Tether's failed Bitcoin mining project in Uruguay offers a cautionary lesson for an industry built around one simple equation: turning cheap, reliable electricity into Bitcoin.

The company behind the project is best known for something else: Tether issues USDT, the world's most widely used stablecoin, and in 2023 announced a broader push into energy and mining infrastructure as part of its expansion beyond stablecoin issuance.

A $120 Million South American Bet

In 2023, Tether chose Uruguay as its first major South American mining venture, describing the country as a “perfect platform” because of its abundant renewable energy, reliable grid, and political stability. The company established two mining sites in the rural Florida department, with a former contractor estimating that Tether spent about $120 million on the build-out — roughly $60 million per site.

The project was intended to serve as a launchpad for expansion into neighboring Brazil, Paraguay, and Argentina. Of the three, Paraguay has the longest track record with miners, having long attracted them with cheap hydropower from the Itaipú dam it shares with Brazil.

But the venture ran into a problem that abundant renewable energy could not solve: how much electricity could Tether actually count on receiving?

The Power Allocation Dispute

At the center of the conflict was Tether's contract with Uruguay's state-owned utility, UTE, which dominates the country's power system from generation through distribution. Tether understood the agreed power allocation as a minimum that could be increased as the mining sites expanded. UTE interpreted the same figure as a maximum. As electricity demand grew, the facilities were at times left without enough power for days at a time.

By late 2024, the disagreement had already developed into a serious operational problem.

Attempts to renegotiate the arrangement failed. In 2025, Tether's local entity, Microfin, stopped paying its electricity bills and notified UTE that it intended to terminate the contracts. UTE eventually cut power to the sites on July 25, 2025. Tether later told labour authorities that it would cease operations and lay off most of its local staff.

Why Predictable Power Matters

The collapse matters because Bitcoin mining does not simply need renewable electricity. It needs predictable electricity, at a price that allows mining machines — specialized hardware that earns revenue only while it is powered — to run continuously.

Uruguay generates the vast majority of its electricity from hydro, wind, and solar, giving it one of the world's strongest renewable-energy profiles, but that does not automatically make it a low-cost Bitcoin mining destination. Analysts cited by Reuters said the country's relatively high electricity costs make it less attractive for an activity whose economics are heavily dependent on cheap power. Instead, Uruguay's reliable grid and connectivity may be more valuable for data centres and AI computing, where the economics can support higher power costs — a pivot several large North American mining firms have already made as they repurpose capacity to host AI workloads.

Timing also made the problem worse. Bitcoin mining economics have become tougher since the April 2024 halving reduced the block reward from 6.25 BTC to 3.125 BTC, while changes in Bitcoin's price and rising operating costs have increased pressure on miners to secure cheaper and more efficient power.

The Uruguay case therefore highlights a distinction that is easy to miss in discussions about sustainable Bitcoin mining: renewable energy is a source of power. It is not, by itself, a viable mining business model.

The Real Question for Miners

Miners need clear contractual rights to power, dependable capacity, competitive tariffs, predictable scaling, and economics that remain viable when Bitcoin prices or mining rewards change.

Tether's experience shows that a country can have abundant clean energy and still be a difficult place to mine Bitcoin. For miners, the real question is not “Is the electricity renewable?” It is: “Can I secure enough of it, at a predictable price, under terms that allow me to stay profitable?”

Source: BitcoinKE