We recently supported Network Rail in securing a five-year renewable energy supply agreement, marking a significant milestone in corporate decarbonisation and the evolution of power purchase agreements (PPAs) in the UK.
Acting as technical advisor, we worked closely with Network Rail throughout a regulated tender process designed to identify a suitable renewable energy project capable of delivering a reliable, medium-term electricity supply. The scope of our work included providing input into the tender design and undertaking detailed technical evaluations of multiple bidders.
Working alongside other specialist advisors responsible for commercial and legal assessments, our independent technical due diligence played a key role in informing Network Rail’s final decision. Following a comprehensive evaluation process, RWE was selected as the preferred supplier.
Under the agreement, renewable electricity will be supplied from the Gwynt y Môr offshore wind project, providing around 300 GWh of power annually. This will meet approximately 65% of Network Rail’s non-traction electricity demand, supporting a wide range of assets across its estate, including offices, depots and its managed stations.
Our assessment focused on critical project delivery risks and performance considerations, including the technical capability and track record of bidders, the likelihood of projects being delivered within stated timelines, and the robustness of projected energy generation. This ensured that Network Rail could proceed with confidence that its chosen partner will meet its operational and decarbonisation objectives.
Neil Marshall, Advisory Lead for Onshore Wind at Natural Power, said: “As more corporates turn to PPAs to meet sustainability targets and manage energy costs, the need for robust technical oversight is becoming increasingly clear. Selecting a renewable energy partner is not solely a commercial decision, it requires a deep understanding of project feasibility, delivery risk, and long-term performance.
“Without appropriate technical scrutiny, corporate buyers face a range of potential risks, including project delays, underperformance in energy generation, and failure to meet decarbonisation commitments. In some cases, poorly managed projects may also introduce reputational challenges, particularly where environmental, consenting, or construction practices fall short of expectations. Natural Power is well-positioned to support organisations across sectors in navigating this increasingly complex landscape.”
Our work with Network Rail demonstrates the value of integrating independent technical expertise into the procurement process. By identifying and mitigating risks early, corporate buyers can avoid costly delays, repeated procurement exercises, and missed sustainability targets.
The successful outcome of this project highlights a growing opportunity for corporate energy buyers to adopt a more rigorous, risk-informed approach to renewable energy procurement. By providing targeted technical advisory services - often representing a relatively small proportion of overall transaction costs - Natural Power enables clients to make informed decisions and secure reliable, high-quality renewable energy supply.