The Chicago Tribune Tuesday reports that the commission thinks Illinois is vulnerable unless the state's electric utilities move quickly to improve tree trimming and embrace new energy sources.
The report also says the state's utilities lag in efforts to reduce demand, setting up the transmission system for an overload.
The recommendations, if implemented, are likely to increase utility costs, but Lt. Gov. Pat Quinn says it's also expensive for millions of people to lose electricity in a blackout.
The final report may not be completed until after Memorial Day.