Grand Haven Public Safety Director Jeff Hawke said solicitors have to be licensed and that none are licensed at this time.
One resident said a woman wearing a yellow hardhat, with the word "Energy" on it, came to her home Wednesday morning and wanted to see her gas bill, her gas meter and her back yard.
The resident told the solicitor to come back later when her husband was at home.
Michigan Gas Utilities spokesperson Nick Krzeminski said people should not show anyone their bills because they contain account and meter numbers.
Although deregulation has allowed Customer Choice companies to operate in Michigan, customers should check for identification and make sure the company is licensed and is a legitimate company in the state of Michigan, he said.
Hawke said door-to-door solicitors should be able to show a City of Grand Haven solicitor's license with the City seal on it, the clerk's signature and a "paid" stamp.
The chief said be very cautious about allowing a solicitor into your home.
"Most business can be completed at the door or outside," he said.
"When in doubt, call 911 and ask that an officer respond to investigate," Hawke said. "Get a good description of suspicious persons and vehicles involved, including the license plate number."
Watch for a complete story in Friday's print and electronic editions of the Grand Haven Tribune.