Grand Canyon Hydrogen-Powered Motorboat Demonstration Act of 2004

Grand Canyon Hydrogen-Powered Motorboat Demonstration Act of 2004 - Directs the the Secretary of Energy and the Secretary of the Interior to implement jointly a research and development program, in partnership with the private sector, regarding hydrogen-based motorboat propulsion technologies suitable for operations in sensitive resource areas such as national parks, including a demonstration of hydrogen-based motorboat propulsion technology at Grand Canyon National Park.

Authorizes the Secretary of Energy to extend existing Department of Energy hydrogen-related vehicle research and development programs in order to meet the objectives of research, development, and demonstration of a hydrogen-based alternative motorboat propulsion system suitable for recreational whitewater river operations on the Colorado River within Grand Canyon National Park.