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 United States Federal Transit Administration has released a report which reviews more than 20 hydrogen bus trials and demonstrations which operated worldwide between 2002 and 2007.  The trials were in the US, Europe, China, Japan and Australia.  Both internal combustion and fuel cell powered buses were trialled, as well as various fuelling and associated technologies. The resulting report analyses lessons learnt from the demonstrations, identifies key remaining challenges for introduction of the technology, and suggests potential roles for government in supporting commercialisation of fuel cell buses. The report can be downloaded here