Morocco has turned on its massive solar power plant in the town of Ourrzazate, on the edge of the Saharan desert. The plant already spans thousands of acres and is capable of generating up to 160 megawatts of power. It's already one of the biggest solar power grids in the world, capable of being seen from space. And it's only going to get bigger.

The current grid, called Noor I, is just the first phase of a planned project to bring renewable energy to millions living in Morocco. It will soon be followed by expansions, Noor II and Noor III, that will add even more mirrors to the existing plant. Once the project is complete around 2018, the entire grid will cover 6,000 acres. It will be capable of generating up to 580 megawatts of power, comparable to that of a small nuclear reactor.

http://www.theverge.com/2016/2/5/10923000/morocco-biggest-solar-power-plant-sahara

Interesting that it's not PV but a solar - thermal system (uses solar to heat water to power conventional turbines).

Someone will have to dust all those mirrors