It might have something to do with "Kansas adopted the Renewable Energy Standards Act in 2009, which required the state’s utility companies to generate or purchase 20 percent of their energy from renewable sources – like wind and solar – by 2020." That is, they forced themselves to do it -- regardless of the price. Not saying it wasn't cheaper, but that they would have switched regardless of whether it were cheaper or not in the end.
The thing is that different energy sources are going to have different prices and efficacy depending on where you are. I'm sure that fossil fuels are still cheaper per kilowatt hour in northern Canada than solar is, and that wind power in San Francisco is going to be more expensive than in Texas.