MINNEAPOLIS — Electricity demand on the Midwest's grid is expected to be strong this summer, with hot weather and a growing economy sucking plenty of juice.
At the same time, electricity supplies are tightening. The upshot: The risk of rolling blackouts is elevated.
Underlying this vexing outlook is the grid's transition from fossil-fuel power to renewable energy. Power lost from retiring coal plants is exceeding the supply gained by new wind and solar farms.
