Not sure what others pay for electricity, but in Northeast USA it is about 7 cents/KWH. I have run a system similar to wymjym's for the past year. Photos of my chiller blocks can be seen in the for sale forum. My electric bill never increased by more than $6 in one month, and it averaged about $2-3 more than when I had no pelts running.
There seems to be a lot of opinion about the high cost of running pelts, I simply disagree. Run a phase change setup and you will probably use as much or more electricity than a moderate peltier based cooling setup.
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