The world’s largest concentrated solar power plant has been switched on in Abu Dhabi recently. At a cost of about $600 million, it covers almost a square mile and will generate enough electricity to power around 20,000 homes.
Read more at inhabitat.
Don’t expect this ‘world’s largest’ title to last though. California will soon be home to some mega-plants, each powering around 100,000 homes (though not expected to be operational until 2016).