Climate change threats demand unprecedented economic shifts around the world, including a fundamental transformation of the global energy system. An energy transition is underway in most regions, predominantly in the power sector. This research depicts the energy transition pathway for achieving 100% renewable energy systems through bioenergy in Pakistan. The growth rate of 20%, 30%, and 40% in biomass projects were considered for the study period 2023 to 2053 using the Low Emissions Analysis Platform (LEAP) software. It presents a technology-rich, multi-sectoral and cost-optimal energy transition pathway for limiting global mean temperature below 1.5 C. The results revealed that Pakistan's electricity generation undergoes a rapidly evolving transition from predominantly fossil fuels 62.1% in 2023 to 81.3% renewables in 2053, and entirely zero CO 2 emissions by 2060. Hydro source is costly, wind and solar sources are seasonal so biomass emerges as the major electricity supply source in a cost optimal energy transition of Pakistan. Share of biomass is increasing from a mere 0.81% in 2023 to around 9.44% by 2053 under the 20% growth rate, which then increase to 39.67% by 2053 under the 30% growth rate and further increases to 78.33% by 2053 under the 40% growth rate. Pakistan contributes 0.8% of the global carbon footprint, but we are among the 10 most climate-stressed countries on the planet in 2023 so this study helps to reduce cumulative CO 2 emissions from 151.63 million metric tons to 8.90 million metric tons from 2023 to 2053 across the power, heat, transport, and desalination sectors. K E Y W O R D S biomass, CO 2 emissions, energy policy, environmental planning, waste management 1 | INTRODUCTION The Paris Agreement (PA) was agreed on December 2015 during the United Nations Framework Convention on Climate Change's (UNFCCC), 21st Conference of Parties (COP21). 1 It went into effect on November 4, 2016, and superseded the Kyoto Protocol, a previous international pact to reduce CO 2 emissions. 2 Its principal goal is to strengthen the mechanisms in place to tackle climate change by keeping the global average temperature rise much below 1.5 C over preindustrial levels. 3 For this purpose, the PA was signed by 195 countries, to reduce carbon emissions and put together a joint effort for preventing global warming. 4 Of these 195 countries, 17 are of the Commonwealth of Independent States (CIS) and South-Eastern Europe. 4 These countries are of particular interest as their transition