Stats for electricity usage may need to be updated
http://blockchain.info/statsElectricity consumption is estimated based on power consumption of 650 Watts per gigahash
http://www.bloomberg.com/news/2013-04-12/virtual-bitcoin-mining-is-a-real-world-environmental-disaster.htmlBlockchain.info, a site that tracks data on Bitcoin mining, estimates that in just the last 24 hours, miners used about $147,000 of electricity just to run their hardware, assuming an average price of 15 cents per kilowatt hour (a little higher than the U.S. average, lower than some high cost areas like California).
Not a miner, so no expert but probably need to consider FPGAs and ASICs now.
650 W/Ghash is probably from GPUs
FPGAs maybe 50 W/Ghash
ASICs maybe 10 W/Ghash
from my rough estimations looking at some numbers I've seen but open to correction.
No idea what the relative % of the hashing power each type of mining makes up.