3000 x 9 + 2 GPU clients at 6000 each
27,000 + 12,000 = 39 Kwhrs per day x 30 days = 1170 Kwhs per month, plus
1 ton A/C unit to keep it all cooled down
10 Amps x 120 volts = 1200 Watts x 24 hours = 28800 Watts x 30 days = 864 Kwhs
2034 Kwhs per month x .08 cents per Kwh = ~ $200 per month electricity.
Sound about right?