TRAVERSE CITY, Mich. (AP) — A proposal to require that Michigan utilities steadily boost their use of renewable energy sources over the next dozen years is stirring a whirlwind of competing claims about costs, jobs and spinoff issues that could leave voters dizzy with confusion.

The measure on the Nov. 6 election ballot would require electricity suppliers to generate 25 percent of their power from wind, solar, biomass or hydropower by 2025. If approved, the policy would be added to the state constitution, meaning the legislature couldn’t overturn it.