In investment arbitration, one of the most common methods for pricing the compensation owed to a successful claimant is discounted cash flow, or DCF. The method takes projections of a business’s future free cash flows and discounts them at a rate meant to express both the riskiness of the business and the time value of money, what a sum received years from now is worth in today’s terms. Because those future cash flows have not yet happened, they must be assumed. Some assets make that exercise simple: a bond that pays a fixed annual coupon for 10 years tells the valuer, in the instrument itself, exactly what the future free cash flows will be. Other assets make it far harder. The value of SpaceX shares depends on future free cash flows that are genuinely uncertain, which is why that value moves so much more than the price of a bond issued by a well-rated sovereign or company. A DCF, in other words, is only as good as the assumptions fed into it: the better the prospects for a business, the higher its present value, and the worse the prospects, the lower it falls.<\/p>\n
When a DCF is used to strike a commercial deal, the parties negotiate those assumptions directly. The seller argues the business will thrive; the buyer argues the seller is being optimistic; and the transaction closes, or it does not, on whatever premises both sides can live with. In investment arbitration, the dynamic is adversarial in a different sense: the claimant retains a valuation expert to persuade the tribunal that the expropriated or impaired business would have succeeded, and the respondent state retains its own expert to persuade the tribunal that it was headed for failure regardless of the measure complained of. In disputes touching the energy sector, and fossil fuels specifically, one assumption is increasingly at the centre of that fight: the energy transition itself<\/a>. When states face a fossil fuel investor in a dispute, they are beginning to argue, as a matter of course, that if an international tribunal uses an income-based method to determine compensation, it must take into account that the energy transition will affect that business negatively.<\/p>\n Two pending or recently terminated disputes under the ECT<\/span> show this argument in its most direct form because in both the measure complained of is itself a coal phase-out law.<\/p>\n In the Netherlands, RWE and Uniper sued over the Act prohibiting the use of coal for electricity generation, adopted in December 2019. RWE’s claim, valued by the Brattle Group<\/a> at approximately EUR 1.4 billion, treats the DCF method as uncontroversial: the claimants described it in their Memorial<\/a> as \u201cthe standard approach applied in the energy sector to determine the fair market value of power plants,\u201d particularly apt, they argued, because at the valuation date the Eemshaven plant’s \u201ctechnical characteristics … were well understood, as were its main revenue drivers.\u201d The dispute was never about methodology. It was about what world the model should assume. The Netherlands’ Counter-Memorial<\/a> went directly at the claimants’ premise (p. 363):<\/p>\n Claimants’ \u201cBut-For\u201d case assumes that Eemshaven would have been able to keep operating without any further restrictions until 2054. As such, Claimants ignore that the Coal Act was a means to achieve a goal: reduction of CO2 emissions. Also absent the Coal Act, Eemshaven would have eventually been forced to reduce CO2 emissions in accordance with this goal. … This would require Eemshaven to close or become CO2 neutral … Ignoring this need of CO2 reductions renders Claimants’ \u201cBut-For\u201d case implausible and inflates its damages estimate.<\/p>\n The dispute was never resolved on the merits. RWE and Uniper both discontinued their claims<\/a> in 2023 and 2024, for jurisdictional and political reasons unrelated to this argument, after the German Federal Court of Justice held<\/a> that the ECT’s arbitration clause cannot found a valid arbitration agreement between EU<\/span> parties.<\/p>\n In Germany, AET v. Germany<\/a> remains pending over the Act to Reduce and End Coal-Fired Power Generation of 2020, which closed the L\u00fcnen plant in which the claimant, a Swiss cantonal utility, held a 15.84% stake. Germany’s Counter-Memorial<\/a> makes essentially the same argument RWE faced, but frames the stakes more starkly, casting the claim as asking the tribunal \u201cto be the first investment treaty tribunal ever to order a State to pay damages for a legislative measure dedicated to climate action,\u201d and adding that:<\/p>\n Claimant’s claim must also be dismissed because the damages valuation of Claimant and its experts denies all scientific and treaty requirements of climate action. For example, Claimant’s entire valuation is built on the assumption that CO2 certificate prices would remain far below the amount needed to reach the goals under the Paris Agreement. An award based on such assumption would deny not only the Paris Agreement but the existential need to reduce CO2 emissions and mitigate climate change.<\/p>\n It is not surprising that a dispute over the value of a coal plant that is itself being phased out turns, centrally, on how the energy transition affects that plant’s present value. The claimant’s counterfactual and the state’s counterfactual diverge precisely because they disagree about how much of the transition to build into the model.<\/p>\n In January of this year, something different surfaced. The same argument, that the energy transition creates regulatory uncertainty and therefore added risk for businesses operating in industries being phased out, appeared in a case that does not arise from a phase-out measure at all. And a tribunal did not merely entertain the argument; it accepted to quantify a discrete discount to the claimant’s proposed damages figure on that basis, even though the underlying claim, unlike RWE<\/em> or AET<\/em>, had nothing to do with a phase-out law.<\/p>\n GreenX Metals Ltd, an Australian-listed company then trading as Prairie Mining Limited, held interests through British subsidiaries in two pre-production coking-coal projects in Poland: the Jan Karski and D\u0119bie\u0144sko mines. In April 2018, Poland’s Ministry of Environment refused to grant the Jan Karski mining licence<\/a>, despite GreenX having met the conditions to apply for it, and awarded the concession instead to LW Bogdanka SA, a state-owned coal producer. Poland did not stop mining that deposit; it simply excluded a foreign competitor from doing so, which is why GreenX announced the resulting award as a \u201cvictory against ‘resource nationalism in Poland,’\u201d not against climate policy.<\/p>\n The claims were brought in parallel arbitrations under the Australia\u2013Poland BIT<\/span> and the ECT. In its Final Award of October 7, 2024<\/a>, the ECT tribunal found Poland in breach and awarded the British investors GBP 157,612,158. Poland’s application to set that award aside was dismissed in full by the Singapore International Commercial Court (SICC) on January 9, 2026<\/a>, and because Poland’s challenge turned in part on the damages calculation, the SICC judgment reproduces the tribunal’s reasoning on quantum, the only public window into an otherwise confidential award.<\/p>\n That reasoning shows the tribunal applying a DCF built on the claimants’ valuation, modified by a series of adjustments proposed by Poland’s expert, Brattle Group. One of those adjustments is explicitly about the energy transition. The SICC judgment<\/a> quotes the tribunal’s own award: \u201cthe Tribunal considered the impact of new climate change policies on prices and agreed with Brattle that this represented a considerable uncertainty,\u201d and, building on that finding, \u201cthe Tribunal considers it reasonable to apply a discount of 5.47% (which represents approximately 75% of the price impact calculated by Brattle when applying the ‘Sustainable Development’ scenario) to the DCF value of the [Project] to reflect that risk.\u201d The tribunal did not adopt the full price impact of the IEA’s Sustainable Development Scenario, an accelerated, Paris-consistent pathway; it took roughly three-quarters of it, without a stated methodology for that fraction, and folded it into a broader 19.47% discount alongside four unrelated commercial adjustments.<\/p>\n The significance is not the size of the number. It is that a tribunal, in a dispute triggered by discriminatory conduct rather than climate regulation, still had to decide how much of the energy transition belonged in the counterfactual value of a coal asset, and chose to answer that question with a specific, calibrated discount rather than ignoring the issue or resolving it as all-or-nothing. Climate risk, once foreseeable enough to be priced, appears to follow the asset rather than the legal cause of action that brought the case to arbitration. If a tribunal will price that risk even where the claim has nothing to do with a phase-out measure, it is a safe prediction that transition risk will be pressed as a live variable in essentially every future damages phase touching a fossil fuel asset, regardless of what triggered the dispute.<\/p>\n Across these disputes, states have converged on three distinct kinds of arguments for why the energy transition should be priced into the valuation, and it is worth separating them because they rest on different premises and invite different rebuttals.<\/p>\n The first is a legal argument. States and commentators invoke systemic integration, the interpretative technique under Article 31(3)(c) of the VCLT<\/span><\/a> that reads a treaty alongside the other international obligations binding the parties, to argue that a state’s Paris Agreement commitments should inform how open-textured standards, and the valuation that follows a breach, are construed. On this view, a counterfactual that assumes the indefinite, unregulated operation of a coal asset assumes a state of affairs the law had already begun to exclude, and a tribunal that compensates an investor by capitalizing income that could no longer legitimately accrue risks an unjust enrichment<\/a>. The closest analogy is SPP v. Egypt<\/a>, where the tribunal declined to value a tourism project by reference to future land sales that had become illegal under international law once the site was registered as a UNESCO World Heritage property. The investor’s rejoinder is that the state remains bound to honour both bodies of law at once, to pursue the transition and to compensate the investors it harms in doing so, and that systemic integration is a canon of interpretation, not a licence to rewrite the standard of compensation.<\/p>\n The second is a factual argument, independent of whether the state is bound by any particular climate instrument. Financial economists describe \u201ccarbon-transition risk<\/a>\u201d as a real, measurable feature already embedded in market prices: cross-country evidence shows that higher-emitting assets carry higher expected returns and higher financing costs, particularly where domestic climate policy is stricter. On this view, a but-for valuation that freezes the energy transition at the valuation date is not measuring the asset’s fair market value at all; it is measuring the value the asset would have had in a world the market itself had already started pricing out. The GreenX<\/em> discount, tied to a named IEA scenario, is best read as an attempt, however unexplained in its mechanics, to give this factual argument a number.<\/p>\n The third is an argument from equity, and it applies most naturally where the dispute arises from a phase-out measure itself. Not every breach of international investment law need be compensated identically. A state found liable because it implemented a bona fide environmental measure disproportionately, for instance through a phase-out timeline too short to allow reasonable amortization of an investment, has arguably acted differently from a state that imposed a measure that was arbitrary or discriminatory by design. The law of state responsibility<\/a> leaves room, on this view, to ask whether the gravity and character of the state’s conduct may inform the assessment of compensation, without treating public purpose as erasing the breach altogether. Investors resist this framing on structural grounds: a state may pursue the most laudable end and still owe full compensation for what it destroys in pursuing it, and if equity requires spreading the cost of the transition across society, taxation, not a discount to one investor’s damages, is the tool suited to that task.<\/p>\n Which of these three routes, if any, a tribunal will follow is ultimately a question of the record before it. Tribunals will engage with the energy transition, or decline to, based on the evidence and the arguments each party places on file, not on a settled doctrine that dictates the outcome in advance.<\/p>\n Jos\u00e9 Ryb<\/strong> is an independent counsel and tribunal assistant in investment arbitration and complex commercial disputes.<\/p>\nWhere this argument has been made: The phase-out cases<\/strong><\/h2>\n
The surprise: A discount without a phase-out measure<\/strong><\/h2>\n
GreenX Metals v. Poland<\/strong><\/h2>\n
Three paths to the same argument<\/strong><\/h2>\n
\nAuthor<\/strong><\/h3>\n