How DEWA's electricity slabs work, and why your last kWh costs 65% more than your first

Your DEWA bill is not priced at one flat rate. Dubai homes are charged through four consumption slabs (Green, Yellow, Orange and Red), and the price climbs as you use more. The first unit you use each month costs 23 fils per kWh. Once you pass 6,000 kWh, every further unit costs 38 fils, 65% more than the first. Understanding how DEWA's electricity slabs work tells you two things: what your air conditioning really costs in August, and why solar savings are bigger than the average rate on your bill suggests.

The four residential bands, side by side

DEWA, the Dubai Electricity and Water Authority, walks your monthly consumption through the bands in order. Each band prices only the units that fall inside it, so moving into a higher band never re-prices the units below it. The count resets every month.

On top of the band rates, a fuel surcharge applies to every unit, whatever band it falls in. It varies month to month; a recent, conservative value is around 6 fils per kWh, and that is the figure used in the examples below. Always check your latest bill for the current surcharge.

A worked example: the AED 920 villa bill

Take a home using 3,000 kWh a month, typical for a four-bedroom detached villa where air conditioning does most of the work. The bill builds in layers:

Two rates come out of this, and they are not the same. The blended rate (AED 920 spread across 3,000 units) is about 30.7 fils per kWh. The marginal rate (what the next unit costs) is 34 fils: the Yellow band plus fuel. Every extra hour of cooling this villa runs is billed at the marginal rate, not the average. That distinction decides what solar is worth.

Why your last kWh is the one to care about

Solar does not shave a little off every unit. Whatever your panels generate is consumption you no longer buy, and DEWA's slab structure means the units you stop buying are the ones at the top of the ladder. If the villa above installed a system covering 1,000 kWh a month, it would erase the whole Yellow layer of the bill: 1,000 units at 28 fils plus 6 fils fuel, or roughly AED 340 a month off a AED 920 bill.

Figures are estimates, not a quote. Final numbers depend on a site survey and DEWA approval.

The same logic scales. A large villa deep in the Orange or Red band saves 32 to 38 fils plus fuel on every displaced unit. A small, efficient home that never leaves Green saves 23 fils plus fuel. Same panels, same sunshine, very different returns, which is why any serious estimate starts from your consumption, not from the hardware. The sixty-second savings calculator does exactly that, working band by band from your bill or bedroom count.

Bands move with the seasons

The slabs reset monthly, and Dubai consumption does not stay still. The same villa can sit in Yellow through January and push into Orange or Red from June to September, when cooling load peaks. The summer months therefore contribute a disproportionate share of the annual bill, and they are also the months when solar output is strongest. The expensive electricity and the strong generation arrive together, which is one of the quiet advantages of solar in this city.

Why DEWA prices this way

Slab tariffs are a deliberate efficiency signal: light users pay less per unit, heavy users pay progressively more. The structure sits alongside Dubai's wider energy policy (the Shams Dubai rooftop programme and the UAE Net Zero 2050 strategy), which rewards anyone who reduces what they draw from the grid. Rooftop solar is the direct response: it turns the pricing penalty on heavy consumption into a saving, unit by unit.

Businesses: the same logic, two slabs

Commercial premises are billed on a simpler ladder: 23 fils per kWh up to 10,000 kWh a month and 38 fils on everything above it, with the same fuel surcharge on each unit. An office or warehouse drawing 20,000 kWh a month buys half of its electricity at the top rate, and solar removes those units first. The worked warehouse example in our payback guide for buyers shows what that does to the return on a commercial roof.

For what a system to cut these bands costs, see our solar panel price guide for Dubai.

Reading your own bill: a short checklist

• Find the monthly kWh figure on your DEWA bill: the consumption in units, not the AED total.
• Under 2,000 kWh: you stay in Green. Solar still works, but the sums are modest.
• 2,001–4,000 kWh: your top units cost 34 fils all-in. Most Dubai villas and larger townhouses sit here.
• 4,001–6,000 kWh: Orange territory; 38 fils all-in at the margin. The case for solar is strong.
• Above 6,000 kWh: every marginal unit costs 44 fils all-in. This is where paybacks are shortest.
• Compare a summer bill with a winter one; the gap tells you how much of your cost is cooling.

From here there are two ways to act on it. If you have capital, buying a system outright captures the whole saving and typically pays back in a handful of years. If you would rather commit nothing upfront, a solar PPA at AED 0 upfront hands the cost and the maintenance to a provider while still cutting the bill. Either way, the grid connection runs through DEWA's Shams Dubai programme; our step-by-step Shams Dubai guide explains the approvals.