The brand new visitor and education centre is powered by green energy, produced by its own wind generator.

BBC: Norfolk - From scrubland to wildlife haven

Auctioneer Jonathan Humbert said the bus, which can hold 35 passengers, has just 28, 000km (17, 398 miles) on the clock and it has its own auxiliary generator and air supply in case anyone attacked it.

BBC: Margaret Thatcher's "Battle Bus"

But if there is only one nearby mine that can be relied upon as a supplier, the electricity generator tends to own it.

ECONOMIST: Economics focus