Over the past few months we've replaced almost every regularly used light bulb in the house with some version of the energy-saver flourescents. They even make a very acceptable 3-way bulb.
Anyway, last year we averaged 102 kWh/day for the July period: this year, 84; a reduction of 30%. The cost per day went from $8.13 to $7.36. Not quite $24 for the month, but something.
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