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Niigata Power Systems Co., has developed new gas turbine NGT3B which installed in a large standby generator set. This gas turbine engine meets a large capacity of important facilities in japa metropolitan areas. It is installed in CNT-3000EA generator set which generates 3,000 kVA. Furthermore, it is scaled up to 6,000 kVA by using twin NGT3B gas turbine. Although the generator set is large, it can be quickly started within 40 seconds defined by the fire defense law in Japan. An additional specification of rapid restarting within 40 seconds after engine stop increases reliability for a standby generator set. The other features are lightness, a digital control, a remote monitoring system and a low leakage lubricating system. The gas turbine engine is composed of a single shaft, two-stage centrifugal compressor, threestage axial turbine, a single can combustor, and a dual fuel injector. One characteristic is turning-less for rotor cooling after the engine stops. Characteristic positions of rotor bearings realize it. The rated output power is increased from 2207 kW to 2648 kW by the improvement of NGT3A base model. A thermal efficiency achieves 24.7%. On the other hands, the maximum power is 2800 kW, so some margin is given to the rated output power. Durability against the heat cycle by the fast start is tested by repeated engine starts and stops. And rapid restarting tests within 40 seconds are done on the assumption that power grids are returned during the engine stops. Long no load continuous running tests improve reliabilities of early standby to blackout. Over load tests confirm the durability of hot parts. There is no problem for durability of the engine. Any remarkable decrease in performance can be detected in the durability tests. This paper describes the design features of major engine component and a generator set for NGT3B. An engine performance and durability tests results are also shown.