Hitachi Energy Supplies First Low‑Carbon Copper Transformer to TenneT Germany

Context TenneT Germany, the country’s largest transmission system operator, pledged a 30 % emissions cut by 2030. A 2023 framework agreement with Hitachi Energy calls for all new transformers to use low‑carbon copper, a material that reduces the carbon footprint of the device’s core conductors.

Key Facts - The transformer, rated at 380 megavolt‑ampere, was installed at the Hardebek substation in Hamburg. - Low‑carbon copper lowers embedded carbon emissions in transformer materials by 18 % compared with conventional copper. - Across the entire agreement, the material shift is projected to avoid 9,500 metric tons of CO₂ equivalent for TenneT. - Achieving the same reduction with wind power would require roughly 24 megawatts of capacity operating for a full year.

What It Means Replacing standard copper with low‑carbon variants trims the “cradle‑to‑gate” impact—emissions generated from mining through processing—by about 60 % according to TenneT’s environmental cost metric. For a grid operator, the biggest climate challenge lies in Scope 3 emissions, which stem from purchased capital goods like transformers. By decarbonizing the supply chain, TenneT can meet its net‑zero targets without compromising grid reliability.

The Hardebek unit, produced at Hitachi’s Bad Honnef plant, demonstrates that large‑scale power infrastructure can adopt greener materials without sacrificing performance. As more transformer orders move through the framework, the cumulative effect will amplify, potentially setting a new standard for European transmission networks.

Looking Ahead Watch for the rollout of additional low‑carbon copper transformers and the impact on TenneT’s 2030 emissions roadmap.