250.84—Prohibition of unauthorized transactions by registered holding companies.
Except as authorized by rule, regulation, or order of the Commission, no registered holding company shall—whether or not pursuant to a contract heretofore or hereafter entered into—perform any service or construction for, or sell any goods to, any associate company thereof which is a public utility company, a mutual service company, or a company engaged in the business of performing services or construction for, or selling goods to, associate public utility companies, or enter into any contract to do so.