S.3531: A bill to amend the Internal Revenue Code of 1986 to increase, expand, and extend the credit for hydrogen-related alternative fuel vehicle refueling property and to increase the investment credit for more efficient fuel cells.

Amends the Internal Revenue Code, with respect to the tax credit for alternative fuel vehicle refueling property expenditures, to: (1) increase the rate of such credit from 30% to 50% for hydrogen-related alternative fuel vehicles, (2) eliminate the dollar limitation on such credit for hydrogen-related vehicles, (3) allow such credit for off-highway motor vehicles designed for carrying or towing loads, and (4) extend such credit through 2016...

(Source: Library of Congress)