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Key definition
TSO definition

What does TSO mean? In energy law and regulation, a transmission system operator (TSO) is the licensed entity that operates the high‑voltage electricity or high‑pressure gas transmission network, managing real‑time system security, balancing and non‑discriminatory third‑party access. The term is defined in EU electricity and gas legislation and is widely used in UK practice; in Great Britain the role stems from the Electricity Act 1989/Gas Act 1986, transmission or gas transporter licences and industry codes rather than a single statutory definition. Great Britain: National Grid Electricity System Operator Limited (ESO) is the electricity system operator for England & Wales and Scotland; transmission assets are...

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European Commission Article 102 TFEU Commitments: TenneT DK-DE Interconnector Guaranteed Minimum Cross-border Capacity and Monitoring (AT.40461, 7 December 2018)

Practice notes
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CASE HUB ARCHIVED

This archived case hub sets out the position as at the decision date of 7 December 2018; it is no longer maintained or updated. See further, timeline, commentary and related/relevant cases.

Case facts Outline

European Commission Article 102 TFEU inquiry into the electricity interconnector linking Western Denmark and Germany, operated by TenneT (case number AT.40461).

Latest development

On 7 December 2018, the Commission accepted commitments from TenneT under Article 9. These commitments, which will apply for nine years, provide that:

  • TenneT will offer to the market the maximum capacity consistent with the safe operation of the interconnector between Western Denmark and Germany and, in any case, will ensure a minimum hourly capacity of 1 300 megawatts on the interconnector (approximately 75% of its technical capacity); this minimum guaranteed hourly capacity will be achieved following an implementation...
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Web page updated on 22/05/2026

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