Madison, Wisconsin, has successfully operated a fleet of 62 electric buses through its harsh winter, overcoming past challenges with improved technology and infrastructure. The buses continued service on January 23 amid -4°F temperatures that closed the local university. This success offers a model for zero-emissions transit in cold climates.
In the fall of 2024, Madison's Metro Transit introduced 62 electric buses, a significant expansion from a troubled 2020 pilot with three Proterra models that suffered battery and maintenance issues in cold weather. Jonathan Mertzig, a member of the Madison Area Bus Advocates, recalled the earlier buses as “operationally... a nightmare,” with frequent alarms and breakdowns. Proterra's bankruptcy in 2024 further complicated parts sourcing, leading the agency to switch to New Flyer coaches.
The current fleet benefits from enhanced battery technology, with energy density rising about 7 percent annually over the past decade, according to Eric Kazyak, a mechanical engineer at the University of Wisconsin-Madison. Metro Transit installed overhead pantograph chargers on key routes, enabling quick top-offs during layovers. On Route A, an east-west Bus Rapid Transit line, buses recharge for 15 minutes at each end, covering up to 258 miles daily while dropping only 15 to 20 percent battery. Route B, running north-south, operates four hours before depot charging, retaining about 25 percent battery, with plans for future overhead chargers to extend service.
Even in extreme cold, performance remains strong; on January 23, when temperatures hit -4°F and shut down the University of Wisconsin-Madison, the buses ran without interruption. Cold weather reduces range by no more than 10 percent compared to summer. Maintenance manager Cody Hanna noted that 60 to 70 percent of the fleet operates at any time, unaffected by weather, though electric buses pose diagnostic challenges due to complex components like inverters and sensors.
Despite occasional issues—a charging system malfunction last year and non-weather-related service reductions in January—riders report reliability. Doctoral student Kira Breeden called the system “really good,” with few timeliness complaints beyond a pre-electric snowstorm in March 2024. Driver Shanell Hayes praised regenerative braking for safer handling on ice, while Rabbit Roberge appreciated the smoother, quieter ride.
This progress aligns with Madison's net-zero emissions pledge by 2050, amid national efforts where transportation contributes 28 percent of greenhouse gases. Metro Transit provides 9.1 million rides yearly, serving commuters like Mertzig who rely on it for health reasons. While pantograph chargers cost around $1.5 million each—matching bus prices—they prevent the need to triple Route A vehicles from 18 to 54. Other cold cities like Minneapolis, Duluth, Milwaukee, and Missoula are advancing similar transitions, though federal grants for zero-emission buses dropped to 3 percent last year under the Trump administration.
