Cyclone fans can thank the wind - and wind energy producers - for offsetting their hefty carbon footprint of electricity used at tonight's game at Jack Trice Stadium. Cyclone Sports Properties will use renewable energy certificates from MidAmerican Energy Co.'s Pomeroy wind farm in Pocahantas County to offset the greenhouse gas emissions associated with the electricity used during tailgating, the game and post-game activities - the equivalent of about 20,000 kilowatt hours. The average U.S. household uses 11,280 kwh per year. One renewable energy certificate represents 1,000 kilowatt-hours of renewable electricity placed on the grid. MidAmerican Energy has partnered for the past several years with transmission provider ITC Midwest LLC and sports programmer Cyclone Sports Properties to sponsor the wind energy awareness campaign. Because Texas and Iowa rank among the top three states in wind-powered energy production, the campaign is always done during a home game with Texas, MidAmerican Energy spokeswoman Tina Potthoff said.