Energy Secretary Rick Perry is planning to step down from his post by the end of the year, according to four individuals briefed on his plans, making him one of about a dozen Cabinet members to leave their post during President Trump’s administration.

Perry probably will return to the private sector, one of these individuals said. All four spoke on the condition of anonymity because no formal announcement has been made.

The former Texas governor, who has touted fossil fuels but also research into alternative energy since taking office, has not enacted the same sweeping policy changes as his counterparts at the Interior Department and the Environmental Protection Agency.