Many SOFCs are still in development.
In 1997, under contract with the Defense Advanced Research Projects Agency (DARPA) and the Army Research Office, McDermott completed a successful 300-hour demonstration of a proprietary, 50-kW, JP-8 fuel processor integrated with a planar, solid-oxide fuel cell. Our fuel processor achieved greater than 70% conversion efficiency, closely matching the maximum theoretical efficiency for that operating condition. The same system was demonstrated with high conversion efficiency using sulfur-laden naval distillate (NATO F-76), gasoline, and natural gas.In April 2000, the U.S. Department of Energy announced that a SOFC-microturbine cogeneration unit will be evaluated by the National Fuel Cell Research Center and Southern California Edison. The fuel cell was built by Siemens Westinghouse and the microturbine by Northern Research and Engineering Corporation. In a year of actual operating conditions, the 220 kw SOFC will run on natural gas and (hopefully) achieve an efficiency of 55 percent. Partners in a technology development program, DOE and Siemens Westinghouse hope to place a 1 mw fuel cell cogeneration plant in operation in 2002.
The only operational SOFC operated from 1999 to 2001 in the Netherlands. here is a quote, or you could just go to where I found it yourself.
The performance of the 100kW system has been extraordinary, and we are very pleased with the operation of the rebuilt module," said Ray George, Department Manager for Operations for Siemens Westinghouse�s Stationary Fuel Cell group. "I believe the fact that there has been no performance degradation over such a long period of operation is unique among all types of fuel cells."
At the point of shutdown the unit was providing 110kWe into the local grid with an electrical efficiency of over 46%. It was also providing 65kWth as hot water into the district heating system. The emissions from the system were especially impressive with NOx, SOx, CO, and VHCs all measured below 1ppm. The unit normally operated unattended with a one day per week site visit by technicians employed by the local utility, NUON, which operated the system for the EDB/ELSAM consortium.
exact specs of the system can be found here.
and the company that makes them talks about them here