CPS Energy recently discovered about a quarter of the trailers at a mobile home park off Mission Road had illegal electric connections.
Power was cut to residents there, but as of Wednesday afternoon, CPS officials said power had been restored.
It all came to light June 13 when a new resident tried to get electric service.
"There were people who were already using electricity service. There were air conditioners going. There was electricity being used," said Christine Patmon, with CPS Energy.
"I'm not paying for someone else's problems. I can't afford it. I've got a family to provide for. I can't do that," said Cary Pedrotti, who said he was not aware the meter box had been tampered with.
Pedrotti said he was told he'd have to pay a fine of more than $300 to restore service, and he doesn't think he should have to pay.
His wife, Amanda Pedrotti, said at seven months pregnant, she is trying to stay in the shade or take their son to visit friends and family, because the problem could not have come at a worse time.
"The doctor told me for me to stay out of the heat, because I'm having these fake contractions," she said.
CPS asked the owner of the mobile home park to fix bad wiring and bring everything up to code.
After a first inspection, there were wires that needed insulation and copper and aluminum wiring mixed.
Those problems should be fixed, but CPS Energy said some families still hadn't applied for service, and cannot get electricity until they do.
CPS Energy officials said a million dollars worth of service is stolen each year, and rate-payers end up footing the bill.
"Theft of service is a serious issue, and we can't give away free electricity. By state law, we can't do it," Patmon said.
All mobile homes have had their power restored, except for two, which a CPS spokeswoman said did not get their power from CPS.