George Hershman, president of Swinerton Renewable Energy (SRE) and SOLV Inc., two renewable energy units of Swinerton Inc., will become CEO of SOLV Energy LLC, which is set to be a spin-off of the contractor in an acquisition by private equity firm American Securities LLC. That firm announced a “definitive agreement” on Sept. 20 to acquire the units, but declined to disclose or confirm when the deal will close or its financial terms.