CPP Investments and Elia Group acquire 1.8 GW Tarchon North Sea interconnector project from Copenhagen Infrastructure Partners for approximately C$1 billion
Canada Pension Plan Investment Board (CPP Investments) and Belgian transmission system operator Elia Group, through its international infrastructure platform WindGrid, have acquired the Tarchon subsea interconnector project from Copenhagen Infrastructure V, a fund managed by Copenhagen Infrastructure Partners (CIP). Tarchon is a planned 1.4 GW high-voltage direct current (HVDC) link, meaning electricity is transmitted as direct current rather than alternating current, which is more efficient over long distances. The approximately 760-kilometre cable network will run underground and subsea between East Anglia in the UK and Niederlangen in Germany, crossing Dutch territorial waters. It was approved by Ofgem, Great Britain's energy market regulator, in 2024. CPP Investments is providing a commitment of C$1 billion for a 75 percent majority stake in the project. Elia Group, through WindGrid, holds the remaining 25 percent structured as a minority participation. The project remains in an early development phase, with the earliest construction start in the UK set for 2030 and commercial operations targeted for 2034. Closing is expected by end-2026, subject to regulatory and closing conditions in the UK and Germany. The interconnector is described as a regulated asset, meaning its revenues will flow through a regulated framework rather than purely merchant market pricing. At full capacity, Tarchon is expected to supply up to 1.9 million households. The deal extends CPP Investments' existing infrastructure partnership with Elia Group and supports both countries' decarbonisation objectives by enabling cross-border renewable electricity flows.
Why this matters
The Tarchon transaction is a high-quality illustration of how regulated energy infrastructure attracts long-duration institutional capital: CPP Investments is committing C$1 billion to an asset with a 2034 commercial operations target, accepting development-phase risk in exchange for the predictable regulated return profile that HVDC interconnectors typically offer once operational. The Ofgem approval in 2024 was a critical legal milestone, and the project now requires further regulatory approvals in Germany and the UK as it progresses through its development phase, generating ongoing regulatory filing and grid connection agreement work. For energy and infrastructure lawyers, the deal also presents a complex ownership structure: a 75/25 joint venture between a Canadian pension fund and a Belgian regulated utility, with the WindGrid minority stake structured to remain limited in scale relative to Elia's overall balance sheet, requiring careful attention to shareholder agreement drafting, investment caps, and decision-making thresholds. The 2030-2034 timeline means that legal teams will be involved in this project for most of the decade.
On the Ground
A trainee on this matter would be coordinating regulatory filing submissions to Ofgem and German counterpart regulators as part of the approvals process, reviewing grid connection agreement terms and summarising licence conditions, and assisting with due diligence on the IP portfolio and existing development consents acquired from CIP.
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“What regulatory approvals would the Tarchon interconnector still require before construction can begin, and how does the regulated asset model affect the deal structure?”
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