The Baltic-Finland region is facing challenges related to energy security, environmental sustainability, and geopolitics due to its reliance on natural gas. The need to decarbonize the gas sector by 2050 is crucial, especially in the wake of conflicts affecting energy supplies. The study assessed four scenarios for decarbonization, highlighting the importance of transitioning to renewable gases like hydrogen and biomethane. By reducing natural gas dependency and embracing sustainable alternatives, the region can achieve net full decarbonization by 2050, aligning with EU sustainability goals. The Cost minimal scenario stands out for its cost-effectiveness and quick emission reduction, emphasizing the economic and environmental advantages of decarbonization. Investing in decarbonization not only mitigates climate change but also boosts economic growth and energy security. Policymakers play a key role in setting clear priorities to drive successful decarbonization, ensuring maximum societal benefits and risk mitigation. Overall, proactive measures and strategic decision-making are essential for a smooth transition towards a sustainable and decarbonized gas sector in the Baltic-Finland region.