The 2015 ENTSO-E Cost-Benefit Analysis (CBA) Guideline establishes a harmonised methodology for evaluating electricity transmission and storage projects across Europe. Developed under EU Regulation 347/2013 and approved by the European Commission, it provides a consistent framework for assessing projects within the Ten-Year Network Development Plan (TYNDP). The methodology combines market and network modelling to quantify project impacts using common indicators, including socio-economic welfare, security of supply, integration of renewable energy, and reduction of CO₂ emissions. Both monetised and non-monetised indicators are applied to capture full system benefits. The guideline also requires scenario analysis and sensitivity testing to address uncertainties. It supports transparent comparison of projects and informs the selection of Projects of Common Interest, ensuring investments contribute effectively to market integration, sustainability, and reliability of the European energy system.
