Pacific Northwest National Laboratory (PNNL), in collaboration with government agencies and industries, is actively engaged in the development, testing, and characterization of high efficiency, low cost modular solid oxide fuel cell power generation systems for stationary, automotive and military applications. Advanced SOFC systems are being developed which will offer ease of operation on a variety of gaseous liquid hydrocarbon and coal-derived fuels as well as "zero emissions" capability. SOFC R&D activities at PNNL continue in the areas of cell component materials, electrochemistry, cell design and modeling, high temperature corrosion, and fuel processing. Specific activities include development of optimized materials and cost effective fabrication techniques for high power density anode-supported cells operating at temperatures below 800 degrees C, characterization of processes responsible for high electrical performance and long term performance degradation, optimization and cell and stack designs using computational engineering models, and hydrocarbon fuel processing using micro technology.