We Energies may shut down its Presque Isle Power Plant in Marquette after losing more than 80 percent of its energy demand when two mines switched to alternative energy suppliers. The mines, who paid $120 million in electricity costs last year, indicated their rates had gone up 110 percent in five years.

The electrical costs for their new electrical supply will be 17 to 26 percent lower. The fate of the power plant, which last year was the subject of a retrofit agreement between We Energies and Wolverine Power Cooperative, may depend on the analysis and needs of the MISO power grid.