The energy transition presents a significant challenge for Indonesia, which currently ranks 42nd in the ASEAN Climate Change Index and has set a target of achieving Net Zero Emissions (NZE) by 2060. Hydrogen, as an alternative energy source, holds great potential to diversify fossil fuel usage, although further technological development is needed to reach an ideal Levelized Cost of Hydrogen (LCOH). This study employs a descriptive quantitative and regression analysis approach to calculate production costs, power consumption, and environmental impacts associated with utilizing excess hydrogen production from three out of four power generation units in West Java (UBP BSLA, UBP Cilegon, and UBP Kamojang). The findings indicate an annual reduction in hydrogen production costs of USD 0.303/kg H₂, with production patterns contributing to a 1.93% decrease in hydrogen generation costs (BPP H₂). Optimization of 22.6 tons of excess hydrogen production per year can generate additional revenue of IDR 1,222,911,546.37 annually through conversion to electricity and IDR 22,336,949,239.20 annually from compressed gas products. Hydrogen utilization also contributes to a reduction of up to 1,487,058.65 kg CO₂e per year via Hydrogen Refueling Stations and Hydrogen Generators, and supports 7% of the 21.53 million tons CO₂e Nationally Determined Contribution (NDC) target. Therefore, hydrogen plays a vital role as a carrier energy in supporting Indonesia's energy transition by reducing carbon emissions, enhancing energy independence, and fostering the development of a renewable energy-based hydrogen ecosystem.