<![CDATA[As Indonesia's population grows, the need for electrical energy increases. To meet this demand, the government is required to build power plants, one of which is a Steam Power Plant (PLTUs). However, PLTUs still rely on coal as their primary fuel, which contributes significantly to carbon emissions. One effort to reduce these emissions is the implementation of biomass cofiring technology as a more environmentally friendly alternative energy source. This study aims to model the thermal system of the Anggrek 2×25 MW PLTUs using Cycle Tempo 5.0 software and evaluate the system performance at varying cofiring ratios of coal with lamtoro biomass, specifically 10%, 15%, 20%, 25%, and 30%. The research method employed a cycle tempo simulation, utilizing input parameters derived from the actual operational data of the Anggrek PLTUs. The system model built was used to compare the performance of the PLTUs under existing conditions with various fuel mixture variations. The simulation results showed that the addition of lamtoro biomass to the fuel mixture reduced the efficiency of the thermal system due to the lower heating value of biomass compared to coal. The results based on existing conditions of 100% coal provided the highest efficiency, namely gross power of 23.23% and net power of 22.23%. At the same time, the 10% cofiring variation achieved a gross power efficiency of 21.98% and a net power of 21.02%. Meanwhile, a 15% variation yielded a gross power of 21.32% and a net power of 20.37%. Furthermore, a 20% variation yielded a gross power of 21.00% and a net power of 20.03%. A 25% variation yielded a gross power of 20.56% and a net power of 19.61%. Finally, a 30% variation yielded a gross power of 20.31% and a net power of 19.36%. Thus, this study demonstrates that cofiring lamtoro biomass can be a strategy to reduce dependence on coal and reduce carbon emissions, although system efficiency tends to decrease.]]>
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