100% renewable targets will require power storage to manage flows on the net
Electrolysers utilise these intermittent power flows to produce H2 gas from water
H2 gas can be stored in large quantities underground and transported via existing gas pipelines
H2 vehicles recharge faster and are more durable than battery powered transport
Growing H2 demand in industrial processes will reduce costs and increase supply

The California Fuel Cell Partnership has published “A California Roadmap: Bringing Hydrogen Fuel Cell Vehicles to the Golden State,” a report that describes the infrastructure necessary to successfully launch commercial fuel cell electric vehicles (FCEV). The report was put together by stakeholders from industry, academia, non-governmental organisations and government aiming to outline the necessary steps for the vehicle and infrastructure market as it progresses through pre-commercial (2012-2014) and early commercialisation (2015-2017).
The roadmap identifies 68 station locations throughout the state that will serve the first 20,000 FCEV customers with enough hydrogen. Enough stations will give them the confidence that they can choose a FCEV instead of a conventional gasoline vehicle.  The total cost to expand to 68 stations, and provide operations and maintenance support until the stations become profitable is estimated at $65 million.

It also incorporates market-based assessments, models, and tools as well as professional experience with launching advanced vehicles and new infrastructure.

More information is available here.