This summary document is Bonneville Power Administrations (BPA) latest projected Pacific Northwest Loads and Resources Study, commonly called the White Book. The 2004 White Book is a snapshot of the Pacific Northwest (PNW) region and the Federal system loads and resources as of December 31, 2004. The analysis incorporates BPAs estimates of PNW total regional retail loads, contract obligations, contract purchases, and resource capabilities. These estimates were provided by BP A and PNW Federal agencies, public agencies, cooperatives, U.S. Bureau of Reclamation (USER), and investor-owned utilities (IOUs) through 2004 Pacific Northwest Utilities Conference Committee (PNUCC) data submittals as well as direct submittals to BP A. These projections were compiled to estimate the load and resource capabilities for the 10-year study horizon, operating years (OY) 2006 through 2015, for both the PNW region and the Federal system. The White Book is used as input into BPAs long-range resource planning process, to assist planning for adequate and reliable load service for the Federal system and the region. This White Book includes possible scenarios of resource levels for both the Federal system and the region. The 2004 Pacific Northwest Loads and Resources Study is an update to the previous 2003 White Book.