Nebraska-based renewable energy company Tenaska has bought an Iowa biodiesel refinery. This article from the Omaha World Herald says the company acquired the Clinton County Bio Energy refinery in Clinton, Iowa, from a local group of investors, although Tenaska officials are being tight-lipped about the deal.

Terms weren’t disclosed. The centerpiece of the deal is the biodiesel plant on the Mississippi River with an annual capacity of 10 million gallons…

The acquisition marks Tenaska’s third renewables investment this year, after the February purchase of a stake in a California-based installer of residential rooftop solar panels and the purchase last month of a stake in a New Jersey company that specializes in commercial solar projects.

Tenaska had nearly $10 billion in sales in 2013, earning a spot on the Forbes magazine list of the biggest private firms.