Eskom Homeflex vs Homepower in 2026/27: which tariff gives the lower bill?

Answer first: Homepower is the simple tariff: one energy rate all day, every day. Homeflex is the time-of-use tariff: cheap at night and on weekends, standard through the day, very expensive in the five weekday peak hours — especially in winter. Pair Homeflex with solar and a battery and it is the cheapest residential tariff Eskom sells. Without a battery, it punishes you in winter. Related: Homeflex and solar · Homeflex Gen-offset export credits · Homelight vs solar.

The 2026/27 rates, all-in

Eskom raised all residential tariffs by 8.76% from 1 April 2026 and moved more of the service and administration charge into the fixed daily line — 66.6% fixed, up from 33.3% — lowering energy rates to compensate (Eskom 2026/27 tariff increase page; Eskom Tariffs and Charges Booklet 2026/27). To compare fairly you have to add the per-kWh extras to the energy rate. For non-local-authority supply, incl. VAT:

Fixed charges are identical on both tariffs for the same supply size. Size 1 (dual-phase 32 kVA or three-phase 25 kVA): network capacity R15.17 + service and administration R6.60 + generation capacity R1.25 = R23.02 a day incl. VAT, about R700 a month. Size 4 (single-phase 16 kVA, 80 A): R10.44 + R6.60 + R0.82 = R17.86 a day, about R543 a month (Eskom Tariffs and Charges Booklet 2026/27).

When the peak hours fall

Homeflex uses the same time-of-use periods as Megaflex and Ruraflex (Eskom booklet Appendix A; GridPulse ZA time-of-use table):

• June–August: weekday peak 06:00–08:00 and 17:00–20:00; standard 08:00–17:00 and 20:00–22:00.
• September–May: weekday peak 07:00–09:00 and 18:00–21:00; standard 06:00–07:00, 09:00–18:00 and 21:00–22:00.
• Weekends: no peak; a two-hour Sunday evening standard window; everything else is off-peak.

That is five peak hours per weekday — about 110 hours a month out of roughly 730. The evening block lines up exactly with cooking, geysers and TV, which is why households without storage struggle on Homeflex.

A 900 kWh household with no solar

Assume a common evening-heavy pattern: 20% of kWh in peak, 45% in standard, 35% in off-peak.

• Homepower, any month: 900 × 355.56 c = R3 200 energy + R700 fixed = ≈R3 900.
• Homeflex, September–May: weighted 318.2 c/kWh → R2 864 energy + R700 = ≈R3 564 (R336 less).
• Homeflex, June–August: weighted 414.9 c/kWh → R3 734 energy + R700 = ≈R4 434 (R534 more).

Over a year Homeflex averages about 342 c/kWh in this pattern, around R119 a month cheaper than Homepower — but three winter months cost noticeably more. A household that cannot move its evening load should stay on Homepower until it adds storage.

The same household with solar and a battery on Homeflex

Add a 5–6 kW hybrid inverter, about 6 kWp of panels and a 16 kWh battery. Panels cover roughly 450 kWh of daytime standard-period use each month; the battery delivers about 180 kWh a month (≈8 kWh per weekday) through the peak windows. What is left on the grid — about 270 kWh — falls mostly at night and on weekends at the 252.83 c off-peak rate:

• 270 kWh × 252.83 c = R683 energy + R700 fixed = ≈R1 383 a month.
• Against the R3 900 Homepower bill with no solar, that is about R2 517 a month saved, roughly R30 200 a year, before any Gen-offset export credit.

The battery is the part that makes Homeflex pay. Each winter-peak kWh it supplies is worth ≈909 c; each summer-peak kWh ≈457 c. That is why the sweet spot for Eskom-direct homes is a 16 kWh expandable battery on a 48 V DC bus: enough usable kWh to cover the full evening peak plus a reserve. Field installers say Solar MD packs outlive their warranty, which matters on a tariff where the battery cycles every weekday — battery sizing · battery guide.

Why grid-tied solar forces the choice

Eskom’s booklet is explicit: for grid-tied generation a TOU tariff is mandatory, and Homepower is offered only to supplies without grid-tied generation (Eskom Tariffs and Charges Booklet 2026/27). Homeflex customers can also earn Gen-offset credits on exported energy, capped per TOU period at what they consumed in that period — Gen-offset explained. A backup-only inverter with no grid-tie, or an off-grid system, is the only route that keeps you on Homepower, and it gives up the export credit.

Switching checklist

1. Pull 12 months of Eskom bills and note your supply size (Homepower 1–4) — how to read an Eskom bill.
2. Program the inverter to hold battery for the peak windows above, not for midnight.
3. Move the geyser timer to the solar window (10:00–15:00) — smart geyser timer.
4. Charge any EV off-peak or from midday solar — TOU and EV charging.
5. Apply for Homeflex together with your SSEG application so the meter and the tariff change on the same visit.

Adding an EV makes Homeflex stronger

An electric car driven 1 500 km a month at about 16 kWh per 100 km, plus 10% charging losses, needs about 264 kWh. Charged overnight on Homeflex off-peak at about 252.83 c/kWh all-in incl. VAT, that costs about R667 a month. The same kWh on Homepower at about 355.56 c all-in cost about R939 — so the car alone is worth about R271 a month, or R3 250 a year, in favour of Homeflex. Set the charger’s schedule to start after 22:00 and finish before the morning peak, and let daytime solar top up at weekends — TOU and EV charging · what it costs to charge an EV.

Bottom line

Without storage, Homepower is the safer bill and Homeflex costs more every winter. With solar and a 16 kWh battery that covers the weekday peak, Homeflex is the cheapest Eskom residential tariff by a wide margin — about R2 500 a month off a 900 kWh household in our worked example — and it is the tariff Eskom requires once you grid-tie.

Quick questions

Is Homeflex cheaper than Homepower?

Only if you stay off the peak. Homeflex off-peak energy costs about 252.8 c/kWh all-in incl. VAT against Homepower’s flat 355.6 c, but its winter peak costs about 909.1 c. Households with a battery that covers the weekday peak pay less on Homeflex; households without one pay more in June, July and August.

Do I have to move to Homeflex if I install solar?

Yes, if the system is grid-tied. Eskom’s 2026/27 tariff booklet states that a time-of-use tariff is mandatory for grid-tied generation, and Homeflex is the residential TOU tariff. Homeflex also carries the Gen-offset credit for exported energy.

What are the Homeflex peak hours?

Weekdays 06:00–08:00 and 17:00–20:00 from June to August, and 07:00–09:00 and 18:00–21:00 from September to May. Weekends have no peak period.

Are the fixed charges different?

No. For the same supply size the daily network capacity, service and administration, and generation capacity charges are identical — about R23.02 a day incl. VAT for size 1, roughly R700 a month.