Energex's solar connection process is the single most common cause of installs slipping past handover. Not the install itself — that takes a day. The grid-connection approval that turns the system on can take 5 to 30 business days, depending on which estate you're in and how the application is lodged. If your build program treats it as an afterthought, you'll find yourself handing over homes with isolated solar systems and a homeowner asking why their inverter screen says "Standby."
This article walks through the actual timeline, the things that lengthen it, and where in your build program the application should be lodged.
The two-phase application
Every grid-tied solar install in SE QLD has two Energex interactions:
- Connection application — submitted before installation. Energex reviews the proposed system size against the local network's capacity. Approval triggers permission to install.
- Energisation request — submitted after installation, with the electrical safety certificate and commissioning data. Approval triggers permission to export.
The first one is what most builders mean when they say "Energex approval." The second one, energisation, is mostly automatic provided the install matches the application. Delays usually live in phase 1, occasionally in phase 2 if the install spec drifted from what was approved.
Standard approval timelines
For a typical 6.6 kW residential install in a stable Energex network area:
- Connection application — 5 to 10 business days from lodgement
- Install window — once connection is approved, install can occur any time
- Energisation — 1 to 3 business days from documentation upload
Total from lodgement to "system is live and exporting" is usually 7 to 15 business days, with the install itself sitting somewhere in the middle. The variance is in phase 1.
What lengthens phase 1
Export-limited estates
Some new estates are released with export limits — typically 5 kW per dwelling, occasionally lower in greenfield estates with constrained network capacity. Your installer can still install a larger system, but the inverter will be configured to limit grid export. This is not a delay per se, but if the application is for a system the network won't accept at full export, Energex will refer it back for spec adjustment, adding 5-10 business days while the application is amended.
How to handle: have your installer pre-check the local export-limit policy for the specific estate before lodging. The information is published in Energex's Network Connection Manual but updates faster than the manual reflects. Most installers maintain their own internal lookup tables.
Three-phase upgrades
Larger systems (typically >10 kW or 13.3 kW total inverter capacity) require three-phase connections, which themselves trigger an upstream network capacity check. In areas with older single-phase distribution, this can mean a transformer upgrade or service upgrade. That's not a 10-business-day approval — it can be months, and the cost is recoverable from Energex but only after a contributions assessment.
How to handle: keep the system to 10 kW or under unless the home is already three-phase by design (premium / EV / pool spec). The Premium package (10 kW + battery + EV) is at the upper edge of what stays single-phase friendly.
Vegetation clearance flags
Estates with overhead service lines crossing native vegetation can have applications referred for vegetation-clearance review. Most new-build estates use underground service, which avoids this entirely. It only comes up on infill blocks or rural-residential builds.
Application data errors
About 10–15% of solar applications get bounced back for trivial data errors — wrong NMI, wrong site address spelling, mismatched panel/inverter STC eligibility codes. Each bounce adds 3–5 business days. The fix is using an installer with experience in the specific estate; their internal checks catch these errors pre-submission.
Where in your build program to lodge the application
The right answer depends on whether your installer is doing solar at roof-on (during construction) or post-handover.
Roof-on / single-visit install
This is the model Trade Solar runs. Application is lodged 2-3 weeks before the scheduled roof-on date. By the time the roof is on and the crew arrives, Energex has approved the connection. Install + commissioning happens in one visit. Energisation paperwork is uploaded the same day. The system is live within 1-3 business days of install.
Net result: solar is fully functional at handover. Homeowner moves in, presses the inverter screen, sees export.
Post-handover retrofit
This is the retail-solar model. Solar is installed after the homeowner moves in, often 2-3 months later. The application can be lodged at any time but typically isn't lodged until the customer signs the install order, which is itself often weeks after handover.
Net result: handover happens with no solar. Homeowner has to coordinate the install, take delivery, commission, energise. Builder has nothing to do with it but gets the calls when the homeowner is confused about why "the solar wasn't ready."
The first model is universally better for the builder's experience — solar is finished when the keys turn over, the homeowner doesn't see a separate solar journey. The application timing is what makes that work, and it has to be coordinated with the install partner.
What Trade Solar does on the application side
We lodge the Energex connection application on the builder's behalf, using NMI and site data drawn from the build address. Application is submitted at the time we confirm your install slot — typically 2-3 weeks ahead of roof-on. Our internal pre-check covers export limits per estate, three-phase requirement triggers, vegetation flags, and STC eligibility codes, so we don't get bounced back for trivial errors. By the time our crew arrives at roof-on, the connection is approved and the system can be commissioned same-day.
For Toowoomba and points west, the equivalent process runs through Ergon Energy with similar timing characteristics. Application sequencing is the same; the difference is the network operator's portal and capacity-check rules. We handle both.
The take-home
Treat Energex connection as a 2-3 week lead-time item that runs in parallel with your build, not as a post-install bureaucratic step. Lodge early, lodge accurately, and synchronise install with approved status. Your install partner should be doing this for you; if they aren't, that's a process gap to close before it costs you a handover.