The Thailand Greenhouse Gas Emission Inventory System (TGEIS) is a comprehensive platform designed to support the country’s efforts in monitoring, reporting, and verifying greenhouse gas (GHG) emissions. Developed to align with international reporting obligations under the Paris Agreement, TGEIS facilitates the compilation and management of GHG data across multiple sectors, including energy, industrial processes, agriculture, forestry, and waste. It ensures data transparency, consistency, and accuracy by integrating advanced methodologies and user-friendly interfaces for data entry and analysis. TGEIS plays a critical role in enabling Thailand to track progress toward its climate targets and enhance its Biennial Transparency Report (BTR) submissions.