Power & Wastewater Rules in Australia: A General Guide

Going off-grid or connecting solar in Australia is governed by your electricity network operator, not your council or state government directly, and every state has a different number of them. Septic and on-site wastewater work differently again, running through council (or a state health authority) under state-specific legislation. Neither system follows the same boundaries as the other.

Solar, off-grid power and septic systems all need approval in Australia, but not from the same body, and not in the same way from state to state. This guide explains the pattern that holds everywhere, so you know what to check and where, before diving into your specific state's article.

The number of electricity distributors varies enormously by state

Every state has at least one electricity distributor (also called a Distribution Network Service Provider), and the number ranges from one to five: South Australia and Tasmania each have a single distributor covering the whole state, Queensland and WA each have two, NSW has three, and Victoria has five. The Northern Territory is unique — its distributor runs three completely separate, isolated grids not connected to each other or the National Electricity Market that links every other state and territory covered in this guide.

Export limits differ by distributor, by rural status, and increasingly by real-time grid conditions

A standard 5kW-per-phase export limit is common but far from universal. Some states apply a stricter rural limit on top of the standard figure (NSW's Essential Energy network, Queensland's SWER-connected properties), while others are moving toward dynamic, real-time limits that vary by grid conditions rather than a single fixed number (SA's pioneering Flexible Exports, Victoria's and WA's newer flexible/tiered systems). Tasmania sits at the generous end, with a 10kW soft limit per phase, while the ACT recently changed its entire calculation method to a total-across-all-phases figure rather than a per-phase one. The takeaway that holds everywhere: check your specific address's current limit directly with your distributor, since a figure that applied even a year ago may no longer hold as local grids fill up with solar.

Wastewater approval is a council (or state health) matter, with different size thresholds

Every state requires approval before installing a septic tank or other on-site wastewater system, and every state maintains an approved-products list for the systems themselves, administered by a state health, environment, or building authority. What varies is the volume or equivalent-person threshold at which a straightforward council approval needs a separate state sign-off on top — from WA's precise 540 litres a day, up through Victoria's 5,000L, Queensland's 20 equivalent persons, to SA's generous 6,000L (40 equivalent persons). Tasmania is the outlier here too: council handles approval at every scale, without a size-based escalation to a separate state authority.

How to actually find your specific rules

For power, start with your specific electricity distributor (not your council) to confirm your address's current export limit and connection requirements. For wastewater, your council's environmental health or building department is the first point of contact, though very large systems may need a separate state health or environment department approval on top. If anything is unclear, a direct phone call is usually the fastest way to a definitive answer for your specific property.

We've also built researched deep dives for every state and territory, each covering what's actually set at state level for power and wastewater:

• NSW — three electricity distributors with a stricter rural export limit, and the two-stage council Section 68 septic approval process
• VIC — five distributors, a solar emergency backstop mechanism, and the Land Capability Assessment septic requirement
• QLD — just two distributors with a distinctly low SWER-line rural export limit, and the 20-person council/state wastewater threshold
• WA — the new May 2026 solar export pathway choice, and the Department of Health's 540L/day wastewater threshold
• SA — a single distributor with the country's first Flexible Exports system, and the highest wastewater council-approval threshold of any state
• TAS — state-owned TasNetworks with the most generous export limit of any state, and council-administered wastewater approval at every scale
• NT & ACT — three isolated NT grids not connected to the NEM, and the ACT's new total-export-limit model

An important disclaimer, worth taking seriously

Everything in this guide is a general pattern, not a substitute for checking your own distributor's and council's current rules directly. Export limits, approval thresholds and legislation all change over time, sometimes with very little notice (WA's and the ACT's rules both changed within the last 18 months). Treat this as a map of what to look for and why the rules vary the way they do, not as a definitive answer for your specific address.

Frequently Asked Questions