Hydrogen Fuel Cell Act of 2003

Directs the Secretary to establish a cooperative agreements program with the private sector to demonstrate fuel cell-powered buses, trucks, and other heavy duty vehicles.

Instructs the Secretary, in cooperation with Indian Tribes, to develop and transmit to Congress a commercial application strategy for development of hybrid distributed power systems on tribal lands.

Mandates a Federal purchase and procurement program for fuel cell vehicles, including an agency fleet transition plan for vehicles powered by fuel cell technology.

Instructs the Secretary to establish and fund a stationary fuel cell power purchase program for federally-owned or -operated facilities, Federal residences, and Federal portable applications.

Amends the Public Utility Regulatory Policies Act of 1978 to establish Federal standards governing: (1) distributed generation; (2) distribution interconnections; (3) minimum fuel and technology diversity; (4) prohibited rates and charges; and (5) net metering.

Amends the Internal Revenue Code of 1986 to allow as a credit against tax: (1) a qualified hydrogen fuel cell motor vehicle credit; (2) 50 percent of the amount paid or incurred for the installation of hydrogen fuel cell motor vehicle refueling property; and (3) 30 percent of residential fuel cell property expenditures.

Directs the Secretary to transmit to Congress a plan identifying critical technologies, enabling strategies and applications, technical targets, and associated time frames that support the commercialization of hydrogen-fueled fuel cell vehicles.