# Terna Subsidiary Tamini Wins Landmark Contract for Three 400 kV Autotransformers to Reinforce Danish Power Grid

> Tamini Transformers, part of Italy's Terna Group, has been selected by Danish transmission system operator Energinet to supply three ultra-high-voltage 400 kV autotransformers. The units are engineered to balance growing offshore wind feed-in from the North Sea and enhance regional interconnectivity across Scandinavia and northern Europe.

- **Publish Date:** 2026-09-19
- **Category:** transmission-substations
- **Reading Time:** 5 min
- **Original Source Citation:** [Terna / Tamini Transformers Press Office](https://www.terna.it/en/media/press-releases/detail/tamini-contract-autotransformers-denmark-grid-september-2026)
- **Tags:** Autotransformer, Denmark, Energinet, Offshore Wind, 400 kV, Terna
- **Canonical URL:** https://voltformer.com/news/terna-tamini-contract-three-autotransformers-denmark-grid-september-2026
- **Markdown Source:** https://voltformer.com/news/terna-tamini-contract-three-autotransformers-denmark-grid-september-2026.md

## Expanding Scandinavian Transmission Resilience

Danish TSO Energinet selected Tamini following an extensive European tender focused on total lifecycle losses, acoustic performance, and high short-circuit withstand capabilities. Each 400 kV autotransformer will be installed at critical transmission nodes linking offshore wind landing points to Denmark's primary 400 kV backbone.

The units feature low-loss Grain-Oriented Electrical Steel (CRGO) cores with Step-Lap mitred joints, ensuring no-load loss reductions of more than 18% compared to legacy Danish substation assets.

## Stringent Acoustic and Environmental Specifications

Given the suburban proximity of Danish transmission substations, the autotransformers are equipped with multi-stage sound baffles and low-noise variable-speed cooling fans to keep acoustic noise below 58 dB(A) at 100% rated load.

Deliveries are scheduled to commence in early 2027, supporting Energinet's long-term energy transition targets.

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