Houston-based Thigpen Energy will once again become a stand-alone entity, less than a year after it merged with two other companies to form holding company TRF Energy Solutions. Effective Oct. 1, Thigpen Energy will spin out of TRF and become a portfolio investment for Intervale Capital LLC. The Boston- and Houston-based private equity firm bought Thigpen Energy in 2014. The spinoff comes after Thigpen Energy shifted its focus earlier this year away from the exploration and production fueling market....