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Oakland’s new school buses don’t just reduce pollution — they double as giant batteries

A new fleet of buses can send power back to the grid, stabilizing it instead of straining it.

The wheels on this bus do indeed go round and round. Its wipers swish. And its horn beeps. Hidden in its innards, though, is something special — a motor that doesn’t vroom but pairs with a burgeoning technology that could help the grid proliferate with renewable energy.

These new buses, developed by a company called Zum, ride clean and quiet because they’re fully electric. With them, California’s Oakland Unified School District just became the first major district in the United States to transition to 100 percent electrified buses. The vehicles are now transporting 1,300 students to and from school, replacing diesel-chugging buses that pollute the kids’ lungs and the neighborhoods with particulate matter. Like in other American cities, Oakland’s underserved areas tend to be closer to freeways and industrial activity, so air quality in those areas is already terrible compared to the city’s richer parts.

Pollution from buses and other vehicles contributes to chronic asthma among students, which leads to chronic absenteeism. Since Oakland Unified only provides bus services for its special-need students, the problem of missing school for preventable health issues is particularly acute for them. “We have already seen the data — more kids riding the buses, that means more of our most vulnerable who are not missing school,” said Kyla Johnson-Trammell, superintendent of Oakland Unified School District, during a press conference Tuesday. “That, over time, means they’re having more learning and achievement goes up.”

What’s more, a core challenge of weaning our society off fossil fuels is that utilities will need to produce more electricity, not less of it. “In some places, you’re talking about doubling the amount of energy needed,” said Kevin Schneider, an expert in power systems at Pacific Northwest National Laboratory, who isn’t involved in the Oakland project.