QLD Power & Wastewater Rules: What the State Actually Sets

Queensland has the simplest distributor structure of the states covered so far — just two, Energex and Ergon — but a distinctive, much stricter export limit for properties on SWER rural power lines. Wastewater runs through the Plumbing and Drainage Act 2018, with a genuine size threshold splitting straightforward council approval from a separate state-level sign-off. This article covers what the state and distributors actually set for power and wastewater, before your specific council's requirements layer on top.

Queensland's power structure is simpler than NSW's or Victoria's, but its rural export limit is stricter, tied to a specific infrastructure type rather than just a general rural/urban split. Wastewater follows a similar council-approval pattern to the other states, with its own size-based split between council and state sign-off. Each is covered as its own section below.

Power: two distributors, and a distinctly low SWER-line limit

Queensland has just two electricity distributors, both part of state-owned Energy Queensland: Energex covers South East Queensland (Brisbane, Gold Coast, Sunshine Coast, Toowoomba), and Ergon Energy covers the rest of the state (Cairns, Townsville, Rockhampton, Mackay, Mount Isa and regional QLD generally). Both apply a standard 5kW per phase export limit for typical residential connections, with dynamic export arrangements sometimes available up to 10kW per phase where the local network has capacity.

The distinctive constraint is for properties connected via a Single Wire Earth Return (SWER) line — a low-cost method Ergon uses to run power long distances to sparsely populated rural areas. SWER-connected properties face a much lower export limit: typically 2kW, compared to the standard 5kW, regardless of inverter size. Some regional QLD towns are also seeing local transformer capacity tighten, with Ergon reducing automatic export approval below the standard 5kW in affected areas — worth checking the current position for your specific feeder before assuming the standard limit applies.

Wastewater: council approval, with a 20-person threshold to state sign-off

On-site sewerage facilities in Queensland — septic tanks, aerated wastewater treatment systems, composting toilets and similar — are regulated under the Plumbing and Drainage Act 2018 and the Queensland Plumbing and Wastewater Code. Local council approval is mandatory for any installation or alteration, and a system can't legally be installed without it. A Site and Soil Evaluator assesses the property to recommend the appropriate system type, and a qualified designer prepares the plans lodged with council — a similar pre-approval step to Victoria's Land Capability Assessment.

A important size split applies on top of council approval: systems servicing 20 or fewer equivalent persons are approved entirely at the local council level; systems for 21 or more need a separate approval from the state (currently the Department of Housing, Local Government, Planning and Public Works, or Environment for the largest systems). There's also a distinct Treatment Plant Approval (TPA) requirement specifically for treatment plants (aerated systems and similar) — a straightforward septic-only system doesn't need this separate approval, only council sign-off. Once installed, treatment plants typically need compulsory servicing every 3 months, with the service report going to both the owner and council within 10 business days.

An important disclaimer, worth taking seriously

The two-distributor structure, the SWER export limit, and the Plumbing and Drainage Act's council/state approval split are all verifiable, state-wide facts. But whether your property is SWER-connected, your local feeder's current hosting capacity, and your council's specific wastewater application requirements all depend on your specific circumstances. Confirm directly with Energex or Ergon and your council before installing solar, going off-grid, or installing a septic system — our South East Queensland and Regional Queensland power & wastewater rules by council tools cover a growing number of them directly.

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