Solar in South Africa: The Load-Shedding and Eskom Guide

Load-shedding has eased since the 2023 peak, but tariffs keep climbing. Here is how to design a solar or battery system that makes sense in 2026, with the sizing maths shown.

South Africa's solar boom was born out of necessity. Through 2022 and 2023, rolling blackouts reached record levels and households installed panels and batteries at an extraordinary rate. By 2026 the picture has changed: Eskom went roughly 300 days without load-shedding by March 2026 and forecast a stable winter. That is genuinely good news, but it changes the design question rather than removing it. Electricity prices are still rising far faster than inflation, and the grid's recovery is recent enough that most installers, insurers and energy analysts still treat intermittent load-shedding as a risk worth planning for. This guide covers both motivations, backup and savings, and shows the sizing arithmetic.

Where load-shedding stands in 2026

The 2023 peak saw sustained Stage 4 to Stage 6 cuts. Since mid-2024, improved generation performance at Eskom's coal fleet, returning units and new private generation have kept the grid largely stable, and by early 2026 Eskom had recorded around 300 consecutive days without load-shedding. Brief returns to load-shedding did occur during the recovery period, usually when several large units tripped at once, so the honest planning assumption for 2026 is: mostly stable, with occasional short-notice interruptions still possible. Municipal load reduction, a separate practice where overloaded local networks are switched off in specific areas, also continues in some regions regardless of national load-shedding status.

How the stages work

Load-shedding is organised in stages, each shedding roughly 1,000 MW more than the last. Your suburb is cut in scheduled blocks, typically around 2 to 4 hours at a time (Eskom direct areas usually 2 hours plus switching time, many municipalities 2.5 to 4 hours). Higher stages mean more blocks per day, not longer individual blocks in most schedules.

For system design, the key number is the length of a single outage block, because that is what your battery must bridge, plus how quickly it can recharge before the next block.

Eskom tariffs: the other reason to install

Even with the lights on, the economics push toward solar. NERSA granted Eskom a 12.74% increase for direct customers from 1 April 2025, and approved further increases of roughly 8.8% for April 2026 with a similar rise pencilled in for 2027 (figures were still subject to regulatory adjustment at the time of review, so check the current NERSA determination). Municipal customers typically pay more than Eskom-direct rates, and municipal increases land on 1 July each year, often above the Eskom figure. A decade of double-digit or near-double-digit compounding is the backdrop: every kilowatt-hour you self-generate is a kilowatt-hour you do not buy at next year's price.

Backup vs savings: three system types

1. Inverter and battery only (no panels)

An inverter-charger with a lithium battery bridges outages by charging from the grid when power is available and running essentials when it is not. It is the cheapest way to beat load-shedding, but it generates nothing: you still buy every unit, plus 10 to 20% round-trip losses. It makes sense when outages are your only concern or roof space is unavailable.

2. Grid-tied solar only (no battery)

Panels and a grid-tied inverter cut your bill, but by law the inverter must disconnect the moment the grid fails (anti-islanding, required so line workers are not electrocuted by back-fed power). During load-shedding a grid-tied-only system produces nothing. It maximises savings per rand spent, but offers zero backup.

3. Hybrid solar (panels, hybrid inverter, battery)

The dominant choice in South Africa. A hybrid inverter forms its own island during an outage, running essential circuits from solar and battery, and cuts your bill the rest of the time. It costs the most upfront but addresses both problems, and daytime solar recharges the battery between outage blocks, which grid-charged systems cannot do at Stage 4 and above when blocks come close together.

Sizing a battery for stage outages

Start from your essential loads, not your whole house. Lights, Wi-Fi, TV, laptops, a fridge and phone chargers typically total 300 to 800 W. Geysers, stoves and heaters should stay off backup circuits.

Then work backwards to nameplate battery size. Lithium (LiFePO4) batteries are usually cycled to 80–90% depth of discharge, and the inverter loses roughly 5–10% converting DC to AC:

In practice you would fit a 4 to 5 kWh battery: it covers the calculated need with margin for a longer block, a fridge compressor start, or a second outage before the sun or grid returns. This is why the common South African starter package pairs a 5 kW hybrid inverter with a 5 kWh battery. List your actual essential circuits rather than guessing; our load calculator and battery runtime calculator do the arithmetic both directions.

SSEG registration and municipal rules

Any grid-connected small-scale embedded generation (SSEG) system must be registered with your electricity supplier, whether that is Eskom or your municipality, and must use an inverter on the approved list (NRS 097-2-1 compliant). Rules and costs differ by municipality:

• City of Cape Town runs the most developed programme: registered customers on the correct tariff can sell surplus power to the city through its Cash for Power scheme, which had paid out over R25 million to households and businesses by 2026. An AMI bidirectional meter and, for most residential cases, a signed-off installation are required.
• Other metros (Johannesburg, Tshwane, eThekwini) require registration and sometimes a fixed monthly SSEG or capacity charge; export compensation ranges from reasonable to none.
• Eskom-direct customers register with Eskom; Eskom has periodically waived registration and connection fees for small residential systems, but the details change, so confirm the current process before installing.

Unregistered systems risk penalties, disconnection and insurance complications. Registration status and feed-in rules were still evolving at the time of writing; treat your municipality's current published requirements as authoritative.

The economics: self-consumption first

Export tariffs, where they exist, pay well below the retail rate you avoid by using your own solar. That makes self-consumption the engine of the payback calculation: aim panels and usage so that solar directly covers daytime load and recharges the battery, and treat any export income as a bonus. With retail tariffs compounding at high single or double digits, a system that offsets most of your daytime and evening consumption commonly pays back in 5 to 8 years for municipal customers, faster where tariffs are highest.

One nuance for prepaid meter households: some older prepaid meters register exported energy as consumption, effectively charging you for power you send out. If you have a prepaid meter, either ensure the system is set to zero-export or have the meter changed as part of SSEG registration.

Common mistakes

• Backing up the geyser, stove or aircon: these drain even large batteries in under an hour. Wire essentials only.
• Buying grid-tied-only to save money, then discovering it shuts down in every outage.
• Sizing the battery for the outage but forgetting recharge time between blocks at higher stages.
• Skipping SSEG registration and discovering the problem at claim time or on sale of the house.
• Assuming the 2026 calm is permanent and buying zero backup, or assuming 2023 will repeat and over-buying batteries. Design for short intermittent outages plus tariff escalation.
• Comparing quotes on price alone rather than on approved-list inverters, battery cycle life and workmanship warranty.

Frequently asked questions

Is load-shedding over in South Africa?

Mostly, for now. Eskom passed roughly 300 consecutive days without load-shedding by March 2026 and forecast a stable winter. But the recovery is recent, brief returns occurred during it, and municipal load reduction continues in some areas, so most designers still specify some backup capability.

What size battery do I need for Stage 4 load-shedding?

Multiply your essential load by the outage block length: 600 W of essentials over a 4-hour block needs about 2.4 kWh of usable energy, which means a 4 to 5 kWh lithium battery once depth-of-discharge and inverter losses are included. Larger essential loads scale linearly.

Do solar panels work during load-shedding?

Only if you have a hybrid or off-grid inverter. A standard grid-tied inverter must shut down when the grid fails (anti-islanding), so panels alone give you no power in an outage. A hybrid inverter with a battery keeps essential circuits running and recharges from solar.

Do I have to register my solar system?

Yes. All grid-connected SSEG systems must be registered with Eskom or your municipality and use an approved-list inverter. Unregistered systems risk penalties and can void insurance claims. Cape Town additionally lets registered customers sell surplus power through its Cash for Power programme.