MGE, Speedway Open Area's First Public CNG Fueling Site

Madison, Wis., March 1, 2013--South-central Wisconsin's first compressed natural gas (CNG) fueling site is now open to the public at the Speedway convenience store located at 2500 Royal Ave., Monona. Madison Gas and Electric (MGE) supplies the CNG to the station, which will serve local drivers and also provide fuel for cars and trucks traveling past Madison along Interstates 90/94/39. It is open every day, 24 hours.

"This pilot project will serve local businesses with fleets that are interested in using CNG because of its reduced costs and emissions," said Debbie Branson, MGE's business development manager. "It is another way we can serve our customers and help our local economy."

CNG vehicles save up to 50% on fuel costs compared to gasoline-powered vehicles and have fewer emissions. With the stability of lower natural gas prices and abundant domestic supplies, CNG can provide a clean, affordable option to gasoline.

"We are excited to provide a new fueling alternative to our fleet customers, and are appreciative of our partnership with Madison Gas and Electric to bring this innovative opportunity to fruition," said Jim Dwenger, Speedway region manager.

There are approximately 25 public CNG stations in Wisconsin. Most are near Milwaukee and La Crosse. Now drivers traveling between Chicago and Milwaukee and the Twin Cities will have a convenient option. Speedway will purchase the CNG from MGE and facilitate the sales transaction with the public.

MGE was awarded a grant from the State of Wisconsin and federal Department of Energy to help offset some of the equipment and construction costs. Construction began in the fall of 2012 and was completed in January 2013.

For information on using CNG for fleet vehicles, the Speedway site or CNG in general, visit www.mge.com/cng.

About Madison Gas and Electric
MGE generates and distributes electricity to 140,000 customers in Dane County, Wis., and purchases and distributes natural gas to 145,000 customers in seven south-central and western Wisconsin counties. MGE's parent company is MGE Energy, Inc. (Nasdaq: MGEE). The company's roots in the Madison area date back more than 150 years.

About Speedway LLC
Speedway LLC, headquartered in Enon, Ohio, is the nation's fourth largest company-owned and -operated convenience store chain with approximately 1,460 stores located in seven states in the Midwest. Speedway is an indirect wholly owned subsidiary of Marathon Petroleum Corp. (NYSE: MPC). For further information about Speedway, visit www.speedway.com.