Oklahoma's second-largest utility is studying the wind. Public Service Co of Oklahoma (PSO), based in Tulsa, has leased four sites for measurement for a year or two, says consulting engineer Harold Walker. Two sites will then be monitored longer-term, he told the Daily Oklahoman. PSO is part of Central and South West Corp (CSW) of Texas, one of three utilities funded by the US Department of Energy and the Electric Power Research Institute for a demonstration wind farm. "Renewables resources like wind energy happen to be some of the cleanest fuels available for the generation of electricity," says Greg Tillman of PSO. "By applying the Oklahoma data to the results of the CSW system renewables project, we'll be able to predict how the wind generation equipment would perform in Oklahoma," he adds.