Lesotho sold its only surplus resource downhill and bolted a power plant to the pipes

Lesotho, a landlocked kingdom of about 3 million entirely surrounded by South Africa, had almost no exportable resources except one: highland rainfall. Meanwhile Gauteng, South Africa's industrial heartland, faced chronic water shortages. The obvious option for a poor country was a one-off payment or aid.

Instead the 1986 treaty created the Lesotho Highlands Water Project as a binational venture: South Africa funds the water-transfer infrastructure, but all of it — the Katse and Mohale dams and roughly 200 km of tunnels — is built and owned in Lesotho, run by the Lesotho Highlands Development Authority. A cost-benefit sharing formula (56% to Lesotho, 44% to South Africa, on the grounds that Lesotho hosts and must maintain everything) produces the royalty stream Lesotho collects.

The designers then made the same water pay twice: on its way north, flow from Katse passes through the 'Muela hydropower station, which today supplies about 51% of Lesotho's electricity demand — near energy independence as a by-product of the export tunnels.

The result, per Bloomberg reporting cited in 2026, is close to $300 million a year in royalties — about 15% of government revenue and more than 10% of the economy of a roughly $2 billion GDP country — from a resource Lesotho could never drink itself. Phase II (the Polihali Dam, a 38 km tunnel and the Oxbow hydropower scheme) was agreed in 2011 to expand both the water sales and the power output, with Polihali expected to raise 'Muela's output by 30%.

Sell the water, keep the dams, and make the buyer fund both

Pricing the deal on avoided cost to South African users made water Lesotho's most valuable export.

Requiring all infrastructure on Lesotho soil turned a sale into permanent national assets.

Royalties tied to a 56/44 cost-benefit split scale with use instead of expiring like aid.

Putting turbines in the delivery tunnels monetized gravity the project had to build anyway.

A treaty structure survived both signatory regimes — apartheid-era South Africa and military-era Lesotho.

A resource you cannot consume is still an asset: structure the deal so the buyer finances the infrastructure and you keep ownership, royalties and by-products.

Phase I runs and pays; Phase II (Polihali Dam, Oxbow hydropower) is under construction after delays, with water delivery targeted for 2028/29. Lesotho is now negotiating to raise its royalty terms further and eyeing floating solar on its reservoirs to become a net energy exporter.