MGE Energy's earnings jumped 40 percent in the first quarter of 2013 compared to the same period last year.
The parent company of Madison Gas & Electric said colder temperatures this winter helped fuel the increase.
MGE had net income of $22.6 million, or 98 cents a share, on revenues of $167.2 million for the three months that ended March 31. That's up from net income of $16 million, or 69 cents a share, on revenues of $149.3 million for the 2012 first quarter.
Natural gas sales were 27 percent higher than a year ago as customers used more heat, MGE said. In March, for example, the average temperature was 26.9 degrees, compared to 50.4 degrees in March 2012, the utility said. The normal average temperature in March is 35.3 degrees.