The rise is because of the hot weather and the shutdown of a power plant generator. The risk level refers to the likelihood that utilities would have to cut off power to certain business customers.
Officials at both We Energies and Alliant Energy say no reliability problems had been reported by late this morning. Officials at American Transmission, which operates Wisconsin's electric transmission grid, say they haven't heard of any problems either.
Temperatures ranged mostly from the mid 80s to the mid 90s yesterday and were forecast in the same range Wednesday.
Public Service Commission spokeswoman Linda Barth says one of two generators at the Columbia Energy Center near Portage is off-line.