Energy Audit follows ISO 50002 standard had been done on one of oil and gas industry in Kepulauan Seribu Indonesia. As part of the energy audit report, energy performance analysis on the power plant and measurement and verification (M&V) of the energy performance are presented in this paper. Learning curve methods had been employed to investigate both the power plant performance and the energy consumption base line for initiating M&V. Cumulative Sum (CUSUM) graphic was plotted to investigate the trend of energy saving/losses. Base on four years historical data it is discovered that the second- year data was the most suitable data for energy baseline. Statistical test was run on the second-year data to detect the parameter that influence the total energy consumption. It is revealed there are two factors that affecting total energy consumption of the oil and gas operation. They are gas production and produced water. The multiple coefficients of determination; R2 of the regression test of those variable is about 70%. The energy waste based on the energy equation baseline is about 12,434 GJ or 1.25% which is equivalent to US $ 35,242 assuming the gas prices is US $ 3/MMBtu.