# Statnett and Svenska kraftnät Energize 1,000 MVA 420 kV Phase-Shifting Transformer at Hasle Substation

> To resolve structural power loop flows between southern Norway and western Sweden, transmission system operators Statnett and Svenska kraftnät have energized a 1,000 MVA 420 kV Phase-Shifting Transformer (PST) at Hasle Substation near the national border.

- **Publish Date:** 2026-09-21
- **Category:** transformers-grid
- **Reading Time:** 4 min
- **Original Source Citation:** [Statnett & Svenska kraftnät Nordic Operations](https://www.statnett.no/en/about-statnett/news-and-media/news-archive/hasle-420kv-phase-shifting-transformer-energization-september-2026/)
- **Tags:** Statnett, Svenska kraftnät, 420 kV, Phase Shifting Transformers, Nordic Grid, Interconnectors, Transformers
- **Canonical URL:** https://voltformer.com/news/statnett-svenska-kraftnat-commission-hasle-420kv-phase-shifting-transformer
- **Markdown Source:** https://voltformer.com/news/statnett-svenska-kraftnat-commission-hasle-420kv-phase-shifting-transformer.md

## Eliminating Loop Flows Across the Nordic Synchronous Area

Massive wind generation buildouts in northern Sweden often route unscheduled transit electricity southward through Norway’s hydro-rich grid, creating bottlenecks that restrict cross-border trading capacity. The new Hasle PST actively controls power flow across the 420 kV cross-border tie-line.

With a rated throughput of 1,000 MVA, the unit utilizes dual-tank design separating the shunt and series active parts, allowing precise phase angle adjustment up to ±25 degrees without exceeding transformer core flux density limits.

## Unlocking 500 MW of Additional Cross-Border Commercial Capacity

By steering power directly along contracted contractual paths, Nordic TSOs can safely expand cross-border capacity between price bidding zones NO1 (Oslo) and SE3 (Stockholm) by 500 MW.

The transformer is equipped with online dissolved gas chromatography, optical fiber hot-spot temperature probes, and biodegradable synthetic ester insulating liquid to satisfy stringent environmental protection standards in the surrounding forest catchment basin.

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