Paraguay and Itaipú: what “cheap surplus hydro” actually means

Paraguay’s mining story is a sentence about civil engineering. The Itaipú dam on the Paraná River has about 14,000 MW of installed capacity, split equally with Brazil. Paraguay’s half is far larger than domestic demand — often cited as covering the large majority of the country’s electricity use, with the rest historically exported, much of it to Brazil, at prices Paraguay has spent decades trying to renegotiate. Yacyretá (with Argentina) and the smaller Acaray plant add to a structural surplus. For a miner, that read as: stranded renewable baseload, landlocked, looking for an offtaker.

How large did it get?

By the second quarter of 2026, Hashrate Index put Paraguay around 4.3 percent of global hashrate. That is extraordinary for a country of roughly seven million people. Public miners made it visible: HIVE Digital completed a 200 MW facility at Yguazú after buying the site from Bitfarms, with further expansion talked about toward AI. Local press in Alto Paraná described a cluster of legal offtakers around ANDE substations — and a parallel world of illegal farms.

The illegal layer is not a footnote. In July 2024 the Senate passed penalties of up to ten years in prison for stealing electricity to run unauthorised mining. Towns complained about noise. ANDE and the ministry were asked for lists of authorised connections. A surplus that is not metered is not a surplus. It is theft with a hashrate.

The tariff was never a law of physics

Early industry lore put mining power near 3 US cents per kilowatt-hour. That number did not survive contact with ANDE. After Itaipú’s generation tariff with Brazil was reset higher, Paraguay raised miner rates. El País, working from 2024 figures, described legal offtakers paying on the order of $44–$60 per megawatt-hour plus tax — roughly a doubling from the folklore print. Hashrate Index in 2026 wrote that costs had roughly doubled from the early $0.03/kWh days, and that ANDE had added a three-month energy deposit: for a 40 MW site, about $4.5 million cash up front. Undercapitalised operators left. The market bifurcated into balance-sheet miners and everyone else.

There is a further cliff. Large intensive consumers — miners and AI halls — have been pushing to extend special contracts toward 2037. ANDE had pointed to 31 December 2027 as the end of a regime. Surplus hydro with a two-year remaining tenor is a different asset from surplus hydro with a twenty-year PPA. Anyone modelling Paraguay on a 2022 slide should re-read the offtake.

The state as miner

In 2026 ANDE explored putting seized machines to work on surplus hydro in a pilot with a US technical partner, Morphware — a telling inversion. The utility that spent years chasing theft now wants the watts that were being stolen, under its own meter. That is closer to Bhutan’s instinct (the state captures the option) than to a laissez-faire hosting market. It is also an admission that the electrons were always the point.

What to take from Itaipú

• A dam can create a real surplus. A brochure tariff cannot be assumed for the life of an ASIC.
• Deposits, rate classes, and contract end-dates are the diligence, not the name of the river.
• Energy theft next door to a legal farm is a counterparty and reputational risk, not local colour.
• If you are the generator, selling surplus to known counterparties under your meter is the clean version of this story.

NexusArc does not host in Paraguay. We use the case because Indian captive plants, Nigerian gas sites, and any “too much power, too little demand” conversation fail in the same places: unmetered loads, political rate resets, and contracts that expire before the hardware does. We put those items in the hosting letter. If they cannot be answered, we do not place the machines.