Buenger predicts that the cost of hydrogen stations will decline towards 300,000 euros, the price of a natural-gas pump, with each one installed—a process that is accelerating in Europe. Germany has 14 hydrogen stations open to the public, and a public-private collaboration announced early this year aims to roll out 36 more by 2015—enough to link most cities. Denmark laid out a comparable plan this spring. And on Friday, global chemicals producer Air Products announced plans to build two hydrogen filling stations in London, which would give the city a total of five.
