The Heat Under the Bath House
Water comes out of the ground at the foot of Nevis Peak at around 42°C, and a hotel was built over it in 1778. Turning that heat into electricity has been declared policy on Nevis since 2008, and the island still runs on imported diesel.
The Bath Hotel stands on the edge of Charlestown, a long stone building put up in 1778 by a merchant called John Huggins for the planters and naval officers who came to take the water. Below it, in a stone house at the bottom of the garden, the water still arrives: a spring that comes out of the hillside at around 42°C, hot enough that most people get in slowly. It has been doing this for longer than anyone on the island has been writing things down. The hotel is government offices now. The bathing house is open, cheap, and mostly full of Nevisians.
What the spring is, geologically, is a leak. Nevis is a single volcanic cone rising to 985 metres, and beneath it sits a heat source that has been pushing hot water through fractured rock to the surface at half a dozen points around the base of the mountain. Directly above that heat source, the island's electricity is generated by burning diesel that arrives by ship. That sentence has been true for every year of the island's history, and since 2008 the Nevis Island Administration has been trying to make it stop being true.
What the drilling found
In 2008 a developer, West Indies Power, drilled exploratory wells at Spring Hill, in the hills above Charlestown. The results were not ambiguous and they were not marginal: a high-temperature reservoir at usable depth, comfortably capable of supporting a power station of the size the island needed and a good deal more. The plan that followed was for roughly 10 megawatts for Nevis itself, then a submarine cable across the Narrows to Saint Kitts, and — in the more expansive versions circulated at the time — cables onward to the US Virgin Islands and Puerto Rico, turning a country of fifty thousand people into an exporter of electricity. Nevis had discovered the one thing an eastern Caribbean island is not supposed to have, which is a domestic energy resource.
Why a small island is a hard place to finance a power plant
None of it was built. The wells were capped, the agreement lapsed, and by the middle of the 2010s the Nevis Island Administration had terminated the arrangement without a turbine ever having turned. The reason is not geology and it is not politics; it is the shape of the cost. A geothermal project spends most of its money at the beginning, drilling deep wells that each cost millions of dollars and may produce nothing usable, and it earns that money back over decades of selling power. Lenders will carry that risk if the electricity has somewhere reliable to go. Here, the buyer is NEVLEC, a state-owned utility on an island of eleven thousand people whose peak demand is measured in single figures of megawatts. There is no way to spread a dry hole across a customer base that small. Kenya or Iceland can drill a duster, write it off and move to the next pad; Nevis drills one well and the project is either alive or finished.
The heat has never been in doubt. What has failed twice is a financial structure, and that is the actual constraint on small-island energy policy — not the resource, not the engineering, and not the will.
The second attempt
The Administration signed again in 2018, with Nevis Renewable Energy International, for a plant of about the same size and the same cable across the Narrows. A rig went up to Hamilton Estate in 2022 — a different site from the 2008 wells — to drill for production rather than proof. Completion dates have moved more than once since, in the way they always do when a project of this kind is being assembled from concessional lenders, climate funds and development banks in a jurisdiction most of them have never lent into. It is worth noting how thin the regional precedent is: the only geothermal power station operating anywhere in the island Caribbean is at Bouillante in Guadeloupe, running since 1986. Dominica has been working on one since the 2000s. Montserrat drilled and stopped. The rock under these islands is the same rock; the balance sheets are the problem.
What Saint Kitts did instead
The larger island took the other route, which is solar. A utility-scale plant beside the airport pairs roughly 35 megawatts of panels with a battery of some 44 megawatt-hours — at the time it was contracted, the largest solar-plus-storage installation in the eastern Caribbean — and it is intended to cover a substantial share of Saint Kitts' daytime load. Solar has the opposite risk profile to geothermal: it is modular, quick to build, and the cost is known before anything is dug. Its limitation is that it stops at sunset, which is why the expensive part of that project is the battery rather than the panels. What neither the panels nor the battery provide is firm baseload, and geothermal remains the only renewable source available to either island that runs at three in the morning in November without storing anything first.
The bill it would replace
The case for going to this much trouble is not environmental in the first instance; it is fiscal. Fuel is among the largest single items on the federation's import bill, it is bought in US dollars against an East Caribbean dollar pegged at 2.70 since 1976, and every cent of it leaves the country. Electricity tariffs across the eastern Caribbean are among the highest in the Americas, and they are embedded in everything downstream — the hotel rate, the supermarket shelf, the cost of pumping and treating water on islands where drought is a recurring feature and desalination is the fallback. A tariff set by the price of diesel in Rotterdam is a tariff no island government controls. The government elected in 2022 built its programme around a "sustainable island state" agenda with the end of diesel generation as its headline, which is an ambitious target on a five-year horizon and a rational one on a thirty-year horizon.
A cable across the Narrows
There is one more thing in the plan that nobody on either island misses. The Narrows is three kilometres wide, and the cable would run under it from the smaller island to the larger. Nevis has its own assembly, its own premier and a constitution that gives it a route out of the federation — a route it came close to taking in 1998, when a secession referendum won a clear majority and fell short of the two-thirds it needed. The standing Nevisian argument is that the island contributes more to the federation than it receives back. A geothermal field under Nevis Peak selling power to Basseterre would rearrange that argument completely, and everyone involved understands it. The heat has been coming out of the ground beside the bath house for centuries without anyone drawing a political conclusion from it. If the wells come in, it will be the first thing the island has ever had that Saint Kitts needs.