About
Engineering-led thermal efficiency.
Mexel Energy Sustain (Pty) Ltd is a South African company combining Mexel®432 chemistry, IoT dosing and data-driven verification to address cold-end fouling where site data shows a measurable condenser or cooling-water performance penalty.
30%
Cleanliness-factor improvement
(Kriel Unit 6, report conclusion)
4.3°C
Later actual TTD
(Kriel Unit 6 report observation)
5ppm
Daily trial dose
(30 min/day Kriel protocol)
93%
Aerobic bacteria kill
(Lab biocide comparison, report p.14)
Technical Documents Available On Request
Our technical approach
We do not start with a catalogue of products. We start with how energy and water are being used at the cold end: condensers, cooling towers, exchangers and critical cooling-water loops. From there we design an intervention that makes technical sense for that specific system.
TES is the way we structure this thinking: Mexel®432 chemistry, IoT dosing, a focused cooling-water performance view and a clear verification framework. Each element is simple; the value is in how they work together.
Principles
- • Transparent, data-driven, engineering-first.
- • Respect existing station and plant protocols.
- • Scope tightly; avoid overpromising or overselling.
- • Let measured results, not claims, drive decisions.
Why TES exists
At many wet-cooled stations and industrial sites, the cold end quietly erodes performance. Biofouling, scaling, corrosion and ash or mud deposits reduce condenser cleanliness, increase cooling-water temperatures and make TR / TTD unstable. Multiple chemicals are dosed, but their true impact on energy efficiency is often unclear.
TES exists to make this part of the system visible and manageable. By focusing on cooling-water and condenser performance, we help clients recover efficiency that is already sitting in their assets, without claiming to replace proper operations, maintenance or long-term capital projects.
Our work with Eskom and large energy users
Mexel®432 has prior Eskom technical engagement history, including RT&D evaluation at Kriel and a structured testing protocol pathway for Tutuka. We understand the realities of working on live stations: water-quality constraints, operational risk, safety, and the need to align with engineering, chemical services and station management.
Our goal is straightforward: help stations stabilise condenser performance, not replace maintenance or plant disciplines. TES is structured so that station teams, engineering and independent referees can see the same data and draw their own technical conclusions.
Evidence and verification timeline
TES is built on documented work using ASME PTC 12.2 heat-rate review concepts, independent referee options and structured verification. Key evidence points:
Kriel Power Station
Initial Mexel®432 application
First Eskom site where Mexel®432 was applied in cooling-water service. Station data indicated improved condenser performance during treatment period.
Verification Standard
ASME PTC 12.2 Aligned
Performance gains should be reviewed using ASME PTC 12.2-aligned methodology where station data supports it. Any fuel or CO₂ figure is a derived calculation, not a standalone product claim.
Independent Referee
Water Research Commission
The WRC can act as an independent referee for TES pilots, reviewing methodology and results under their established frameworks for water-treatment research.
IoT Infrastructure
Thingy:91X dosing skids
TES dosing skids based on Nordic's Thingy:91X platform installed at Tutuka, providing traceable dosing records linked to condenser performance data.
Emissions Methodology
Derived emissions review
Working with Brundtland Consulting, we can assess whether reviewed site data creates a credible basis for an emissions methodology.
ASME PTC 12.2-aligned heat-rate analysis can support documentation for later review under international (VCS) or South African (DFFE) frameworks, subject to project-specific validation.
Verified efficiency data → derived emissions estimate → project-specific methodology review
Strategic Engagement
JET & transition context
TES is positioned within the Just Energy Transition context as a practical efficiency intervention that can extend asset life and reduce emissions intensity.
Documentation including the TES Master Evidence Pack and engineering protocol is available for qualified enquiries.
Industrial cooling-water clients
Beyond power stations, many industrial sites depend on reliable cooling-water systems: mines, refineries, steel plants, and large processing facilities. They face the same underlying issues – biofilm, corrosion, scaling, solids – often with variable raw-water quality.
TES principles translate directly into these environments. We adapt the same Mexel®432 chemistry, dosing and data approach to the specific cooling loops and constraints of each plant, with the same emphasis on transparency and measurable results.
Talk to us
Is TES right for your station?
If you manage a wet-cooled unit or industrial cooling-water system, a short technical discussion is usually enough to see if there is a realistic path to efficiency recovery.