A top Republican is sounding his displeasure with a two-month electric grid study that Energy Secretary Rick Perry is developing, calling it “hastily developed” and anti-renewable energy.

“I’m concerned that a hastily developed study, which appears to pre-determine that variable, renewable sources such as wind have undermined grid reliability, will not be viewed as credible, relevant or worthy of valuable taxpayer resources,” Sen. Chuck Grassley, R-Iowa, wrote in a letter to Perry Wednesday.