I'm just trying to wrap my head around where these daily electrical power usage numbers are coming from...are you implying that 100,000,000 more people will start mining and the price of electricity will quadruple?
Its quite a simple argument. New miners will join as long as it is profitable to do so (and nobody can stop them from joining). And you keep your equipment running as long as your running costs are lower than the bitcoins generated. This two facts together ensure that in a long term situation, a large percentage of new bitcoins generated goes to pay for the running costs. So, just multiply 3600 (25 each 10 minutes) by Bitcoin price, and then take some portion (perhaps 50%) of that as an estimate of the total electricity usage.
Right now we are in a transitory state, with all the preorder troubles, non-deliveries of hardware, and the change of ASIC generations. You have to think about the steady state.
