An airport company owns this waterfall, and both Wikipedias missed it

There is a power station at Arippara. It has been generating since 2021, it cost about ₹52 crore, and it is owned by an airport.

The Arippara Small Hydroelectric Project is a 4.5-megawatt run-of-the-river scheme — a weir and a diversion, with no reservoir behind it. The implementation agreement was signed in October 2014. It was commissioned on 13 October 2021 and inaugurated by the Chief Minister in early November; three inauguration dates circulate, which is why we give the commissioning date instead. It generates somewhere between thirteen and fourteen million units a year, and it is held on a thirty-year build-own-operate-transfer lease under the Kerala Small Hydro Power Policy, as an independent producer selling to the state electricity board.

The owner is the story

It is not the electricity board. It is Cochin International Airport Limited — the company that in 2015 made Kochi the world’s first fully solar-powered airport. Its managing director described Arippara as CIAL’s biggest step since going solar.

And the same river already carries the Chembukadavu and Urumi small-hydro weirs, so this is not an isolated intervention on the Iruvanjipuzha but the newest of several.

What both Wikipedias still say

That plans for a hydroelectric project here remain in proposal stages. Five years after commissioning. Anyone writing about Arippara from the encyclopaedias — which is most of what has been written about it — has the plant as an idea rather than as a building with turbines in it.

It is worth naming that failure mode, because it is the one that catches careful writers. The encyclopaedia was right when it was written and nobody went back. The correction here came from three independent directions: the operator’s own site giving the commissioning date, the mapped geometry of the weir, powerhouse and access road on OpenStreetMap, and an April 2026 news report about a check-dam cleaning upstream sending muddy water past the falls — which is not a thing that happens to a project in proposal stages.

The geometry, and the inference not to draw

The intake weir sits roughly 500 to 600 metres upstream of the falls. The powerhouse is about 110 metres downstream. So the falls themselves lie inside the bypassed reach — the stretch of river between where the water is taken out and where it is put back.

The obvious conclusion is that the plant has dried the falls out, and it is wrong. CIAL’s own site states that the plant runs from June to November only — the monsoon months. Abstraction therefore happens when the river is in spate and nobody should be anywhere near the water. In the November-to-May window when the falls are actually visitable, the plant is largely idle and the flow you see is essentially natural.

The dry-season trickle at Arippara is the seasonal hydrograph of a Western Ghats river, not a diversion. We are saying so explicitly because the opposite claim is easy, satisfying and false, and because November straddles the boundary in any case.

The same discipline applies to safety. The hazard on this reach is upstream rainfall, not plant operation: a run-of-river weir has no storage to release, and no plant-caused surge is documented anywhere. What is documented is a water-quality effect — the April 2026 silt.

What we are not saying

The project was delayed by the 2018 and 2019 floods, by the pandemic, and by litigation. The existence of the litigation is sourced; the petitioner, the court and the subject are not, anywhere we could reach. So the sentence stops there rather than being filled in.

Malayalam sources record a local fear that the falls would disappear once the project was built. That is an apprehension, recorded as one. We found no action council, no protest and no named campaign, and no evidence the falls have in fact disappeared — a claim contradicted by every photograph taken since 2021.