[arankine]

Back in high school, i visited the JET nuclear fusion project in Oxfordshire, they told us that they have to plan fusion experiments so they don't coincide with the end or commercial break of a soap, due to the tokamak requiring (i can't remember the exact figure) ~1 - 5% of the national grid's output.

[timthorn]

Yes, and even then they've stored massive amounts of energy in a couple of very large concrete flywheels to supplement the NG's output.