Mark W Friedman, Dietmar W Prager and Ina C Popova, Debevoise & Plimpton

This is an extract from the third edition of GAR’s The Guide to Energy Arbitrations. The whole publication is available here.

Expropriation claims have been a perennial feature in energy disputes since the 1970s. At that time, the nationalisation of US oil companies by a newly installed Gaddafi regime gave rise to early energy cases such as TOPCO v. Libya and Libya American Oil Company (LIAMCO) v. Libya. Over the years, we have seen developments in the mechanisms for resolving energy disputes, such as the rise of investor–state arbitrations and the adoption of the Energy Charter Treaty (ECT) in 1994, but the nature of energy disputes remains fundamentally the same. It is no wonder that this is the case given the cyclical nature of energy markets. In times of rising prices, energy resources represent easy opportunities to capitalise on the upward trend for investors and governments alike.

In addition, investments in the energy sector differ from other sectors. States perceive energy resources as central to economic policy and intimately tied to national sovereignty, frequently making energy policy a high political priority. At the same time, investors in this sector commit substantial financial resources in the hope of returning profits in the long term, despite the risks associated with the venture and the volatile markets. When a dispute arises over an energy investment, therefore, both investors and states stand to make significant gains or incur significant losses depending on the outcome.

Energy disputes, particularly those involving expropriation claims, have thus often prompted the development of international law. As of 30 June 2018, 41 per cent of cases administered by ICSID arose from the energy sector, more than any other sector. Indeed, energy disputes involving expropriation claims have led to some of the largest damages awards ever issued in investor–state arbitration, including Yukos v. Russian Federation (approximately US$50 billion) and Occidental v. Ecuador (approximately US$1.1 billion).

Overview of expropriation

At its essence, an expropriation is the taking of private property by a government acting in its sovereign capacity. Nationalisation, a form of expropriation, generally covers an entire industry or geographic region. Nationalisations typically occur in the context of a major social, political or economic change. While international law recognises that states have the right to nationalise or expropriate, that right is subject to certain conditions under customary international law and investment treaties. These conditions have led to a distinction between 'lawful' and 'unlawful' expropriations, which can have consequences for the standard by which damages for the expropriation are assessed.

As reflected in the TOPCO v. Libya case, under customary international law a 'lawful' expropriation must be, at a minimum, for a public purpose, non-discriminatory and accompanied by appropriate or fair compensation. Investment treaties recognise a similar standard and generally include the further requirement that expropriation be conducted according to due process of law.

Expropriation can be direct or indirect. A direct expropriation typically occurs when the state directly transfers legal title to the asset to the state, such as through nationalisation. Today, however, nationalisations have become infrequent. Expropriation claims more frequently involve 'indirect' expropriation (i.e., a taking through measures tantamount to expropriation). Most investment treaties explicitly address indirect expropriation as well as direct expropriation. For example, Article IV(1) of the US–Argentina bilateral investment treaty (BIT) provides that 'Investments shall not be expropriated or nationalized either directly or indirectly through measures tantamount to expropriation or nationalization'.

In evaluating a claim of indirect expropriation, the central question is whether the investor has been substantially deprived of the value of the investment, even if not of the entire legal interest. Determination of indirect expropriation is thus necessarily highly fact-specific. Not every state measure reducing the value of an investment will amount to an expropriation. Two recently concluded trade agreements, the proposed United States-Mexico-Canada Agreement (USMCA) and the Comprehensive and Progressive Agreement for Trans-Pacific Partnership (CPTPP), expressly recognise the fact-specific nature of indirect expropriation and the need to establish more than just an adverse economic effect on the economic value of an investment. In fact, the proposed USMCA goes further by providing specific factors to be considered in the determination of whether certain measures constitute indirect expropriation.

Tribunals have often looked to whether the alleged indirect expropriation affected ownership rights. In Sempra v. Argentina, the ICSID tribunal gave the following examples of measures that would give rise to a substantial deprivation:

depriving the investor of control over the investment, managing the day-to-day operations of the company, arresting and detaining company officials or employees, supervising the work of officials, interfering in administration, impeding the distribution of dividends, interfering in the appointment of officials or managers, or depriving the company of its property or control in whole or in part.

Similarly, in applying the substantial deprivation test, the ICSID tribunal in CMS Gas v. Argentina considered whether the interference at issue deprived the investor of reasonably expected economic benefits, affected the 'fundamental rights of ownership', or prevented 'the realization of a reasonable return on investments'.

Tribunals addressing indirect expropriation under the ECT have looked to similar considerations. In Plama v. Bulgaria, applying the ECT to the alleged indirect expropriation of an investment in a Bulgarian oil refinery, an ICSID tribunal considered the following:

(i) substantially complete deprivation of the economic use and enjoyment of the rights to the investment, or of identifiable, distinct parts thereof (i.e., approaching total impairment); (ii) the irreversibility and permanence of the contested measures (i.e., not ephemeral or temporary); and (iii) the extent of the loss of economic value experienced by the investor.

In AES v. Hungary, the tribunal considered a claim of indirect expropriation based on a series of price regulations issued by Hungary in response to public outrage over high profits in the public utility industry. The tribunal explained that:

[A] state's act that has a negative effect on an investment cannot automatically be considered an expropriation. For an expropriation to occur, it is necessary for the investor to be deprived, in whole or significant part, of the property in or effective control of its investment: or for its investment to be deprived, in whole or significant part, of its value.

The tribunal dismissed the claim for expropriation in that case, noting that the investors 'retained at all times the control' of the public utility plant and 'continued to receive substantial revenues from their investments'. The ICSID tribunal in Mamidoil v. Albania also concluded that indirect expropriation requires not only a showing that 'the investment lost value and the investor was deprived of benefits, but also that these effects resulted from a loss of one or several attributes of ownership'. Several tribunals in the ongoing spate of renewable energy arbitrations against Spain also adopted a similar approach to claims of indirect expropriation arising out of regulations implemented by Spain to wind back and eliminate a special regime of subsidies granted to investors in the renewable energy sector. In Charanne v. Spain, the majority of the tribunal concluded that there was no indirect expropriation because the claimants' company was still operating and making profit, and retained possession of its property and assets. Similarly, the tribunal in Novenergia v. Spain observed that the claimant remained the 'untouched' owner of its industrial properties and holder of the companies' shares and relevant capital, which did not support a 'taking' by Spain.

Circumstances giving rise to claims of expropriation in the energy sector

In the energy sector expropriations generally fall into three categories: nationalisations; regulatory or fiscal measures tantamount to a taking; and cancellation of contractual rights. This section considers how some of these issues have been addressed by various international arbitration tribunals.


Outright nationalisations are increasingly rare. When they do occur, the legal implications are sufficiently well settled that the question of the existence of an expropriation is generally not in dispute. For example, in Guaracachi and Rurelec v. Bolivia, Bolivia did not contest the claimant's allegation that its nationalisation of a power company was an expropriation. Rather, it argued that it was not required to pay compensation because the value of the power company was less than zero at the time of expropriation. The tribunal rejected this argument and awarded approximately US$35 million to the claimant.

In the nationalisation context the dispute is more likely to revolve around the question of whether the expropriation was lawful. This was the case, for example, in Mobil v. Venezuela and ConocoPhillips v. Venezuela.

Regulatory measures

Given the immense public resources involved, as well as the economic, public health and environmental interests implicated, the energy sector tends to be heavily regulated by governments. In this context, regulatory measures of broad application can frequently have an adverse effect on the rights of foreign investors. When such regulatory measures effectively amount to a taking, the sovereign right to regulate in the public interest will not absolve a state of its obligation to pay just compensation. For example, the tribunal in El Paso v. Argentina rejected the notion that 'regulatory administrative actions are per se excluded' from review and differentiated 'between situations where a general regulation can be considered tantamount to expropriation and situations where it cannot'.

Some investment treaties recognise the right of the state to regulate without absolving it of its duty to pay compensation when such regulation substantially deprives an investor of the value of its investment. For example, the Central American-Dominican Republic Free Trade Agreement (CAFTA-DR) states that 'Except in rare circumstances, nondiscriminatory regulatory actions . . . designed and applied to protect legitimate public welfare objectives . . . do not constitute indirect expropriations.' The proposed USMCA and CPTPP also include similar language, providing that 'Non-discriminatory regulatory actions . . . designed and applied to protect legitimate public welfare objectives . . . do not constitute indirect expropriations, except in rare circumstances.'

Most treaties, however, do not seek to expressly draw the line between permissible regulation and impermissible indirect expropriation. This task has fallen largely to investment tribunals. In several cases, tribunals have found that regulatory measures violated the fair and equitable treatment standard but did not constitute an indirect expropriation where the investor retained control over the investment. For example, CMS v. Argentina and Sempra v. Argentina both arose out of a series of regulatory measures in the gas industry promulgated by the Argentine government following the Argentine economic crisis. These measures included the suspension of a tariff adjustment formula for gas transportation and the redenomination of tariffs in pesos. In both cases, the tribunals rejected the expropriation claims because, among other things, 'the Government d[id] not manage the day-to-day operations of the company; and [the claimant] retained full ownership and control of the investment'.

Some tribunals have also considered the investor's expectations regarding regulation in the industry to be relevant to the question of indirect expropriation. In Methanex v. USA, a Canadian corporation argued that California's legislative ban of a gasoline additive methyl tert-butyl ether effectively prohibited the sale of the product in violation of Article 1110 of NAFTA. The NAFTA tribunal rejected Methanex's expropriation claim, stating:

as a matter of general international law, a non-discriminatory regulation for a public purpose, which is enacted in accordance with due process and, which affects, inter alios, a foreign investor or investment is not deemed expropriatory and compensable unless specific commitments had been given by the regulating government to the then putative foreign investor contemplating investment that the government would refrain from such regulation.

The tribunal noted that the claimant did not obtain specific commitments prior to investing in a market known to be the subject of extensive government regulation. This idea has been taken up in the proposed USMCA, which explains that 'whether an investor's investment-backed expectations are reasonable depends . . . on factors such as whether the government provided the investor with binding written assurances'.

Similarly, in Ulysseas v. Ecuador an UNCITRAL tribunal considered claims of temporary and indirect expropriation based on changes to electricity sector regulations. In dismissing the claim, the tribunal explained that, prior to investing, the claimant was 'well aware of the State's efforts to regulate the power sector' and that 'there was no guarantee of profitability of the regulatory system'. The tribunal concluded that the regulations did not amount to a substantial deprivation sufficient to support a claim of indirect expropriation.

Fiscal measures

Arbitral tribunals have generally been reluctant to uphold claims of expropriation based on fiscal actions adverse to a claimant's interests. In most cases, tribunals have found that the fiscal measure at issue did not rise to the level of a substantial deprivation.

Three cases involving fiscal measures imposed by Ecuador illustrate this point. In EnCana Corporation v. Ecuador, an oil exploration company alleged that the inconsistent practice of the Ecuadorian government in paying reasonably expected VAT refunds amounted to an expropriation. The London Court of International Arbitration (LCIA) tribunal acknowledged that, under the broad definition of investment contained in the Canada–Ecuador BIT, the right to VAT refunds for past transactions was properly considered an investment that could be subject to expropriation. As noted by the tribunal, the treaty contemplated 'any kind of asset', including 'claims to money' and 'returns'. The tribunal then set forth a framework for evaluating whether the violation of a statutory obligation to make a payment or refund is permissible, including whether '(a) the refusal is not merely wilful, (b) the courts are open to the aggrieved private party, (c) the courts' decisions are not themselves overridden or repudiated by the State'. Considering these factors, the tribunal ultimately rejected EnCana's expropriation claim.

In Occidental I, a case arising out of the same fiscal measures, another LCIA tribunal held that the withholding of VAT refunds did not affect the overall investment sufficiently to amount to a substantial deprivation, in particular because the treaty at issue did not expressly protect investment returns. However, the tribunal concluded that Ecuador's actions constituted violations of other protection standards.

In Burlington v. Ecuador, a case arising under the US–Ecuador BIT, an oil exploration company alleged expropriation based on Ecuador's imposition of a 'windfall tax' of 99 per cent of oil revenues above a low reference price. After concluding that the BIT provided no guidance on the standard of expropriatory taxation, the ICSID tribunal resorted to customary international law standards. According to the tribunal:

Customary international law imposes two limitations on the power to tax. Taxes may not be discriminatory and they may not be confiscatory. Confiscatory taxation essentially 'takes too much from the taxpayer.' The determination of how much is too much constitutes a fact specific inquiry. Among the factors to be considered one counts first and foremost the tax rate and the amount of payment required. If the amount required is so high that taxpayers are forced to abandon the property or sell it at a distress price, the tax is confiscatory.

The tribunal further reasoned that 'When a measure affects the environment or conditions under which the investor carries on its business, what appears to be decisive, in assessing whether there is a substantial deprivation, is the loss of the economic value or economic viability of the investment.' In order to meet that standard the tribunal stated that '[i]t must be shown that the investment's continuing capacity to generate a return has been virtually extinguished.' Applying these principles, the tribunal dismissed the claim of expropriation based on the windfall tax because, even though it 'considerably diminished [the investor's] profits', it did not render the investment 'unprofitable or worthless'.

An example of a successful argument of indirect expropriation through taxation is the Yukos case. In the Yukos arbitrations, an UNCITRAL tribunal considered a series of fiscal measures affecting an oil production facility in Russia. The claimant, a Cypriot oil company, alleged Russia had imposed tax reassessments, fines, VAT charges and asset freezes, and had forced the sale of the facility in violation of the ECT. The tribunal concluded that while Yukos could have expected an adverse reaction to what the tribunal characterised as tax avoidance strategies, the measures taken by Russia were sufficiently extreme to amount to an unlawful expropriation under Article 13 of the ECT. In the tribunal's view, the fact that the expropriation was in the interest of a state-owned oil company did not mean it was in the public interest. Further, the tribunal concluded that the expropriation was not 'carried out under due process of law', because, among other things, in the prosecutions against Yukos executives, the Russian courts 'bent to the will of Russian executive authorities to bankrupt Yukos, assign its assets to a State-controlled company, and incarcerate a man who gave signs of becoming a political competitor'. The tribunal concluded that the fiscal measures amounted to a 'devious and calculated expropriation' because they entailed the 'complete and total deprivation of the Claimants' investments'.

Cancellation or revocation of fiscal incentives has also been the subject of a series of arbitrations against Spain. In 2007, Spain introduced a subsidy in the form of a feed-in tariff to attract investments in renewable energy sectors, which was later rolled back and ultimately eliminated through a series of regulatory reforms. As a result, a number of investors in the photovoltaic generation sector brought arbitrations against Spain claiming, among other things, that the regulatory measures amounted to an indirect expropriation. While Spain has obtained mixed results to date in the arbitrations, it has generally prevailed on the issue of indirect expropriation because investors have failed to establish a loss of control or ownership over physical assets and shareholdings, or a substantial deprivation of the value of their investments. For example, in dismissing indirect expropriation, the majority of the tribunal in Charanne v. Spain considered that a decrease in profitability is not in itself sufficient to amount to an expropriation. Rather, the loss of value of an investment 'has to be of such a magnitude as to amount to a deprivation of property', requiring more than '[a] simple decrease in the value of shares' or even a 'reduction in profitability [with] serious economic and financial consequences'.

Cancellation of contractual rights

International law has long recognised that contractual rights can be the subject of expropriation. In the seminal Chorzów Factory case, the Permanent Court of International Justice held that the expropriation of a factory also had the effect of expropriating the contractual rights of another German company to operate the factory and exploit certain patents and licences. Similarly, in Phillips Petroleum Co. Iran v. Iran, a case before the Iran-US Claims Tribunal, the company successfully obtained compensation for the expropriation of its rights to share in the oil produced and shareholder participation rights under a joint structure agreement with the National Iranian Oil Company.

In the investment treaty context, tribunals have consistently recognised that intangible interests like contractual rights are capable of expropriation. Reliance on customary international law has become less important as treaties often contain very broad definitions of 'investment' to expressly include contractual rights. For example, the Energy Charter Treaty defines 'investment' as 'every kind of asset, owned or controlled directly or indirectly by an Investor and includes . . . any right conferred by law or contract or by virtue of any licences and permits granted pursuant to law'.

The standard that tribunals routinely apply remains the substantial deprivation test. It is not the case, however, that any breach of contract automatically constitutes an expropriation of contractual rights by a state. An important factor is whether the state acted in a commercial capacity as a party to the contract or in its sovereign capacity and whether the state's conduct implicated the exercise of sovereign powers.

The Electrabel v. Hungary case involved an expropriation claim under the ECT by an investor who had acquired a majority interest in a Hungarian electricity-generation company and obtained a power purchase agreement (PPA). After Hungary acceded to the EU, it terminated its PPAs in the power generation sector to avoid violating EU competition law. The tribunal rejected the investor's claim that the termination of its contractual rights amounted to an expropriation because the PPA was only a part of the investor's interest in the electricity-generation company. Accordingly, the tribunal held that the investor had not experienced a deprivation of its entire investment. On the other hand, in Kardassopoulos v. Georgia, an ICSID tribunal upheld a claim of expropriation of contractual rights. In that case, the tribunal held that the Georgian government's issuance of a decree terminating the investor's rights in a 30-year concession agreement over an oil pipeline 'presented a classic case of direct expropriation'. Similarly, in Occidental II, an ICSID tribunal held that Ecuador's termination of the oil company's participation contract was a disproportionate response to the company's violation of that agreement by transferring an interest in the project to a Canadian investor without prior authorisation. Accordingly, the tribunal concluded Ecuador's conduct constituted a measure 'tantamount to expropriation'.

More recently, the ICSID tribunal in Caratube v. Kazakhstan considered whether certain acts of interference by the state in a private contract between the investment company and the Ministry of Energy and Mineral Resources for the exploration and development of oil fields constituted sovereign acts required for an expropriation. A majority of the tribunal ultimately found that a 'recommendation' sent from Kazakhstan's General Prosecutor's Office to the Minister of Energy and Mineral Resources to 'take measures to notify the investment company to address the [contractual] breaches' and 'settle an issue of unilateral termination of the Contract' was 'an order to terminate the Contract'. The majority also rejected Kazakhstan's arguments that the intervention was routine and that the Prosecutor's Office had acted in accordance with its authority and the terms of the contract. In concluding that there was an unlawful expropriation, the majority found that the termination of the contract was caused by Kazakhstan's intervention through the General Prosecutor's Office in exercise of Kazakhstan's sovereign powers, rather than acting in its private capacity as a party to the contract.

Remedies for expropriation of energy investments

The remedy for expropriation is generally damages, since return of the investment itself is often not possible or reasonable. In addition to the general principles of valuation of damages, a specific question arises in this context about the distinction between lawful and unlawful expropriations.

Limited availability of specific performance

Seeking return of the expropriated asset can be an attractive remedy in energy expropriations, because typically the expropriation relates to an active, productive, long-term asset. Most tribunals have, however, denied specific performance in practice, awarding monetary damages instead. Tribunals have generally held that specific performance is not available as it would either be impossible or impose a disproportionately heavy burden on the state.

The tribunal in Occidental v. Ecuador II considered the availability of specific performance as a remedy in connection with an application for provisional measures. The claimants requested provisional measures to preserve their claim to specific performance of their participation contract, which granted an exclusive right to explore and exploit hydrocarbons in a specified area of the Ecuadorian Amazon. As a result, the tribunal had to determine whether the claimants could establish they had a strongly arguable right to specific performance as part of the application for provisional measures.

Ultimately, the tribunal rejected the provisional measures application. In doing so, it determined that the specific performance requested would impose a disproportionate burden on the state and was materially impossible. For the disproportionality element, the tribunal looked to the rights of both parties and concluded that requiring a state to reinstate a concession after its termination constituted a disproportionate interference with state sovereignty in comparison with the prejudice the claimant would suffer from only receiving monetary compensation. Regarding impossibility, the tribunal observed it is 'well-established' that 'where a State has, in the exercise of its sovereign powers, put an end to a contract or a license . . . specific performance must be deemed legally impossible'. Although the tribunal recognised that specific performance was granted in the well-known TOPCO v. Libya case, which arose out of Libya's nationalisation of its oil industry in the 1970s, it also noted that the case was 'unique and fact specific'. The sole arbitrator in TOPCO v. Libya declined to hold that specific performance was impossible because Libya failed to appear and did not 'bring forward information . . . to establish that there was an absolute impossibility'. Subsequent claims for non-monetary relief – including in cases arising under facts similar to those in TOPCO v. Libya – have generally not been successful.

Evaluation of damages for expropriation

Since monetary damages are the primary remedy awarded in expropriation claims, it is not surprising that there are a number of recurring issues in the assessment of damages. One issue that is specific to expropriation claims, however, is the effect of the state's failure to pay prompt and adequate compensation at the time of the expropriation on the standard for assessing damages.

As explained above, international law permits expropriation that includes, among other requirements, payment of prompt, adequate and effective compensation. Investment treaties frequently articulate the kind of compensation a state must pay as part of a permitted expropriation. The ECT, for example, requires payment of 'the fair market value of the Investment expropriated at the time immediately before the Expropriation or impending Expropriation became known in such a way as to affect the value of the Investment'.

However, treaties generally do not expressly stipulate a standard for compensation when the expropriation does not meet the requirements for lawful expropriation. Tribunals turn to customary international law for guidance – specifically, the full reparation standard as articulated in the Chorzów Factory case. This principle, later codified in the International Law Commission's Articles on Responsibility of States for Internationally Wrongful Acts, calls for compensation in the form of damages equivalent to restitution, which may in any given case differ from the amount that a state is required to pay through a lawful expropriation process.

The question has therefore arisen whether a state's failure to pay compensation renders unlawful an expropriation that complies with all the other requirements for a lawful expropriation. Three cases arising out of Venezuela's nationalisation of the oil industry – ConocoPhillips, Mobil and Tidewater – addressed this issue but adopted different approaches.

The tribunal in ConocoPhillips v. Venezuela held that Venezuela had negotiated in bad faith when it proposed to pay book value for the expropriation because the Netherlands–Venezuela BIT required it to pay market value. Accordingly, the tribunal held the expropriation was unlawful, triggering the full reparation standard contained in Chorzów Factory. One year later, the ICSID tribunal in Mobil v. Venezuela held that 'the mere fact that an investor has not received compensation [at the time of the proceedings] does not in itself render an expropriation unlawful'. The tribunal concluded that the claimant had not met its evidentiary burden to show that Venezuela's proposal of compensation was incompatible with the treaty requirement of 'just' compensation and found that the expropriation was not unlawful. In Tidewater v. Venezuela, a third ICSID tribunal surveyed numerous arbitral awards and concluded that 'expropriation only wanting fair compensation has to be considered as a provisionally lawful expropriation, precisely because the tribunal dealing with the case will determine and award such compensation'. Thus, the nature of any offer of compensation made by the state, as well as the state's general conduct during negotiations, may inform the tribunal's analysis.

Practical considerations for energy investments

To maximise protection in the event of expropriation, several key practical considerations should guide an investor considering an energy investment in a foreign country.

First, investors may structure energy investments to take advantage of investment protections. Each treaty is different. Even though many treaties contain some form of prohibition of unlawful expropriation, the scope of this prohibition, as well as the extent of an arbitral tribunal's jurisdiction, can vary meaningfully across instruments. Some treaties, including several treaties signed by the United States, contain a carve-out from certain treaty protections for matters of taxation. For example, the US–Ecuador BIT at issue in Occidental v. Ecuador stated that dispute settlement 'shall apply to matters of taxation only with respect to . . . expropriation'. Other treaties, including those concluded by former Soviet states, may limit the disputes that can be submitted to arbitration to the question of the amount of compensation for any expropriation. The BIT between the United Kingdom and the USSR at issue in RosInvest Co. UK Limited v. Russian Federation is one example. It restricted arbitration to legal disputes 'either concerning the amount or payment of compensation under Article . . . 5 of this Agreement [Expropriation] or concerning any other matter consequential upon an act of expropriation in accordance with Article 5 of this Agreement'. The tribunal in that case interpreted the clause as a limitation to its jurisdiction such that it did not have jurisdiction over all aspects of an expropriation. More recently, the proposed USMCA, for example, would significantly curtail the ability of investors to arbitrate investment disputes: after a period of three years from the termination of NAFTA, Canada will no longer allow US investors to submit investment disputes to arbitration, and Canadian investors will not be able to arbitrate investment disputes under the USMCA. Mexico and the US have separately negotiated arrangements to allow arbitration of certain specific claims, such as direct expropriation, but indirect expropriation claims are not subject to arbitration unless they relate to certain investments, such as government contracts in the oil and gas or power generation sectors.

In treaty planning it is therefore important to consider available substantive protections as well as the scope of a tribunal's jurisdiction over any dispute.

The decision in Mobil v. Venezuela confirms that such treaty planning is not in and of itself abusive if it occurs before the dispute arose. In 2005, in anticipation of a wave of nationalisations in Venezuela, Exxon restructured its investments in Venezuela through a Dutch holding company to gain the protection of the Venezuela–Netherlands BIT. Venezuela nationalised Exxon's oil and gas exploration projects in 2007 and Exxon commenced ICSID proceedings. The arbitral tribunal held that the restructuring did not amount to an abuse of the treaty system.

Second, investors should consider the availability of other substantive investment treaty protections. When expropriation claims are limited by the applicable treaty, or the investor is unable to establish expropriation, other substantive treaty protections such as fair and equitable treatment may be available. This is demonstrated by CMS v. Argentina, Sempra v. Argentina, Occidental II and more recently Novenergia v. Spain, where the arbitral tribunals dismissed the investor's expropriation claims but found a violation of fair and equitable treatment. Some recent or proposed trade agreements have placed additional constraints on fair and equitable treatment protections.

Finally, even though treaty protections give investors some degree of comfort, they are no substitute for contractual guarantees. Contractual protections can offer greater specificity and certainty than treaty standards – even a standard as common as the prohibition on unlawful expropriation. Stabilisation clauses, for example, can be a valuable contractual safeguard in long-term investments like energy concessions, and can offer more robust protection against unwelcome regulatory change than the substantial deprivation threshold required for a successful expropriation claim.

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