<![CDATA[Perspective of Islamic education as based on data released by the Ministry of Energy and Mineral Resources, Indonesia has an estimated geothermal potential of 27,000 MW spread across 256 locations [Suyanto]. The number of states Indonesia is an area which has reserves of geothermal energy 40% of the world's total geothermal reserves. PT PLN (Persero) PLTP Ulubelu is the largest geothermal plant in Lampung with capacity of Unit 1 and Unit 2 of 110 MW. In this research, analysis of the performance of the steam turbine mengenahi geothermal power plants and analysis of the influence of the turbine inlet temperature and pressure as well as vacuum pressure in the condenser at Ulubelu PLTP Unit 1. Based on average yield calculation analysis indicating that the actual turbine power of 49 736 kW, ideal turbine power amounting to 56617.46 kW, amounting to 48741.28 kW power generator, isentropis efficiency of 87.85%, the specific steam consumption (steam turbine rate) 6.6712591 kg / kWh, turbine heat rate 18443.66 kJ / kWh and thermal efficiency by 19 , 53%. Turbine performance is influenced by temperature, inlet pressure turbine and condenser vacuum pressure, evidenced from the results of the analysis in which the inlet temperature of 165.5 ° C 6.9543 bar inlet pressure and pressure-a vacuum condenser br 0,074-a is able to produce the actual power 50100 kW, power 55341.1516 ideal kW, ƞs = 90.5293%, the specific steam consumption of 6.44 kg / kWh, turbine heat rate 17781.03 kJ / kWh and ƞth = 20.24%.]]>
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