Cell tower backup power, battery hours and the dual-SIM trick that keeps you online.
Load shedding is a uniquely South African problem — and one of its most frustrating side effects is that it doesn't just kill the lights. It knocks out your Wi-Fi router, your fibre connection, and your ability to work, study, or stream from home. In those moments, your mobile data becomes your lifeline.
But here's the thing most South Africans don't know: load shedding affects mobile networks too. Cell towers run on electricity. When the grid goes down, towers switch to backup power — batteries and generators — and those backups don't last forever.
MTN and Vodacom have invested the most heavily in backup power infrastructure. For most South Africans, either will keep you connected through a standard 2–4 hour outage. Telkom and Cell C are less consistent. Rain is the most vulnerable — it's a newer, smaller network with fewer backup resources.
The tower runs on grid power. Full signal, full capacity. Everything works as expected.
The tower switches instantly to battery backup (UPS). Most towers have batteries lasting 2–8 hours depending on how recently they were maintained and how much traffic is hitting the tower.
Some towers are connected to diesel generators which kick in automatically. Generator-equipped towers can run for much longer — sometimes days — but generators need fuel, and fuel theft is a genuine problem at tower sites in SA.
You lose signal entirely. This is when you'll see "No service" on your phone despite having a full SIM. The experience depends on how many backup hours towers in your area have and how much extra demand there is from everyone else in the same outage block switching from Wi-Fi to mobile data simultaneously.
The most effective strategy. Keep your main SIM (MTN or Vodacom for load shedding resilience) and a Telkom SIM for cheap daily data. Switch automatically to the one with signal.
A UPS or power bank for your home Wi-Fi router costs R400–R1,200 and can run your router for 4–8 hours. This means load shedding doesn't affect your internet at all if your network tower stays up.
Use the EskomSePush app to know exactly when load shedding starts. In the 30 minutes before your slot, download what you need: meetings, files, entertainment.
If your MTN or Vodacom signal consistently drops during 2-hour outages in your area, the local tower has weak backup. This is a sign to add a second SIM from a network whose infrastructure holds up better near you.
Your phone battery lasts longer than your router. If your home internet goes down during load shedding but your mobile signal holds, use your phone as a mobile hotspot for your laptop or other devices.
If load shedding resilience matters to you, keep a Telkom SIM for everyday cheap data and an MTN or Vodacom SIM as your backup for when the lights go out. You can buy a R85 MTN 1GB bundle once a month and it'll last through most load shedding periods.
When the power goes off, home fibre usually goes with it. The fibre line itself may be fine, but the router and the ONT box at your house lose power, so the connection drops unless you have a battery backup. Mobile data does not depend on your home power, which is why so many South Africans fall back on a phone hotspot the moment load shedding starts.
The catch is that mobile towers also rely on power, and during longer stages some towers run out of battery backup before the grid returns. Knowing how each network copes with extended outages helps you pick a provider that actually stays online when you need it.
A 10000mAh power bank can recharge a phone two or three times, which is more than enough to ride out a four hour slot. Charge it whenever the power is on so it is always ready.
Hotspotting a laptop drains both your battery and your bundle fast. Lower screen brightness, close background tabs and avoid video calls if you are trying to make data and battery last through a full stage six day.
If you work from home, a small UPS for your fibre router plus a mobile data backup SIM is the most reliable setup. The UPS keeps fibre alive for short outages and the mobile SIM covers you when a tower or the fibre stays down longer.
Download the load shedding schedule for your area and keep an offline copy. Knowing exactly when power returns lets you plan downloads, backups and video calls around the slots instead of being caught off guard.
Every price and bundle detail on this page is taken directly from the official prepaid pages of Vodacom, MTN, Telkom, Cell C and Rain, then cross checked against pricing coverage on mybroadband.co.za and businesstech.co.za. We review the numbers at the start of each month and after any public price change.
DataCheck ZA is independent. We are not owned by any network and we earn nothing when you choose one over another. If something looks out of date, tell us on our contact page and we will recheck it.
Usually yes, at least for the first part of an outage. Mobile towers have battery backup that keeps them running through normal slots, but during long or back to back stages some towers can run flat before power returns, which causes weaker signal in affected areas.
Fibre depends on powered equipment in your home such as the router and ONT box. When your power goes off, that equipment switches off and the connection drops. Mobile data runs from the network towers instead, so it keeps working as long as the tower has power.
The larger networks have invested heavily in tower batteries and generators, so coverage during outages is generally most stable on the bigger operators in built up areas. Your real world experience depends on the specific towers near you, so a backup SIM on a second network is the safest plan.
Turn off automatic updates and cloud backups, pause video streaming, and lower call quality. These background tasks quietly use the most data and battery, so disabling them stretches both your bundle and your phone charge through the outage.
Find the best bundle for your everyday use — and a backup SIM for load shedding.
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