Abound Solar, another participant in the Department of Energy’s loan guarantee program, which is facing scrutiny, has hired Washington lobbyists because of that attention, a company spokesperson said.

The lobbying—by former government officials with ties to Congress and the Department of Energy—started in mid-October, about six weeks after Solyndra, the recipient of a $535 million loan from DOE, filed for bankruptcy. Like Solyndra, one of Abound Solar’s key investors is an Obama fund-raiser, although there is no evidence that the Obama administration favored the companies because of this connection.

The Abound investor is billionaire heiress Pat ...