The paper assesses the reliability performance of the 4.2 MW, Single Shaft Typhoon Gas Fired Turbine Power Generation Station at Beta Glass Plc (Guinea Plant), Agbara, Ogun State, Nigeria. The monthly outage data of the station for the period of 68 months (May, 2003 to December, 2008) were collected and used to compute the yearly reliability indices of the generating unit. The unit availability was found to be low, especially in 2007 and 2008. The station recorded highest number of fuel gas supply failure throughout this period. The core engine failures were frequent and repairs were not promptly effected which made the unit to operate below its rated capacity. The high forced outages recorded are indications of unreliable performance. Appropriate recommendations were proposed.