PORTLAND, Maine (AP) — Ten more people have filed a complaint with Maine utility regulators opposing Central Maine Power Co.’s changeover to so-called “smart meters” on health grounds.

The complaint, filed in late February, seeks to suspend CMP’s smart-meter installation or force the company to offer an alternative to customers who don’t want the devices on their homes. The petition is the first one in Maine to focus exclusively on health concerns.

The Portland Press Herald says six petitions have been filed with the Maine Public Utilities Commission challenging the smart meters.

CMP says the meters, which send information through radio waves, don’t pose any health risks.

But critics say there’s no conclusive proof and that the question deserves more study.

CMP last September began the two-year job of installing 620,000 meters in Maine.