Sioux City Adds 15 Electric School Buses, Cuts Emissions

Students in Sioux City, Iowa are about to experience something remarkably different on their morning commute: silence.

The Sioux City Community School District has started rolling out 15 new electric school buses that glide smoothly down streets without the rumble and roar of traditional diesel engines. Nine buses have already arrived, with six more expected in the next two months.

The $5.9 million investment was made possible by a $5.6 million Environmental Protection Agency grant. The remaining funds came from the district's equipment levy, making this transformation nearly free for local taxpayers.

Each electric bus costs $395,000 compared to $170,000 for a diesel model. But district officials say the math works out over time because electric buses need far less maintenance and no expensive fuel.

The numbers already prove it. In just the limited testing and training done so far, the district has used only $90 in electricity to replace what would have been $650 in diesel fuel.

Transportation supervisor Doug Stewart took reporters on a test ride to show off the difference. Under the hood sits a battery management system instead of a traditional engine. The batteries run along the bottom and behind the system, powering a surprisingly smooth, quiet ride.

"They're very smooth. They ride a lot smoother than diesel buses because of weight displacement," Stewart explained. "They're quieter, much quieter."

The district chose to wait for second-generation models that include air conditioning, a feature the first versions lacked. Director of Operations Tim Paul sees this as an investment in proven, growing technology.

The Ripple Effect

The environmental impact started immediately. Just nine buses doing training runs have already reduced carbon emissions by 1,600 pounds of CO2. That's equivalent to the emissions from a 1,700-mile passenger car trip.

The buses work perfectly for in-town routes but have limitations. Highway driving drains batteries faster, making long trips to places like Omaha impractical. Cold weather also affects charging time, stretching it from three hours at 72 degrees to up to 10 hours below 20 degrees.

But winter mornings won't slow these buses down. Unlike diesel buses that need warming up, electric buses stay plugged in overnight and are ready the moment drivers turn the key.

The grant required the district to retire four older diesel buses that lacked modern emission filters. Those buses will be destroyed and replaced by the cleaner models.

Drivers are now getting special training to maximize the buses' regenerative braking system, which helps recharge batteries while driving. Stewart wants everyone comfortable behind the wheel to "get the most bang for our buck out of the EV itself."

When all 15 buses arrive, they'll make up a quarter of Sioux City's school transportation fleet. The quiet revolution in student transportation has officially begun.