Gas prices have skyrocketed in Minnesota over the past few days, and US Senator Amy Klobuchar is asking the Department of Energy to find ways to prevent the situation from happening again. The high gas prices are being blamed on reduced capacity after the closures of three large refineries in the Chicago area. Klobuchar says she doesn’t have a specific timetable for when the refineries in question will reopen. Gas prices topped $4 a gallon in Minnesota on Thursday, and are currently (SAT) averaging $4.29 per-gallon in the state. In New Ulm regular unleaded is also at $4.29 a gallon. The current national average is $3.67 per-gallon.