El Niño may intensify warm spells in Mauritius. It does not set CEB tariffs, but it can extend air-conditioning use, increase billed volumes and concentrate demand at the tightest time of day: the evening.
Analysis updated in August 2026 from NOAA, MMS, WMO, CEB and Statistics Mauritius sources.
El Niño is a seasonal tendency, not a day-by-day local forecast. Sources agree on more frequent heat risk, but the exact intensity and rainfall pattern in Mauritius remain influenced by other Indian Ocean drivers.
The historical average during major El Niño events and the current forecast are different statements. The figures below were published by MMS on 10 August 2026.
| Month | Expected rainfall | % of normal | Status |
|---|---|---|---|
| August | 85 mm | 80 % | Slightly below normal |
| September | 70 mm | 80 % | Slightly below normal |
| October | 60 mm | 80 % | Slightly below normal |
| November | 75 mm | 90 % | Normal |
The climate phenomenon does not act alone. It amplifies a sequence of constraints already present in an island grid.
Above-normal temperatures and more frequent warm spells.
Air conditioners, fans and refrigeration run for longer.
Load concentrates after sunset, between 6 pm and 9 pm.
One generation outage can be enough to bring supply and demand close together.
Three states are compared: your current use, a normal summer with cooling, then an El Niño summer with additional cooling hours. The El Niño impact is only the difference between the last two.
Set the number of units and their actual operating time.
The El Niño impact excludes usual air conditioning: it measures only the additional hours entered in scenario 3. Indicative estimate with default parameters.
This regime is not generalised to all households. It shows what the selected hourly distribution would produce if tariff 150D applied.
This reference covers up to 24 kWh/day with a 24 kWh battery. Indicative rent: Rs 4,000 incl. tax/month, contractually capped at +6%/year.
Estimated variable value excluding fixed charges, limited by your need and the indicative offer. This amount is not a guaranteed saving.
The sector preloads an understandable typical situation: number of cooled rooms, guest rooms or zones, operating time and peak share. Every value remains adjustable.
Change this only if you know the average electrical power of your cooling appliances or installations.
The El Niño impact excludes usual air conditioning: it measures only the additional hours entered in scenario 3. Indicative estimate with default parameters.
What the selected hourly distribution would produce if the commercial peak tariff were applied to your bill.
Pre-sizing within the Office sector only: 42 kWh/day, 42 kWh battery, indicative rent Rs 6,000 excl. VAT/month, capped at +6%/year.
Estimated variable value excluding fixed charges, limited by your need and the indicative offer. This amount is not a guaranteed saving.
Comparison limited to your sector, around the calculated El Niño need. Amounts remain indicative pending a technical visit.
On 5 February 2025, the CEB recorded an all-time demand peak of 567.9 MW at 9 pm, citing extreme weather among the drivers. At that hour photovoltaic output is zero: the battery, not only the panel, becomes the decisive asset.
At home, the evening return concentrates cooling, cooking, hot water and lighting. In hotels, shops, restaurants and supermarkets, refrigeration and customer comfort cannot simply be postponed until after 9 pm.
Heat forces you to consume when the grid has its narrowest reserve margin.
Teaching assumption: each air conditioner operates simultaneously at an average 1 kW. The percentage is measured against the official 567.9 MW record.
CEB, 5 February 2025 · grid incident, 3 October 2025
Meteorological services expect slightly below-normal rainfall from August to October 2026. They also stress that the IOD, SIOD and other regional drivers can modify El Niño’s effects over Mauritius.
Ten hydropower plants provide about 4% of electricity. A dry spell does not automatically stop the dams; it exposes a local, dispatchable margin when every megawatt matters.
A peak must be covered in Mauritius by the units available at that moment. When solar output declines and demand rises, the CEB calls on dispatchable generation — including Jet A1 turbines used mainly during peak periods.
of electricity generated in 2025 came from non-renewable sources
of primary energy requirements depended on imported fuels
used by CEB turbines mainly during peak periods
When demand rises and water becomes scarcer, every local megawatt becomes more valuable.
Without storage, photovoltaic generation declines before the grid’s tightest period. A battery shifts part of daytime solar energy into the 6 pm–9 pm window.
The calculator separates the ToU scenario from the El Niño effect. The former changes prices by hour; the latter may increase air-conditioning hours. The two effects must never be conflated.
On an isolated grid, shifting demand costs less than building a power plant used only a few hours a day.
A hotel cannot close its kitchen at 7 pm. A supermarket cannot interrupt its cold chain. A family cannot always postpone cooking, showers and thermal comfort. Storage shifts energy instead of constraining daily life.
Heat increases evening consumption and can push extra kilowatt-hours into the highest tariff blocks. Use in the evening part of the energy produced at home during the day.
View 10 residential solutionsYour peak can coincide with the moment your customers demand the most service. Protect refrigeration, comfort and continuity without moving your activity.
View 60 business solutionsSolar Rent sizes generation, storage and priority circuits from your actual consumption and continuity objective.
Climate, electricity and tariff facts are separated from scenarios. CEB rules may evolve; this page will be updated as official decisions are made.
