The Department of Energy has initiated this program to advance phosphoric acid electric utility cell stack technology and to reduce cell stack cost. The cell stack has a nominal 10-ft/sup 2/ active area and operates at 120 psia405/degree/F. The program comprises six parallel phases, which culminate in a full-height, 10-ft/sup 2/ stack verification test. The only active technical task under this program is Phase VI, Task 5---Operational Testing. The objective of this task is to conduct additional testing of the full-height 10-ft/sup 2/ stack with a goal of reaching 3500 hours.