ClearStream Power
Concrete diversion weir and headrace structure beside the river running in spate.

Run-of-river hydropower

Baseload power, generated beside the factory that uses it.

We build and operate small run-of-river hydro stations and sell the electricity direct to the industrial users next to them.

What we do

A small river with a steady fall is a power station that never buys fuel.

ClearStream Power develops, funds, builds and operates small hydroelectric stations on rivers that already run past industrial demand — and sells the output to that demand under long-term contract, rather than into a grid at a wholesale price.

The stations are deliberately modest: a low weir, a channel, and a machine of a few hundred kilowatts. Nothing is impounded, nothing is flooded, and the river leaves the site at the same rate it arrived. What makes the model work is not scale — it is proximity. Generation sited within a few kilometres of a continuous industrial load avoids the transmission, the losses and the tariff structure that sit between a distant power station and the meter.

01 — BUILD

Develop and own the asset

Each scheme is funded and owned through a ring-fenced project company, on land and water rights secured for the life of the station.

02 — CONTRACT

Sell under a long-term PPA

Energy goes to a single offtaker or a few adjacent industrial users on a long-dated power purchase agreement, at a discount to the prevailing tariff and a lower escalation rate.

03 — OPERATE

Run it for twenty-five years

Remote monitoring, a local operating crew, and a drivetrain chosen for few moving parts. Civil works have a design life measured in decades.

One scheme, three units, 525 kW.

The first unit is built and running in the Matsapha industrial area of Eswatini. Two more are at completed feasibility, with equipment out to quotation.

See the current project

Why this, and not something else

  • Against solarHydro at a good site generates through the night and through the rainy season. A 420 kW hydro station produces roughly what 1.2 MW of solar produces, on a fraction of the land, without storage to make it firm.
  • Against dieselNo fuel to buy, no fuel to haul, no exposure to the fuel price. The operating cost of a run-of-river station is labour, insurance and a spares budget.
  • Against a large damNo reservoir, no resettlement, no sediment trap, no methane. A low weir and a bypass channel change the river's shape over a few hundred metres, not its regime.
  • Against buying from the gridA long-dated PPA fixes the price of a large share of a factory's load and caps its escalation, which the tariff will not do.

How these stations work

Take a stretch of river with a few metres of fall, borrow the water for two hundred metres, and give it back. Everything else is detail.

net head 3 – 4 m river Low weir raises the level, stores nothing Headrace channel Trashrack and intake gate Powerhouse open concrete pit Permanent magnet generator no gearbox, no excitation vertical shaft Guide vanes the only flow control Propeller runner draft tube Tailrace water returns to the river, same volume, same course switchboard transformer The customer a few km away
Schematic section through one generating station — drawn to explain the arrangement, not to scale and not a photograph of a built plant. Flow left to right.
Intake, existing station
The same arrangement built: the forebay pool, the inclined trashrack screens with their hoists, and the powerhouse behind. Everything in the drawing above between the headrace and the flume is in this frame.

Run-of-river

The river is borrowed, not stored.

A low weir lifts the water surface by about a metre and turns most of the flow into a channel cut alongside the river. The channel runs to a concrete headrace that holds the water a few metres above the level downstream. That difference — the net head — is the entire energy resource.

Because nothing is impounded, output follows the river. In a good month the machine runs flat out; in the driest weeks it stops. There is no reservoir to drain and no operating decision to get wrong.

The machine

Chosen for a site far from a service centre.

A vertical-shaft, open-flume, fixed-blade propeller turbine, direct-coupled to a permanent magnet generator through a fully rated variable-speed drive. No gearbox, no excitation system, no blade-pitch hub, no rotating oil distributor.

The variable-speed drive does electrically what a Kaplan runner does mechanically — holding blade incidence near optimum as flow varies — which removes the most maintenance-hungry assembly in a low-head machine. Adjustable guide vanes close under a hardwired emergency shutdown that does not depend on grid power, so the station survives a load rejection without resistive dump loads.

Design choiceWhy
Open flume, no spiral casingThe powerhouse becomes a rectangular concrete pit a competent local contractor can form
Fixed-blade propeller, not KaplanVariable speed recovers almost all of the part-load efficiency without the blade-pitch mechanism
Permanent magnet generatorNo brushes, slip rings or rotating rectifier — one fewer failure mode on a remote site
Direct coupled, no gearboxRemoves the single most common cause of unplanned outage in small hydro
Guide vanes with hardwired ESDFast flow shutoff on loss of grid, so no dump loads and a simpler electrical balance of plant
Stations in series down one channelOne weir, one intake and one set of approvals serve more than one machine

What the river gets back

A scheme that has to live in the river for twenty-five years.

Every drop taken into the channel is returned to the river a few hundred metres downstream. Sediment passes, because the headrace is flushed through a sluice rather than settled in a basin. Flood flows overtop the weir across its full width and run down the channel past overflow walls built for the purpose, rather than into the powerhouse.

The runner turns slowly by the standards of hydro machinery, and blade tip speed is stated by every supplier bidding for the work, because fish passage is part of how we score the bids.

Our first scheme

Three generating units on one reach in the Matsapha industrial area of Eswatini — 525 kW in total. The first is built and running; the other two are in development.

1 of 3
Units built and running
525kW
Site capacity once complete
100%
Ownership of the project company

What is built

A station on this river has been running for some time.

Before proposing anything to anyone, we built one. A single-unit run-of-river station on this reach has been constructed, commissioned and operated — through a wet season and a dry one. It is the reason we know what this river does, what the civil works cost, and what a machine of this type needs from a local operating crew.

Everything on the How it works page is a description of that plant, not a theory about one.

What is next

Two more units, in series, down the same channel.

A second and third unit are in development on the same reach, adding about 320 kW and taking the site to roughly 525 kW across three units. One weir, one intake and one set of approvals serve both.

Independent feasibility is complete — hydrology, civil layout, turbine selection and energy yield assessed by a consulting hydropower engineer, and an outline equipment specification issued to manufacturers for quotation.

On site

Running
The pilot station under flow. The runner turns slowly by the standards of hydro machinery — the reason blade tip speed is a scored item in our equipment tender.
Aerial view of the concrete headrace structure and spillway beside the river in flood.
Headrace structure and overflow on the reach, with the river running high alongside.
Propeller turbine runner and guide vane assembly in a flooded concrete open-flume pit.
Open-flume runner set in the concrete pit of the pilot station.

How it is held

The asset sits in Eswatini. The company that owns it sits in ADGM.

The scheme is owned and operated by Hydro and Solar Energy (Pty) Ltd, an Eswatini company holding the project, the plant and the local operating team. Hydro and Solar Energy is a wholly owned subsidiary of Clear Stream Power SPV Ltd, registered in the Abu Dhabi Global Market.

Where this stands The first unit is built and operating. The second and third are at completed feasibility stage and are not yet under construction; detailed design, geotechnical investigation and the grid connection agreement with the Eswatini Electricity Company remain to be concluded. The 525 kW figure is the capacity of the site once all three units are commissioned. No power purchase agreement for the new units has been signed.

The engineering pack is available on request.

Hydrology, flow duration analysis, civil layout, turbine specification and energy yield — released to counterparties under NDA.

Request the technical pack

About ClearStream Power

A ring-fenced development company, registered where lenders expect to find it, building assets where the water is.

Clear Stream Power SPV Ltd is a private company limited by shares, incorporated in the Abu Dhabi Global Market — an English common-law jurisdiction with its own courts and its own commercial legislation.

The structure is deliberate. Project finance, shareholder arrangements and offtake contracts sit in a legal framework that international lenders and equipment suppliers already underwrite, while the asset, the licence, the water right and the operating crew sit in Eswatini — held by our wholly owned Eswatini subsidiary, Hydro and Solar Energy (Pty) Ltd. Each scheme is intended to be held in its own vehicle, so that one project’s obligations never reach another’s.

The founding team combines an owner-operator with two decades of building and running industrial assets in southern Africa, and an operations director resident in the region. The engineering is bought in from specialists and tested against suppliers competing for the work, rather than asserted in-house.

Registered name
Clear Stream Power SPV Ltd
Registration number
36752
Jurisdiction
Abu Dhabi Global Market, UAE
Companies Regulations 2020
Incorporated
12 May 2026
Telephone
+971 56 493 4787
Email
enquiries@clearstreampower.com
Clear Stream Power SPV Ltd Abu Dhabi Global Market · registration 36752 100% Hydro and Solar Energy (Pty) Ltd Eswatini · project company and operator generating stations, plant and operating team
Clear Stream Power SPV Ltd holds the Eswatini project company outright. Each future scheme is intended to sit in its own vehicle, so one project’s obligations never reach another’s.

How we work

ENGINEERING

Independent, and written down

Hydrology, civil layout, turbine selection and energy yield are assessed by an independent consulting hydropower engineer and issued as a technical memorandum before any equipment is ordered.

PROCUREMENT

Competed against a specification

Turbine-generator packages are bought against an outline technical specification with stated guarantees on output, cavitation and ten-year spare parts availability — not against a supplier's brochure.

COMPLIANCE

Inside the utility's rules

Embedded generation is designed to the Eswatini Electricity Company's requirements and the NRS 097 series, with the grid connection agreed before equipment is ordered.

Where we are ClearStream Power is early. One generating unit is built and operating and two more are in development; none is yet in commercial operation under a long-term ClearStream power purchase agreement. We would rather say that plainly than describe a pipeline as a portfolio.

Talk to us

If you run a continuous industrial load near a river in southern Africa, there is a conversation worth having.

Who we want to hear from

Industrial energy users in and around Matsapha, or on any reach with usable fall, who want a long-dated price for a meaningful share of their load. Bring twelve months of metered consumption and we can tell you quickly whether a scheme is worth studying.

Turbine and equipment manufacturers building low-head open-flume axial-flow units. Ask us for the specification and we will send it with the flow data you need to price against.

Landowners and water right holders with a weir, a mill race, a bend in a river or an old scheme that stopped working.

Lenders and development finance institutions funding small embedded generation in the SADC region.

General enquiries
enquiries@clearstreampower.com
Telephone
+971 56 493 4787
United Arab Emirates
Registered office
Al Khatem Tower, WeWork Hub 71
ADGM Square, Al Maryah Island
Abu Dhabi, United Arab Emirates
Project office
Matsapha, Eswatini
Company
Clear Stream Power SPV Ltd
ADGM registration 36752