How to Keep Internet Working During a Power Outage

Internet during a power outage usually stops because equipment inside the home needs mains electricity, even when part of the wider NBN network has backup power. Keeping a connection requires power for the NBN device and router, an upstream network that remains operational, and a working provider service. Mobile backup can help but is also affected by coverage, congestion and tower power.

Quick answer

To prepare internet for a blackout, identify every powered device between the NBN wall connection and Wi-Fi, then size a suitable UPS or battery for those devices. Test mobile hotspot coverage as a separate fallback and keep phones charged. Backup power cannot restore service when the upstream NBN or mobile network itself is unavailable.

Key takeaways

• A powered NBN connection box alone is not enough if the router has no power.
• NBN technology types and installed battery equipment differ by premises.
• A UPS supplies limited runtime and must be sized to device load and battery condition.
• Mobile backup may slow or fail during widespread emergencies.
• Emergency calling should never depend on one untested internet pathway.

Why internet during a power outage stops

NBN Co says equipment connected through the NBN generally will not work during a power outage. Some parts of the network have backup reserves, but household devices and local infrastructure can still lose power. Physical damage, flooding, fire or prolonged outages can interrupt connectivity even when the home has a battery.

The chain can include an NBN connection box or network connection device, provider modem-router, mesh points, cordless phone base, Ethernet switch and powered fibre or alarm equipment. Draw the chain for the actual home. Each required device needs power for the connection to continue.

What to compare before choosing

NBN technology and equipment

Use the address and labels to identify FTTP, HFC, FTTC, FTTN, fixed wireless or satellite and list every powered device. Technologies use different NBN-supplied equipment and have different dependencies inside and outside the premises.

Decision check: Which exact boxes must stay powered before the router can reach the provider network? Record the answer for every shortlisted option using the same period and assumptions. This prevents a promotional headline, isolated rate or theoretical feature from outweighing the conditions that determine the real household result.

Backup load and runtime

Read the wattage of required devices and choose a compliant backup system with adequate capacity, outlets and battery health. Advertised battery capacity does not equal unlimited runtime, and conversion losses reduce usable energy.

Decision check: How long will the required equipment run at its measured load, with a conservative battery margin? Record the answer for every shortlisted option using the same period and assumptions. This prevents a promotional headline, isolated rate or theoretical feature from outweighing the conditions that determine the real household result.

Mobile fallback

Test signal, hotspot setup, plan allowance and charging at the property before an emergency. A mobile option that has never been configured can fail through poor coverage, forgotten passwords, flat batteries or exhausted data.

Decision check: Can another household device connect to the hotspot in the rooms where it will actually be used? Record the answer for every shortlisted option using the same period and assumptions. This prevents a promotional headline, isolated rate or theoretical feature from outweighing the conditions that determine the real household result.

Critical communication needs

Identify medical alarms, monitored security, landline calling and vulnerable residents, then confirm backup requirements with each equipment provider. Some legacy or monitored services may not operate over NBN or during a blackout, and general internet advice cannot certify them.

Decision check: What written continuity and emergency instructions has the service or equipment provider supplied? Record the answer for every shortlisted option using the same period and assumptions. This prevents a promotional headline, isolated rate or theoretical feature from outweighing the conditions that determine the real household result.

What an FTTP battery does and does not power

Some FTTP premises have an NBN power supply with battery backup. NBN guidance describes limited operation for the connection box and selected voice configurations, but separate routers, computers and mains-powered phones require their own backup. Battery age and reserve behaviour also affect runtime.

Do not assume an NBN battery powers household Wi-Fi. Trace the cables and disconnect mains power briefly only when safe to test which devices stop. Follow manufacturer instructions and never modify NBN equipment or electrical wiring yourself.

Building a layered outage plan

Layer one is charged phones and a power bank. Layer two may be mobile hotspot or a mobile-backup router. Layer three is limited backup power for the fixed connection when the upstream network remains available. Keep offline copies of emergency contacts and local information because every communications network can be disrupted.

During a widespread event, preserve battery by lowering screen brightness, disabling unnecessary background activity and using text rather than high-bandwidth video where appropriate. Network congestion can make speed unreliable even with strong signal.

• Charge phones and power banks before forecast events.
• Keep router and hotspot passwords accessible offline.
• Test UPS runtime and replace ageing batteries.
• Follow emergency-service advice and do not rely on internet calls alone.

Safety and maintenance

Use backup power products designed and approved for the intended equipment. Do not run fuel generators indoors or in enclosed areas, and do not improvise wiring. A licensed electrician should advise on fixed home-battery or generator integration.

Retest the plan every six months and after changing provider, router or NBN equipment. Update firmware, confirm the mobile SIM remains active and inspect batteries for manufacturer replacement guidance. A plan that worked during a short local outage may not cover a long regional emergency.

Which option suits which household?

The examples below are starting points, not product rankings. Address eligibility, household behaviour, equipment, support needs and current plan terms can change the answer. A sound comparison uses the same real-world scenario for every option and keeps a dated copy of the information used.

A practical comparison process

Before choosing, create a one-page comparison record for the household. Note the service address or regular locations, current usage, equipment, support requirements, desired start date and any planned changes. Give every shortlisted option the same assumptions and annual comparison period. Record conditional discounts, expiry dates, installation or activation costs, cancellation consequences and the source document date. Keep uncertainty visible instead of forcing a false exact answer. This record makes it easier to explain the decision, spot a changed condition and review whether the selected option still represents value after the first complete billing or recharge cycle. Revisit the shortlist whenever a key assumption, price, address, device or household requirement changes.

1. Identify the NBN technology and every powered network device.
2. Measure or obtain device power requirements.
3. Select compliant backup power for the required runtime.
4. Configure and test a separate mobile fallback.
5. Document emergency calling and critical-device procedures.
6. Retest batteries, SIM activity and connections every six months.

Common mistakes

• Powering the NBN box but forgetting the router.
• Assuming upstream networks always survive a blackout.
• Buying a UPS without checking load and runtime.
• Relying on an untested hotspot or inactive SIM.
• Treating ordinary internet backup as certified medical-equipment protection.

Where a plan, price or service feature can change, save the Critical Information Summary, energy plan document, bill estimate or provider terms with the date. Recheck eligibility at the service address immediately before applying and inspect the first complete bill or recharge cycle against what was promised.

Bottom line

Keeping internet during a power outage requires both a working network and power for every essential household device. Build a limited fixed-line backup, test mobile fallback and keep offline emergency options. When comparing internet plans, treat 4G backup as one layer rather than a guarantee.

Related CompareUs resources

• compare internet plans
• check your internet speed
• what NBN speed do I need
• switch NBN providers with a BYO modem
• CompareUs internet guides

Sources and editorial method

CompareUs reviewed Australian government, regulator, network and provider material available on 28 July 2026. Competitor pages were used only to understand search intent and common consumer questions. No competitor wording, ranking or table was copied. Current prices and availability must be confirmed using address-specific results and official plan documents.

• NBN Co — What happens in a power blackout — official household equipment and outage warning
• NBN Co — Preparing for emergency events — network resilience, backup limits and alternative connectivity
• NBN Co — FTTP user guide — battery reserve, router and powered-device guidance