Very good initiative ! Jump in !

I'm asleep by then anyway so my lights will be off

Earth Hour 2009

Starting in New Zealand's remote Chatham Islands, thousands of cities, towns, and landmarks around the world will start to go dark for Earth Hour on Saturday evening. Up to a billion people worldwide are expected to participate in this global voluntary blackout by switching off their lights from 8:30 p.m. to 9:30 p.m. local time. The movement, sponsored by the conservation nonprofit WWF, is designed as a symbolic gesture in support of action against global warming. Now in its third year, Earth Hour has been attracting some high-profile advocates. United Nations Secretary-General Ban Ki-moon recently pledged his support for Earth Hour, saying it has the potential to be "the largest demonstration of public concern about climate change ever attempted."

I think Baron Samedi was thinking of the electric distribution grid operators who probably don't need this kind of deliberate disturbance, although they are warned and will be watching their screens carefully.

Correct. Yes they are aware and prepared, or at least I hope so.