Chiller-Plant Pilot Economics: A Worked Screening Model for UAE, Oman and Saudi Arabia Facilities

A worked, source-based screening model for a chiller-plant efficiency pilot, using each country's own published electricity tariff and one illustrative scenario to show what a facilities team can and cannot conclude before committing capital.

Decision question

What electricity-tariff and cost evidence does a facilities or engineering decision-maker need before committing capital to a chiller-plant efficiency pilot, and how should a screening calculation be built from it in the UAE, Oman and Saudi Arabia?

Audience

Facilities director, head of engineering or asset manager deciding whether to fund a chiller-plant efficiency pilot in a commercial, hospitality or mixed-use building

Geography

UAE, Oman, Saudi Arabia

Sector

Commercial buildings, Hospitality, Facilities management

Theme

Buildings & Cooling

Series

BARZ Investment Decision Studies

Decision question and audience

A facilities director, head of engineering or asset manager weighing a chiller-plant efficiency pilot — variable-speed drives, control-sequence retuning, re-commissioning or a deeper retrofit — needs to know, before any site survey, what a kW/TR improvement is actually worth under the electricity tariff that applies to the building, and what a screening calculation built from published evidence can and cannot tell them. Electricity tariffs set the ceiling on that value, and the tariff structures in the UAE, Oman and Saudi Arabia are not interchangeable: Dubai prices commercial electricity on a four-step consumption slab, Oman splits non-residential customers between a flat retail rate and a separate Cost-Reflective Tariff once annual consumption passes a published threshold, and Saudi Arabia prices commercial consumption on a two-step slab that is itself about to change. This study sets out a worked screening model built from that published evidence for one illustrative pilot scenario, shows the method a decision-maker can re-run on their own numbers, and states plainly what still has to come from the site before a pilot is committed.

Executive summary

Dubai's commercial electricity tariff, Schedule 1 of Executive Council Resolution No. (16) of 2011, prices its top consumption slab at 38 fils/kWh (Dubai, DEWA) [1] — a Dubai, DEWA-specific figure, not a national UAE rate. Oman's standard non-residential tariff is 25 baisa/kWh [2]. A separate Cost-Reflective Tariff Regulation applies to non-residential subscribers whose annual consumption exceeds 100 MWh/year [2], which this study does not price, but the cited report does not itself state that the flat rate stops applying once a subscriber passes that threshold — this study treats that as a reasonable, but unconfirmed, reading of an ambiguous media report, not as an established rule, and marks it accordingly below. Saudi Arabia's commercial tariff for its top consumption slab is 32 halala/kWh [3] at this study's publication date, reported to rise to 35 halala/kWh [3] from 1 January 2027; Saudi Energy's own announcement of that adjustment, and its effective date, is also confirmed directly by the official Saudi Press Agency [4].

Applied to one illustrative, identical pilot scenario — a 50 TR chiller plant, specific power improved from an assumed 0.75 kW/TR baseline to 0.60 kW/TR (a 20 % reduction), sustained over a fixed annual equivalent full-load operating-hours assumption — this study's worked model gives an annual electricity-cost saving of 7,125 AED in Dubai, 468.8 OMR in Oman and 6,000 SAR in Saudi Arabia, each a separate calculation against that jurisdiction's own tariff and none derived from the others. Against an illustrative retrofit cost assumed independently for each country, in that country's own currency — not a quotation, not derived from one another, and not evidenced as a comparable scope or cost basis across the three markets — this model gives an illustrative simple payback of 4.21 year in Dubai, 17.07 year in Oman and 6.67 year in Saudi Arabia. These three figures are illustrative scenarios of one formula in which both the retrofit-cost assumption and the saving differ, and they are intentionally not compared against each other: doing so would attribute the difference to the tariff alone when part of it is an unverified cost assumption. None of this is a recommendation to proceed; it shows what published tariffs and one worked model can and cannot tell a decision-maker, and where metered site data has to take over.

Evidence and methodology

Sources used. The Dubai figure comes from Executive Council Resolution No. (16) of 2011, the Dubai regulation that approved the electricity tariff schedule shown in Schedule (1) of that document, read directly from the Dubai Legislation Portal's published English-language PDF [1]. The Oman figures come from Oman Observer's report of the Authority for Public Services Regulation's Approved Tariff Regulation and Cost-Reflective Tariff Regulation [2]. The Saudi Arabia rate figures — the rate in force at this study's publication date and the rate due to replace it — come from ARY News's report, attributed to Saudi Gazette, of Saudi Energy's revised tariff guide [3]; the adjustment's official status and its 1 January 2027 effective date are confirmed separately by the Saudi Press Agency's report of Saudi Energy's own statement [4], which does not itself state the halala-per-kWh figures. These gaps are recorded as limitations below, not concealed.

Scope of the scenario. All three jurisdictions publish several tariff bands or categories; this study uses, in each country, the top commercial consumption slab (Dubai, Saudi Arabia) or Oman's non-residential flat rate, which this study treats as not applying once a subscriber passes the Cost-Reflective Tariff Regulation's own published consumption threshold — an inference from an ambiguous media report, explained below, not a rule the report states outright. A chiller plant large enough to be a meaningful pilot can push a site's total annual electricity consumption toward or past that threshold at full load; Calculations below checks the illustrative scenario's own baseline consumption against it directly.

Engineering boundary. The 0.75 kW/TR baseline and 0.60 kW/TR improved figure used throughout are chiller-only specific power — electrical input to the chiller compressor per unit of cooling output (TR) — not a whole-plant figure. A whole-plant kW/TR, which also counts chilled-water and condenser-water pump power and cooling-tower fan power, is typically higher, and the same absolute kW/TR reduction would show a different percentage improvement on that basis; this study does not model the whole-plant case, because no verifiable source for auxiliary power at this illustrative scale was available within this update. "50 TR" is the plant's rated cooling output, not its electrical input. The annual equivalent full-load operating hours used in the calculations below, to convert a kW/TR improvement into an annual kWh figure, is likewise an assumption, not a measured operating pattern; a real site's equivalent full-load hours depend on its climate, schedule and part-load behaviour and should come from trend-log data before a pilot business case is finalised.

Avoided-cost method. Each country's saving is calculated only against the per-kWh, consumption-dependent charge that a tariff states — Dubai's top-slab energy rate, Oman's flat non-residential rate, and Saudi Arabia's top-slab commercial rate. None of the base calculations includes a demand (kW) charge, because a kW/TR efficiency improvement only reduces billable demand where a utility's demand charge is itself based on a peak the improvement actually lowers, and this study holds no site evidence that it does; it excludes standing or fixed charges, because those do not fall when consumption falls; and it excludes VAT, because whether VAT is a real cost to a given customer depends on that customer's own ability to recover input VAT, which this study cannot assume either way. A real site's full avoided-cost figure needs its own bill to confirm which components actually move with a reduction in kWh.

Calculations

The scenario held constant across all three countries, before any country-specific pricing: a 50 TR chiller plant and a fixed annual equivalent full-load operating-hours assumption (see the baseline calculation below). The efficiency improvement itself is a reduction of 20 % in the assumed chiller-only specific power:

On this baseline, the chiller plant alone would consume 93,750 kWh a year before the improvement — the figure this study checks against Oman's consumption threshold below:

Converted into an illustrative annual saving per TR, as shown in each calculation's own inputs below, and applied to each country's own tariff:

Against an illustrative retrofit cost assumed independently for each country, in that country's own currency — not a quotation, not derived from one another, and not evidenced as a comparable scope or cost basis — the resulting simple payback is:

These three payback figures are illustrative scenarios of one formula in which both the retrofit-cost assumption and the saving differ by country, so this study does not set them against each other as a cross-country comparison.

Alternative options

A capital-funded pilot is one of several ways to approach a chiller-plant question, and the published tariff evidence here does not by itself favour one over another. A no-capex option is to audit existing building-management-system trend data for the current kW/TR baseline and operating pattern before spending on anything, which directly supplies the inputs this study treated as assumptions. A low-capex option is operational tuning — control-sequence retuning, condenser and chilled-water setpoint review, coil and strainer cleaning, re-commissioning — which can recover some efficiency loss without the retrofit cost used in the calculations above. The retrofit scope modelled here (variable-speed drives and controls, an illustrative CAPEX order of magnitude) sits between that and a deeper option, full chiller replacement, which typically costs more per TR, takes longer to plan and deliver, and was not modelled because no verifiable public CAPEX source for it was available within this update. Doing nothing and continuing to monitor utility bills is also a legitimate choice in any of the three markets where that market's own illustrative payback, under its own tariff and retrofit-cost assumption, does not yet justify committing capital.

Scenarios and sensitivity

The efficiency-improvement assumption is the input each country's saving is most sensitive to, because it scales the result directly. Holding plant capacity, operating hours and each country's own tariff unchanged, an illustrative low case and high case — two-thirds and four-thirds of the base-case efficiency improvement, each stated in its own calculation below — move the annual saving as follows:

A lower saving lengthens each country's own illustrative payback and a higher saving shortens it, in the same proportion; this study does not restate the payback figure at the low and high case, since the payback calculations above already show the method for any saving figure. Three further sensitivities follow from the evidence rather than from this arithmetic. First, scale: 93,750 kWh is this illustrative plant's own consumption; a larger plant, or the same plant sharing a meter with other loads, can push the account's total annual consumption past 100 MWh/year [2], above which the Cost-Reflective Tariff Regulation applies in its own right — and which this study, as a cautious reading of an ambiguous report, treats as the point past which the flat rate used here should no longer be assumed to apply — so the Oman figures here should not be extrapolated to a full building or portfolio rollout. Second, each country's retrofit-cost assumption was chosen independently in that country's own currency and is not derived from one another, from any currency conversion, or from a shared cost basis; a real quotation that differs materially from the assumption used here would change that country's own payback in the same proportion, without affecting the other two countries' figures. Third, the Saudi Arabia tariff used above is the rate in force at this study's publication date; 35 halala/kWh [3] is reported to apply from 1 January 2027, a date the Saudi Press Agency also confirms [4], within two months of publication — recalculating 6,000 SAR at that rate instead would raise the Saudi Arabia saving and shorten its illustrative payback.

Limitations and missing data

The Oman and Saudi Arabia tariff figures are drawn from media reports of regulatory or company decisions, not from the regulator's or operator's own published tariff pages, for the reasons given in Evidence and methodology above. The Saudi revision is additionally confirmed, as to its official status and 1 January 2027 effective date, by the Saudi Press Agency's report of Saudi Energy's own statement [4], though that report does not itself state the halala-per-kWh figures used in the calculations above. The Dubai figure rests on a 2011 resolution; no later consolidating Dubai resolution covering the slab rates themselves was located. This study does not price DEWA's separate monthly fuel surcharge: the only figure found for it came from a commercial billing explainer that could not be confirmed as a directly citable source, so it is left out rather than published unverified, and a real Dubai account's bill will be higher than the Dubai figures shown above by that surcharge. The exact boundary between Oman's flat non-residential rate and its Cost-Reflective Tariff Regulation above 100 MWh/year [2] is, on the evidence available, this study's own inference from an ambiguous report rather than a rule the report states outright; APSR's own regulation text, if located, could confirm or correct it. None of the base calculations include demand charges, standing charges or VAT, for the reasons given in Evidence and methodology above; a real site's bill would carry some or all of them. The plant capacity, efficiency improvement, baseline specific power, operating hours and retrofit cost are stated illustrative assumptions, not measurements from any specific building; a real pilot's economics depend on its own metered baseline kW/TR, its actual equivalent full-load hours, its actual total account consumption, and an actual contractor quotation, none of which this desk holds.

What would change the conclusion

Each country's own figures would change on evidence this study does not yet hold. Oman's conclusion changes if the Cost-Reflective Tariff rate, once priced, turns out to be materially higher per kWh than the flat non-residential rate used here; if the account's total consumption — not only this illustrative chiller plant's own consumption — turns out to exceed 100 MWh/year [2]; or if APSR's own regulation text turns out to state the boundary between the two tariffs differently from this study's own reading of an ambiguous media report. Dubai's figure would change with a VAT-recovery position specific to the customer, and would rise further once a directly citable source for DEWA's monthly fuel surcharge is found and priced. Saudi Arabia's conclusion changes on an already-reported, officially confirmed date: 35 halala/kWh [3] is reported to apply from 1 January 2027, confirmed by the Saudi Press Agency [4], under two months after this study's publication date, and would raise 6,000 SAR and shorten the Saudi Arabia payback once it takes effect; this study is scheduled to recheck the Saudi Arabia figures before that date. Any of the three countries' illustrative payback figures would also change materially if the retrofit-cost assumption used for that country is replaced by a real, scoped quotation.

Practical next steps

Before committing capital to a pilot, a decision-maker in any of the three markets should: pull the building's actual metered annual electricity consumption and compare it against Oman's 100 MWh/year [2] threshold where relevant, since Calculations above shows this cannot be judged from the chiller plant's own consumption alone; obtain the building's own baseline kW/TR, on a chiller-only and a whole-plant basis, from commissioning or trend-log data rather than relying on an assumed efficiency improvement; request a scoped, dated retrofit quotation rather than an illustrative CAPEX figure; and add the relevant demand charges, standing charges and VAT position to any tariff figure, following the method set out in Evidence and methodology, before using it to size a business case. A decision-maker in Saudi Arabia should additionally confirm whether a pilot's business case is being built against the tariff in force now or the one due from 1 January 2027, since the two give different savings and paybacks; a decision-maker in Dubai should confirm the current fuel-surcharge rate directly with DEWA, since this study does not price it.

Sources

1. Executive Council Resolution No. (16) of 2011 Approving the Electricity and Water Tariff in the Emirate of Dubai
2. New electricity tariffs come into effect on Wednesday — Oman Observer
3. Saudi Arabia announces new electricity, water and wastewater charges — ARY News
4. Saudi Energy Announces Electricity Service Tariff Adjustment from January 1, 2027 — Saudi Press Agency