TECHNO-ECONOMIC ANALYSIS OF PAPALANTO GAS TURBINE POWER STATION, OGUN STATE, NIGERIA

Abstract

ABSTRACT The persistent inadequacy of electricity supply in Nigeria has created the need to improve the operational efficiency and economic sustainability of gas turbine power plants. This study investigates the techno-economic performance of the Papalanto Gas Turbine Power Station (PGTPS), Ogun State, Nigeria, with emphasis on the effects of ambient temperature and compressor pressure ratio on turbine performance and electricity generation cost. Operational data collected between 2018 and 2020 were analyzed using the Brayton cycle thermodynamic model and regression analysis, while the economic feasibility was evaluated using the Levelized Cost of Electricity (LCOE) approach. The results showed that increasing ambient temperature from 296 K to 306 K reduced thermal efficiency from 0.1354 to 0.0938 and power output from 22.69 MW to 19.05 MW. Conversely, increasing the compressor pressure ratio from 7 to 13 improved thermal efficiency from 0.04 to 0.40 and increased power output from 22.5 MW to 42 MW. The estimated LCOE values were $0.0424/kWh, $0.0431/kWh, and $0.0436/kWh for 2018, 2019, and 2020 respectively, with variations mainly influenced by fuel cost and turbine performance. The study recommends the adoption of inlet air cooling systems, optimized compressor pressure ratios, and effective fuel management strategies to improve efficiency, reduce generation costs, and enhance sustainable electricity supply. Keywords: Gas turbine, Techno-economic analysis, Brayton cycle, Power generation, Ambient temperature, Levelized Cost of Electricity 1 INTRODUCTION