Also, just to indicate the orders of magnitude: The German electiricty grid roughly operates at a power of 200 000 MW on average.

Source (the colorful graph in the middle of the page). (Be mindful that the absolute numbers in the graph are given in "MWh per 15 minutes" (power*time/time), so to get the Watt number (power) at any given time, one has to multiply the number by 4.)