[nrki]

300MJ ~= 83kWh which is like, $2000 in CA

[IanCal]

I think you're out by some orders of magnitude. With the current energy issues in the UK it'd be under £100. Other things suggest in California it's more like 20 cents per kWh so were you thinking ~$20?

[nrki]

You're right of course, messing up my units again.