The official Lucy Lawless fan club site has posted the following:
Saturday, March 27th, is Earth Hour. What Earth Hour is, is a worldwide effort to give Mother Nature a breather. How do you take part? Simple, at 8:30pm your time simply cut off any un-necessary uses of electricity in your home, for ONE HOUR. Things like the refrigerator are exempt. But think of what you can turn off. The TV, the computer, any lights that are just on so that your house isn't "in the dark." It's not difficult.
And if you want to send your name/city/country to Sharon at email@example.com She will make a list and pass it along to Lucy.
The deadline for messages is March 31.