Sonoma County electric buses will make up 49% of its transit fleet by the end of 2026, after a 7 bus, 8,750,000 dollar purchase

The federal rule behind Sonoma County electric buses 2026

A federal rule forces the change behind Sonoma County electric buses 2026. Federal Transit Administration rules require a transit bus to run at least 12 years before an agency can replace it, and Sonoma County says the compressed natural gas buses it now runs have already passed that mark. The Board of Supervisors approved 7 new battery electric buses in November 2024, at a total cost of 8,750,000 dollars. The buses arrive in November 2026, and the county says that delivery will bring the 49 bus fleet to about 49% electric power.

David Rabbitt, chair of the Sonoma County Board of Supervisors, said the purchase continues a shift the county started decades ago.

Sonoma County Transit has been a leader in clean-fuel and low-emission buses since 1996 when it began transitioning from diesel power to natural gas power.

David Rabbitt, chair of the Sonoma County Board of Supervisors. Source 1.

Seven buses, 8,750,000 dollars, and the routes they will run

The 7 buses will run the longest routes in the system, Routes 20 and 30 between Monte Rio, Santa Rosa and Sonoma, and Routes 44, 48 and 60 between Petaluma, Santa Rosa and Cloverdale. Each bus must travel at least 240 miles on a single charge to cover those distances. The net cost works out to 1,250,000 dollars per bus, a figure Gillig, the manufacturer, states directly. Gillig says it has supplied approximately 500 electric buses to transit agencies nationwide since 2019, with 20% of that total going to California operators, about 100 buses by a calculation this site made from that percentage, a number Gillig does not state directly.

State and federal money paying for the switch

Three sources are paying for the buses, the Federal Transit Administration, the state Transit and Intercity Rail Capital Program and county funds. California created that state program with Senate Bill 862 in 2014, and the state transportation agency says it has awarded more than 11,500,000,000 dollars to 153 projects across 7 funding cycles statewide, aimed at cutting greenhouse gas emissions, vehicle miles traveled and congestion. At least 25% of that funding must benefit disadvantaged communities, and the state extended the cap and invest program that supports it through 2045.

A newer county count that never got restated

Reading the newer county release, from February 2026, rather than stopping at the 2024 announcement, turns up a count that was never restated later. Sonoma County Transit counted only 11 zero emission buses in its fixed route fleet at that point, and the county now projects that zero emission vehicles will reach a majority of its heavy duty buses only by 2028, 2 years past the date the 2026 percentage was built around. Neither release explains the other number, so this count and the 2026 projection are not added together here.

Emily Betts, transit service manager for Sonoma County Transit, described the strategy behind the newer buses.

By pairing fare-free local service with a growing zero-emission fleet, we're making it easier for riders to choose a sustainable way to travel around Sonoma County.

Emily Betts, transit service manager for Sonoma County Transit. Source 3.