**4.1 Experimental**

172 Renewable Energy – Trends and Applications

Fig. 6. Flow diagram of 200 kW-class SOFC-micro gas turbine combined system developed

Large scale SOFC systems are being developed aiming for a distributed electrical power plant with high energy conversion efficiency. Mitsubishi Heavy Industries (JP) has developed a 200 kW class micro gas turbine hybrid system as shown in Fig. 6 with a maximum efficiency of 52.1% LHV, and a maximum gross power of 229 kW-AC was achieved with natural gas as a fuel. Their final goal is to achieve electrical efficiency of 70% by developing large-scale power generation system in which the SOFC integrates with gas turbines and steam turbines (Yoshida et al., 2011). Rolls-Royce Fuel Cell Systems (GB) is designing a stationary 1 MW SOFC power generation system based on their segmented-inseries cell stack named Integrated-Planar SOFC technology (Haberman et al., 2011; Gardner et al., 2000). FuelCell Energy (US) is developing SOFC power plants, currently utilizing SOFC stacks developed by Versa Power Systems (CA). Their ultimate goal is to develop Multi-MW SOFC power plants suitable for integration with coal gasifiers and capable of

by Mitsubishi Heavy Industries (Yoshida et al., 2011).

capturing > 90% of carbon in coal syngas (Huang et al., 2011).

demonstrative research project in Japan (Hosoi et al., 2011).

Fig. 7. Appearances of installation sites of residential SOFC CHP systems under
