How Many Units Is R25 Electricity in South Africa?

R25 of prepaid electricity in South Africa

6 - 9.2 kWh

City of Cape Town (lowest) to Eskom Homelight 20A (highest)

On Eskom direct supply at R2.49/kWh you get 9.2 kWh (lasts ~0.9 days at typical 10 kWh/day household use).⚠ Worst case: as little as 5.1 kWh if your purchase lands in a punitive top block (e.g. Ekurhuleni above 700 kWh/month at R11.99/kWh). See why below.

R25 of prepaid electricity in South Africa buys you anywhere from 6 kWh (most expensive first-block muni: City of Cape Town) to 9.2 kWh (cheapest: Eskom direct supply at R2.49/kWh). That's the headline range - but block stacking on inclining tariffs can push the worst-case down to 5.1 kWh for the same R25 late in the billing month. Pick your provider in the calculator below for the precise number.

R25 Electricity by Provider (2025/2026)

Estimate: Block tariffs depend on how much you have already bought this month. These figures assume a first top-up in the billing month. Municipal block tariffs are estimated as if this is the first purchase in the billing month. Actual tokens can differ later in the month.

Provider	Avg R/kWh*	Units (kWh)	Est. Days
Eskom Homelight 20A	R2.71/kWh	9.2 kWh	0.9 days
Eskom Homelight 60A	R3.44/kWh	7.3 kWh	0.7 days
City Power (Johannesburg)	R3.33/kWh R3.33-R4.35/kWh steps	7.5 kWh	0.8 days
City of Cape Town	R4.14/kWh R4.14-R4.94/kWh steps	6 kWh	0.6 days
City of Tshwane (Pretoria)	R3.42/kWh R3.42-R4.70/kWh steps	7.3 kWh	0.7 days
eThekwini (Durban)	R4.11/kWh	6.1 kWh	0.6 days
Ekurhuleni	R3.52/kWh	7.1 kWh	0.7 days

* Average R/kWh = R25 ÷ kWh for this purchase. Days at 10 kWh/day average usage.

Your exact scenario

Pick your provider and how much you have already bought this month

ProviderAlready bought this month

On Eskom Homelight 20A, first purchase this month (block 1), R25 buys

9.2 kWh

at R2.71/kWh, lasts ~0.9 days at typical 10 kWh/day household use

Block boundaries shown are kWh thresholds for the current calendar month - they reset on the 1st. Eskom Homelight and eThekwini Durban use a single flat rate, so the block selector is disabled for those.

Why R25 can buy 50%+ fewer units later in the month

Most municipalities reset block tariffs on the 1st of the month. Your first R25 top-up is on the cheapest block. As your monthly consumption climbs, every new purchase rolls into a more expensive block. The same R25 can buy half the units (or worse) by the end of the month - this is the single biggest reason households see wildly different totals on the same Rand amount.

How to read this: Each bar shows how many kWh R25 buys in that block. As you spend more in a billing month, your purchases roll into the next block and you get fewer kWh per Rand. The drop on the right is from Block 1 to the top block.

City Power (Johannesburg)

R25 buys 24% fewer kWh in the top block

First 350 kWh7.5 kWhR3.33/kWh
351 - 500 kWh6.5 kWhR3.82/kWh
Above 500 kWh5.7 kWhR4.35/kWh

City of Cape Town

R25 buys 15% fewer kWh in the top block

First 600 kWh6 kWhR4.14/kWh
Above 600 kWh5.1 kWhR4.94/kWh

City of Tshwane (Pretoria)

R25 buys 27% fewer kWh in the top block

First 100 kWh7.3 kWhR3.42/kWh
101 - 400 kWh6.3 kWhR4.00/kWh
401 - 650 kWh5.7 kWhR4.36/kWh
Above 650 kWh5.3 kWhR4.70/kWh

No block stacking on these providers: Eskom Homelight 20A stays at R2.71/kWh (9.2 kWh per R25); Eskom Homelight 60A stays at R3.44/kWh (7.3 kWh per R25); eThekwini (Durban) stays at R4.11/kWh (6.1 kWh per R25); Ekurhuleni stays at R3.52/kWh (7.1 kWh per R25). Your purchase position in the month does not change the rate.

Why does R25 buy 6 kWh in one place and 9.2 kWh in another? Seven things change the answer: your municipality, tariff code, inclining block tariffs, fixed monthly charges (City Power adds R200/month), the channel you buy through (Shoprite charges 1.3%), sub-meter resellers, and whether your account is in arrears. Read the full guide.

Rates have risen sharply. Eskom's regulated tariff is up roughly 115% since 2020 and over 16x what it was in 2000. The same R25 bought far more units a few years ago. See the full Eskom tariff history.

Frequently Asked Questions

How many units of electricity do you get for R25?

R25 buys roughly 6 to 9.2 kWh in South Africa, depending on your provider. Eskom Homelight direct supply at the flat rate of R2.49/kWh is cheapest at 9.2 kWh. City Power Johannesburg gives about 7.5 kWh, City of Cape Town Domestic about 6 kWh, eThekwini Durban a flat 6.1 kWh, and Tshwane around 7.3 kWh for a first-in-month purchase. The wide range exists because each municipality sets its own tariff, several use inclining block (IBT) rates that step up as you buy more in a billing month, and some add fixed monthly service charges (City Power adds R200/month) that effectively raise the cost per unit.

How long will R25 electricity last?

At a typical urban household usage of 10 kWh per day, R25 of Eskom electricity (9.2 kWh) will last approximately 0.9 days. Low-use rural households (3-5 kWh/day) can stretch it to 2 days, while high-use homes with electric geysers and pool pumps (around 18-20 kWh/day) typically work through it in 1 day.

How much is 1 unit of prepaid electricity in South Africa?

On Eskom Homelight (2025/2026), 1 unit costs R2.49 on the 20A tariff. Municipal rates vary: City Power Joburg prepaid high is about R3.06/kWh on the first 350 kWh of the month (VAT-inclusive energy estimate), Cape Town Domestic about R3.91/kWh on the first 600 kWh, Tshwane R3.42/kWh on the first 100 kWh stepping up to R4.70/kWh above 650 kWh, Durban (eThekwini) is a flat R3.77/kWh, and Ekurhuleni Tariff A2 is R2.97/kWh on the first 600 kWh stepping up sharply above. All VAT-inclusive energy-only estimates. For block tariffs, the rate you actually pay depends on how much you already bought this month.

Check Other Amounts

R51.9 kWh R103.7 kWh R155.5 kWh R207.4 kWh R3011.1 kWh R4014.8 kWh R5018.5 kWh R6022.1 kWh R7025.8 kWh R8029.5 kWh R9033.2 kWh R10036.9 kWh R11040.6 kWh R12546.1 kWh R15055.4 kWh R17564.6 kWh R20073.8 kWh R22583 kWh R25092.3 kWh R275101.5 kWh R300110.7 kWh R350129.2 kWh R400147.6 kWh R450166.1 kWh R500184.5 kWh R600221.4 kWh R700258.3 kWh R750276.8 kWh R800295.2 kWh R900332.1 kWh R1000369 kWh R1500553.5 kWh R2000738 kWh

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