California orders world's largest hydrogen bus station: 175 buses, 3.5 tonnes H2 per day

San Mateo County Transit District, better known as SamTrans, has contracted FASTECH and Bosch Rexroth to build what both companies say will be the world's largest hydrogen refuelling station designed specifically for transit bus fleets. The facility will serve up to 175 fuel cell electric buses, dispensing up to 3.5 tonnes of hydrogen per day through four simultaneous dispensers.

Debut for Bosch Rexroth CryoPump

The station will feature the first commercial deployment of Bosch Rexroth's CryoPump, a liquid hydrogen pumping system unveiled at Hannover Messe in 2024 and developed in partnership with FirstElement Fuel, the largest commercial hydrogen station operator in the US. The system uses a two-stage electro-hydraulic pump that handles both liquid and gaseous hydrogen, eliminating the buffer gas storage tanks and complex valve manifolding that have historically driven up the cost and physical footprint of large-scale stations.

The specifications are striking: efficiency above 95 per cent, maintenance intervals exceeding 4,000 hours (roughly four times the conventional benchmark for crankshaft-based pumps), throughput of 1,200 kilograms of hydrogen per hour, and a footprint of less than 11 square metres. Bosch Rexroth claims the technology cuts station operating costs by up to 70 per cent. Crucially, the system virtually eliminates hydrogen losses from boil-off and venting during liquid-to-compressed transfer — a persistent source of waste at cryogenic stations.

108 fuel cell buses already on order

In October 2024, SamTrans placed the largest single fuel cell bus order in manufacturer New Flyer's history: 108 Xcelsior CHARGE FC 40-foot buses valued at up to $168.25 million. The first ten entered service in early 2025, with the remainder arriving in phases through early 2027. The buses achieve a daily range of approximately 300 miles (480 km), compared with around 200 miles (320 km) for battery-electric alternatives — a gap SamTrans has cited as a deciding factor given the topography and route lengths across San Mateo County.

Second station in quick succession

The FASTECH contract is SamTrans' second major hydrogen station project in recent months. In mid-2025, the agency awarded Trillium a $17.4 million contract for a permanent hydrogen station at its North Base Facility in South San Francisco, expected to be operational by summer 2027. SamTrans has been fuelling its initial hydrogen buses from an interim setup that lacks the capacity for the fleet now on order.

ARCHES and California hydrogen policy

The infrastructure buildout is backed in part by $34.5 million from ARCHES, the Alliance for Renewable Clean Hydrogen Energy Systems — California's regional hydrogen hub and the first of seven nationwide hubs to sign its agreement with the US Department of Energy. The broader ARCHES programme totals $12.6 billion, comprising up to $1.2 billion in federal funding and $11.4 billion in public and private matching investment.

SamTrans serves more than 10 million riders annually across 74 fixed bus routes. The agency aims to eliminate diesel entirely by 2034 — six years ahead of the legal requirement. The California Air Resources Board's Innovative Clean Transit mandate requires all transit agencies in the state to operate fully zero-emission fleets by 2040.

Why this matters

The scale of the SamTrans project demonstrates that hydrogen in public transport has moved beyond the demonstration phase. A fleet of 175 buses with a dedicated 3.5-tonne-per-day station is no longer a pilot but operational reality. The deployment of new compression technology (CryoPump) that dramatically reduces cost and footprint strengthens the business case for future projects — including in Europe, where cities face comparable scaling challenges.

Sources

• Hymotive, 12 June 2026 — California orders world's largest hydrogen bus station for 175-vehicle fleet
• Sustainable Bus, 12 June 2026 — FASTECH and Bosch Rexroth to deliver hydrogen station for SamTrans
• Electrive, 12 June 2026 — SamTrans orders major hydrogen bus refuelling hub
• Gasworld, June 2026 — World's largest hydrogen bus station announced in California
• New Flyer / NFI Group, 21 October 2024 — Largest hydrogen fuel cell-electric contract in company history
• SamTrans, December 2024 — SamTrans leads the charge with hydrogen fuel cell electric buses