-station to be built in Powys so that the power generated by wind farms is taken to the rest of the country.

BBC: What are the wind power issues?

In New York, the US financial capital, an explosion at a sub-station caused power outages and darkened most of downtown Manhattan as well as Westchester County and affected more than 650, 000 customers, power company Consolidated Edison said.

BBC: Sandy: Damage estimated at up to $20bn