Money & tariffs

How do TOU and prepaid meters change EV charging (and solar export) in South Africa?

Meter class decides whether overnight charging is cheap, whether your hybrid can export, and whether City Power will make you leave prepaid. Self-use into the wallbox still beats thin feed-in credits.

Updated 26 October 2026 · Tariffs quoted are the 2026/27 municipal year (from 1 July 2026) unless stated.

Answer first: Your meter type decides whether solar export and overnight EV charging are cheap, awkward or blocked. Self-use of PV into the wallbox still beats exporting at thin credits then buying grid later. Where you have true TOU off-peak, use it for night fills; where you are prepaid, budget for possible meter/tariff migration before hybrid export — especially under City Power.

Three meter stories that change EV maths

SetupEV charging tipSolar export tip
Inclining-block / flat prepaidEvery grid kWh into the car costs the block you are in — high users pay the expensive stepsMany metros will not leave a dumb prepaid token meter on an exporting hybrid; ask before install
TOU conventional (postpaid)Schedule the wallbox for off-peak; still prefer daytime PV when homeOften the path metros want for bidirectional SSEG meters
SSEG / net-billing tariffTreat export credit as Plan B; Plan A is car + geyser on surplusUse published c/kWh credits below — never invent

2026/27 export credits (primary-sourced) — why EV self-use wins

Full citations live on solar feed-in tariffs. Incl. ~15% VAT:

  • Cape Town Home User SSEG — ~152.93 c/kWh incl. (107.98 feed-in + 25.00 incentive excl., then VAT)
  • City Power (Johannesburg) residential embedded gen — 124.60 c excl. / ~143.29 c incl.; prepaid SSEG must migrate to TOU conventional; net-consumer; ≤1 MW; bi-directional meter
  • City of Tshwane credit reverse — 94.13 c excl. / ~108.25 c incl. plus Domestic SSEG fixed ~R372.60/mo incl.; City FAQ may still show old 11.99 c — trust the NERSA RfD / your statement
  • eThekwini residential net-billing — 160.52 c excl. / ~184.60 c incl.; network access ~R88.35/kVA/mo incl. of inverter; credits reduce the account (not cash)

Retail import is commonly ~R3.30–R4.70/kWh energy. Pushing PV into a Type 2 wallbox avoids the full retail rate; exporting then re-importing overnight destroys the spread.

City Power prepaid → TOU (Joburg edge case)

If you want registered export on City Power, plan the tariff migration into the project: residential exporters must sit on a time-of-use conventional tariff (ITEM-76 / Annexure A1 conditions). That changes fixed/service charges and how you schedule the EV. Do not assume your existing prepaid token meter will accept reverse power. Related: prepaid + solar.

Cape Town, Tshwane, eThekwini — EV scheduling notes

  • Cape Town: Strong case for daytime solar charging; feed-in incentive helps leftovers but still below retail. AMI / Home User rules apply — verify on the City schedule linked from the feed-in page.
  • Tshwane: Model the Domestic SSEG fixed line every month before you celebrate export cents. Confirm the live credit on your bidirectional statement (FAQ lag warning above).
  • eThekwini: Oversize the inverter and you pay network access every month on kVA whether the EV needs it or not. Size continuous power for house + heat pump + wallbox carefully.

Practical wallbox settings

  1. Solar-surplus or “eco” mode when you work from home.
  2. TOU off-peak schedule when the car sits overnight and PV is gone.
  3. Hard amperage cap shared with geyser/oven — load management.
  4. Never park the EV on a small essential-loads battery bus.

Hardware starting point with local support: SAEV Charge — people’s favourite among peers we compare; Richmond public DC evidence ~R3.49/kWh vs GridCars ~R7.35 (DriveElectric).

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