'Only a matter of time' before developers start suing states over wind theft

With disputes running into hundreds of millions of dollars brewing over inter-farm wake losses, legal expert sets out three scenarios in which unhappy developers could turn fire on states

UK energy secretary Ed Miliband talks with Equinor CEO Anders Opedal at a recent energy security summit in London.
UK energy secretary Ed Miliband talks with Equinor CEO Anders Opedal at a recent energy security summit in London.Photo: Lauren Hurley / No 10 Downing Street

Orsted, Iberdrola and Equinor are among the developers which could eventually launch international legal claims against states over ‘wind theft’ disputes, with a legal expert saying it is “only a matter of time” before such claims arise.

A who’s who of offshore wind developers – including the aforementioned names – are currently embroiled in disputes over inter-farm wake losses between multi-billion dollar planned and existing projects in the North Sea.

These disputes, at least those widely known about, are currently playing out in UK planning proceedings – although the issue is by now a concern for most North Sea nations given the huge amount of planned capacity in the basin, with a regional target of 300GW by 2050.
In the UK, developers have warned that new planned projects could inflict huge financial losses on their existing assets, or those that have already won planning consent, with dire potential consequences.
Orsted, Equinor and SSE, for example, claim that the planned Dogger Bank South project – a 3GW array being developed by Germany’s RWE – could inflict losses of up to a staggering £964m ($1.3bn) on their nearby projects over their lifetimes.

The only realistic way to remedy losses of this scale is by ordering developers of newcomer projects – RWE, TotalEnergies and BP all sit in this camp in current UK disputes – to pay hefty compensation payments to incumbents.

But those developers have all fought tooth and nail against this proposal and the UK government at least looks minded to rule out compensation payments. So, if push came to shove, could aggrieved and out of pocket developers bring legal claims against states over wind theft?
“Given the large value of the possible damages from wind theft, I think it is only a matter of time before we see international law claims against states,” Ashique Rahman, an expert in public international law and international dispute resolution, told Recharge.

What legal avenue would a developer have for bringing such a claim? Potentially by invoking protections afforded to foreign investors under the web of bilateral and multilateral investment treaties signed between states.

Energy companies, most often in the oil and gas space, are big users of these treaties and frequently launch claims running into hundreds of millions or even billions of dollars against states they accuse of failing to protect their investments.

But renewables investors are not shy of bringing claims either. Spain, for example, has faced over 50 claims brought under investment treaties – most frequently the Energy Charter Treaty (ECT), to which there are dozens of state signatories – over its rolling back on subsidies for wind and solar farms in the wake of the 2008 financial crisis.
Claims brought against states against states in wake loss disputes could be heard by institutions such as the Permanent Court of Arbitration, which is based out of the Peace Palace in The Hague (pictured)Photo: Wikimedia Commons

Many European states are in the process of leaving the ECT but, for now, remain bound by its 'sunset clause' that protects existing investments for an additional 20 years after exit.

So a developer from, for example, Denmark (Orsted), Spain (Iberdrola) or Norway (Equinor), countries that are all signatories to the ECT, could bring claims against the UK government if they believe they have been treated unfairly. Britain’s SSE would not however be able to bring such a claim against the UK, given these treaties are in place to protect international investments.

Claims brought under these treates are heard not by judges but by international arbitration tribunals, typically composed of three lawyers. The cases are admistered by institutions such as the International Centre for Settlement of Investment Disputes, based in Washington, DC, or the Permanent Court of Arbitration in The Hague.

Rahman, who co-heads London-based legal boutique Saadeh Rahman and has represented investors and states in numerous high profile international disputes, believes there are at least three possible circumstances in wind theft disputes under which a foreign investor could bring a claim.

The first would be an investor such as Orsted or Equinor bringing a claim against the UK government if energy secretary Ed Miliband approved a wind farm – for example Dogger Bank South – that would do huge damage to the revenues of their own projects without requiring that any compensation be paid.

“The incumbent investor would probably argue, among other things, that it was not ‘fair and equitable’ for the State to approve a new farm which damages the already-in-place investment,” said Rahman. Investment treaties including the ECT routinely require states to provide “fair and equitable” treatment to investments.

The second ground, he said, could stem from a disagreement over the extent of the wake losses affecting a project. With numerous competing models for assessing wake losses all currently in use, warring developers and indeed the government could all disagree over the extent of wake losses and financial losses stemming from them.

In that scenario, Rahman said that the owner of an incumbent wind farm may argue that compensation awarded is too low and may launch an investment arbitration claim against a state for “undervaluing its loss.” The reverse could also be true if a developer felt it had been ordered to pay too much compensation.

A third ground could stem from a government denying permission to an investor to build a wind farm on the basis of potential wake losses. An aggrieved developer, for example RWE, could bring a claim under an investment treaty arguing that the decision was “unreasonable” or “unfair,” said Rahman.

“The argument would be that the government did not have legitimate reasons for denying permission or that it could have allowed the investment with measures in place to mitigate or pay compensation for loss.”

Orsted's Walney Extension wind farm in the Irish Sea, which modelling commissioned by the Danish developer shows could suffer badly from wind wakes generated by planned projects nearby.Photo: Orsted

Developers could use award against state as ‘leverage’ in future disputes

But would developers like Orsted or RWE be willing to risk launching a claim against a state – whether that be the UK or any other – and risk jeopardising their relationship with the government?

“The answer is likely to change from investor to investor and from state to state,” said Rahman.

An investor could be hesitant to bring a claim because it could prejudice future operations or investments in that state, he said, but “risk of future blowback is not likely to dissuade investors who have strong claims of substantial value.”

History is instructive. RWE, for example, launched an ECT claim against the Netherlands, where it has substantial investments, in 2021 over the state’s move to phase out the use of coal to generate electricity. US renewables giant NextEra and German utility E.ON both brought claims against Spain, a major market, over its subsidies cuts. Iberdrola has previously launched treaty claims against Guatemala over electricity tariffs.

There is also another factor at play, said Rahman. A developer may worry that if they do not explore “every available avenue of challenge,” both internationally and locally, “any offending measure by one state may be adopted by other countries.”

So Orsted might worry that if it does not take a strong line with the UK over approving a new wind project that could substantially hit the revenues of its own without requiring compensation be paid – what would stop the Netherlands, Germany or Belgium doing the same?

Any award by an international tribunal “could be influential in setting out what is and is not permissible” in this space from an international law perspective, said Rahman, and provide investors with “meaningful leverage” in future disputes.

Lessons to learn from oil and gas disputes?

The wind industry is not the first in the energy sector to find major players at loggerheads over who has rights to resources that are not easy to delineate.

Tomas Vail, another investment arbitration expert and founder of London legal boutique Vail Dispute Resolution, highlighted the “potential links between this phenomenon and two more established sources of disputes, one being around riparian water rights and the other around adjoining oil deposits.”

Supermajors have long clashed over migration of oil and gas between adjacent development blocks, while disputes over water rights over major rivers can cause geopolitical tensions – think Egypt and Ethiopia clashing over the Nile, or China and India over the Brahmaputra river.

However, although the “underlying tensions are familiar,” Vail noted that there have been “decades of disputes and decisions to help shape the law” in the oil and gas and hydro space. The same cannot of course be said for wind wakes.

And although water and oil are “difficult to track if underground,” agreements can be made on how to divide an oil reservoir,” he said. Wind, by contrast, “cannot obviously be owned in place,” complicating matters further.

One thing is certain, disputes over wake losses between offshore wind farms are taking developers into uncharted waters.

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Published 25 July 2025, 03:01Updated 25 July 2025, 11:47
OrstedEquinorIberdrolaRWEUK