Estimated annual costs… …For the operation and maintenance of a 300kW plant Fees and overdraft interest US$666 Insurance US$5333 Legal/accounting US$1333 Property taxes US$2000 Provincial capital tax US$2666 Telephone US$466 Electricity US$400 Utility maintenance fee US$800 Water rental tax US$2466 Maintenance/miscellaneous US$4000 Contingency US$3200 Total US$23,330 The average annual revenue of such a 300kW plant is in the region of US$66,600. Operation and maintenance costs will use up about 35% of this.