||The ETI commissioned Frontier Economics to develop a robust framework for comparing the costs and benefits of electricity generation, storage and interconnection investments in Great Britain (GB), and to produce transparent decision support tools that facilitate balanced and evidence-based value for money assessments. This project report develops and applies a framework for assessing value for money that can be applied by policy makers and other interested parties. The framework is designed to assess potential investment decisions in 2025 within the context of GB electricity system transition to meet carbon budgets. The project report sits alongside two transparent Excel-based tools, which can be used to apply the framework. The principles of the framework are capable of being adapted by any user, adopting their own underlying assumptions about technology costs or baseline system.