RE: Domestic electric supply for EV users
I agree that Ecotricity are worth supporting. But that being said, everyone's bills are currently funding Gov grants for renewables, and 'at the end of the day' I'm currently on 10.134p/kWh guaranteed until end 2014 and it doesn't look like there is anything near to challenge that.
Offpeak/Eco7 never worked out as being useful for my EV mileage - my monitor gadget on my charge station* daily average (I commute 3 or 4 times a week) is 5.8 kWh/day. We use about 25 kWh per day total, so it is adding ~25% to the bill. I don't think off peak works out as remotely useful to an average family household to charge an EV.
*(that is to say, my gadget - the Chargemaster unit is sending no data back to the monitoring software/website to report, for me to see)
Not only would off peak be no use to me on a cost basis, but the flexibility/convenience of being able to charge up for a few hours as soon as I get home without having to worry about whether I should wait for lower rates is good too.