The homepage gives the summary. This page keeps the portfolio totals, site context, before-and-after kW/RT charts and sustained operating bands in one place.
Use this page after the homepage summary. If you need names or raw M&V records, move to credentials.
Savings accrue for as long as a plant runs, so these count every project from its own day one through June 2026, including the two we have since divested. We built the efficiency; the kilowatt-hours keep being saved. Individual sites stay unnamed. That is our clients' business, not our marketing.
Metered against baselines fixed before works began, in the manner of IPMVP Option C, to 30 June 2026, including plants since divested. Carbon at the Energy Commission's published Grid Emission Factor for Peninsular Malaysia, matched to each year's savings.
Cumulative kWh saved per plant, each counted from its own first day of operation to 30 June 2026, including the two plants since divested. Sites are shown by building type and state.
Efficiency is kilowatts drawn per ton of cooling delivered, or kW/RT. Lower is better. Each plant shows its best verified month, with the sustained band it has actually held printed underneath, because a peak figure without a range is worth nothing. These are our own commissioned plants, presented by building type. We do not publish client identities or their consumption data, and we would extend you the same courtesy.
A fully occupied headquarters tower in Kuala Lumpur. Central chiller plant plus 25 air handling units, all retrofitted around a working building that could never go dark. Five years on, the plant still holds its commissioning efficiency, which is the number most retrofits quietly lose by year three.
Whole air-conditioning system efficiency, against a fixed pre-retrofit baseline. Best verified month; the plant has held a 0.69–0.74 kW/RT band continuously since commissioning, with no measured drift.
A four-star hotel and the mall beside it, on the east coast, integrated into one 1,000-ton centralised plant serving both. Two buildings with completely different load patterns, a hotel that never sleeps and a mall that empties at nine, balanced on a single system.
Chiller-plant efficiency. Best verified month; the plant ran 0.535–0.653 kW/RT across eight consecutive monthly verification reports in its first full operating year.
A hypermarket in Melaka where cooling runs every hour the doors are open. Susten designed and built the comfort-cooling plant, a single 500 RT chiller serving around 54 fan coil units across the shop floor. Delivered as Cooling-as-a-Service: an investor funded and owns the plant, the operator pays only for cooling delivered, and Susten runs the energy management against a contractual efficiency guarantee. Live since 2023 and still improving.
Chiller-plant efficiency against the 1.1–1.2 kW/RT benchmark typical of comparable retail premises. Best verified month; the plant ran 0.519–0.543 kW/RT through the first half of 2026, improving year on year since 2023.
Two adjacent buildings in George Town, Penang running two separate plants, combined into a single centralised and optimised system with six custom-built chillers. Technically the hardest thing we do. The completed asset was subsequently acquired by an institutional energy infrastructure owner, with Susten retained as energy manager.
Whole air-conditioning system efficiency. Best verified month; the plant ran 0.76–0.79 kW/RT across the most recent reporting period, saving 44–50% against baseline.
A chiller plant is a chain, and the waste hides in the links between equipment. We meter the whole chain and feed it to our own platform. That is how a five-year-old retrofit still performs like a new one.
Thousands of sensors per site across chillers, pumps, cooling towers, air handling units and fan coil units. Every reading lands in our platform, where equipment drifting outside normal parameters is flagged for inspection before it becomes a fault.
Anyone can report a reduction by choosing a flattering starting point. These are the rules we hold ourselves to, including the two occasions they cost us something.
Every plant is measured against its own pre-retrofit condition, established by audit before anything is touched. We do not move the baseline forward to a later year, which is the most common way a reported saving quietly inflates.
Savings are settled on metered data, not on modelled estimates, and reported every month for the life of the contract. Our oldest plant has six unbroken years of it. Where we are paid a share of savings, this is the same data the payment is calculated from.
Each year of savings is multiplied by the Energy Commission's published Grid Emission Factor for Peninsular Malaysia for that year, rather than by a single convenient average. The factor moves, so the conversion moves with it.
We restated our own carbon figure upward, and withdrew a number we had published. An earlier conversion used a single emission factor that matched no published source and understated the portfolio by around 55%. Correcting it raised the reported figure, which is the direction a company has no incentive to move in. At the same time we withdrew a trees-equivalent figure we had been publishing: it represented one year of absorption but was captioned as a standing forest, so it read as more than it was. It is not coming back.
On one building we narrowed the measurement boundary rather than restate the baseline. An office tower we retrofitted later converted several floors to a data centre. That load lands on the same incoming meter but has nothing to do with the cooling plant, so a whole-building comparison had started to understate the plant's performance. Rather than re-base the baseline, which would have broken our own rule, we narrowed the boundary to the air-conditioning system and kept the original pre-retrofit efficiency as the reference. The plant itself shows no measured degradation.
