The federal Public Utility Regulatory Policies Act (PURPA) is under review by state and federal authorities.
The formal complaints with state regulators allege Consumers Energy is violating federal PURPA rules.
Minnesota utilities are not disclosing avoided costs, arguing instead that the information constitutes a trade secret.
The chair of the Michigan Public Service Commission discusses how utility oversight has changed amid a shift toward renewable energy.
Independent power producers say recent rulings by Michigan regulators provide short-term development opportunities but also more uncertainty in the coming years as they negotiate contracts with a major utility.