(Los Angeles, California) Actor Brad Pitt has donated $100,000 to the group fighting a proposed amendment to the California Constitution to ban gay marriage, but a similar check from the state’s biggest utility has raised the ire of conservatives.

The head of the Pacific Justice Institute has filed a complaint with the California Public Utilities Commission over the $250,000 contribution by Pacific Gas and Electric Company to the group fighting to maintain the right for gays to marry.

PG&E turned the check over to “NO on 8″ in July.

“It is outrageous that a mammoth utility used my money to undermine the values of families in my community,” said Brad Dacus, who is the president of the Pacific Justice Institute.

“Proposition 8 has no relevance to the supply and distribution of energy services to its customers. As a corporation which has been given near monopoly status, its use of money extracted from customers to influence an item appearing on the ballot that does not promote the welfare of customers relative to energy is an abuse of trust,” the complaint states.

It asks the Public Utilities Commission to conduct an investigation and hold hearings as to the lawfulness of the contribution. In addition, the complaint requests that the “Commission take all appropriate actions to remedy this matter, including fines, available under the law.”

Under the California constitution, the commission has the power to conduct such an inquiry.

The commission has not yet responded.

Meanwhile, Pitt’s donation to “No on 8 ” is the largest to date by a major celebrity. Gay rights supporters say they hope it encourages other A-List stars to follow.

In a statement, Pitt said he was contributing to the fight against the proposed amendment “because no one has the right to deny another their life, even though they disagree with it, because everyone has the right to live the life they so desire if it doesn’t harm another and because discrimination has no place in America, my vote will be for equality and against Proposition 8.”