The Dispute:

Biwater Gauff v Tanzania arose from a private-sector water and sanitation project in Dar es Salaam. Biwater Gauff entered into arrangements concerning the operation and management of water infrastructure, but the project subsequently deteriorated into a major dispute between the investor and Tanzanian authorities. The conflict culminated in a series of State measures, including the termination of the contractual relationship, withdrawal of a VAT certificate, seizure of assets and installation of a new operator.¹ The case presented the Tribunal with a familiar but difficult investment-law problem:

When does the State’s intervention in a troubled public-service investment remain regulation, and when does it cross the line into treaty breach?

The Treaty Framework:

The relevant UK–Tanzania BIT contained several overlapping standards. These included fair and equitable treatment, full protection and security, protection against unreasonable or discriminatory measures, and protection against expropriation.  That overlap mattered because the same State conduct could potentially engage more than one treaty obligation. The Tribunal therefore had to distinguish among different legal standards while also considering the cumulative effect of the State’s conduct.²

The Tribunal’s Reasoning:

Fair and equitable treatment

The Tribunal considered whether the BIT’s reference to fair and equitable treatment created an autonomous treaty standard or simply reflected the customary international-law minimum standard. It declined to make a universal proposition applicable to every BIT. Instead, it emphasised that the content of fair and equitable treatment depends partly upon treaty wording and context.³The Tribunal nevertheless identified several components relevant to the standard, including reasonable and legitimate expectations, good faith, transparency, consistency and non-discrimination.⁴

That formulation is important because it demonstrates that FET does not operate as a free-standing guarantee of commercial success. Instead, the analysis is directed toward the manner in which governmental conduct affects an investment.

Regulation and escalation:

The Tanzanian Government’s intervention occurred in a highly contested public-service environment. The Tribunal did not treat every State measure connected to the contractual breakdown as an expropriation. Indeed, many of the investor’s allegations were rejected.

What ultimately mattered was the cumulative effect of specific conduct. The Tribunal found that the public announcement terminating the lease contract, the subsequent treatment of City Water’s staff, the withdrawal of the VAT certificate, and the seizure of the company’s assets together amounted to breaches of fair and equitable treatment and unreasonable and discriminatory treatment. The seizure of the investment’s assets and removal of management also constituted a breach of full protection and security.⁵ Most significantly, the Tribunal characterised the cumulative conduct as an expropriation under Article 5 of the BIT.⁶

But liability did not automatically produce damages

This is one of the most instructive aspects of Biwater Gauff v Tanzania. The Tribunal found treaty breaches but dismissed the investor’s damages claims. That distinction matters enormously. International investment arbitration does not operate on a simple equation where treaty breach equals automatic compensation.

Liability and compensation are legally separate questions. A claimant must still establish the basis and extent of compensable loss. Biwater therefore demonstrates that a State may be found to have breached substantive treaty standards without a corresponding monetary award.⁷

Why the case matters

The case is particularly useful for understanding regulatory escalation. The problem was not simply that Tanzania regulated a failing infrastructure project. The tribunal’s findings focused on the sequence and combination of measures through which State authorities terminated the relationship, communicated the decision, withdrew a regulatory benefit, took control of assets and replaced management. This raises a broader question about the boundary between public administration and expropriation. A State may have legitimate reasons for intervening in essential infrastructure. But the way the intervention is carried out can determine whether the conduct remains within the State’s regulatory space.

The deeper question

Biwater Gauff v Tanzania therefore complicates the familiar binary between “investor protection” and “State regulation”. The Tribunal did not say that Tanzania had no authority to intervene. Instead, the case turned on how that authority was exercised. That makes the case especially valuable for analysing investment governance in sectors such as water, energy and transport, where State authorities are simultaneously regulators, contracting authorities and providers of essential public services.

Case takeaway

Biwater Gauff v Tanzania demonstrates that the decisive issue in investment arbitration may not be whether a State possessed regulatory authority, but whether the manner and cumulative effect of its intervention crossed the treaty threshold.

Read another Tanzanian Case Here:

FOOTNOTES

1. Biwater Gauff (Tanzania) Ltd v United Republic of Tanzania (ICSID Case No ARB/05/22), Award, 24 July 2008, paras 354, 696, 814(b). ↩︎
2. ibid, paras 354, 522–36. ↩︎
3. ibid, paras 587–91. ↩︎
4. ibid, paras 601–03. ↩︎
5. ibid, paras 691–96, 814(b)–(c). ↩︎
6. ibid, para 814(b). ↩︎
7.  ibid, para 814(e). ↩︎