Ergon Retail Tariff Reform 2025: What C&I Queensland Customers Need to Know

From 1 July 2025, Ergon Retail is overhauling its electricity tariff structure for C&I customers across regional Queensland. These changes are due to Ergon Network’s new tariff structures, which came into effect on July 1^st 2025.  

Bundled retail tariffs are typically set based on the network tariff, which is hidden behind the bundled charges, hence, the update from Ergon Network has triggered updates to Ergon Retail tariffs. 

For both low voltage and high/sub-transmission customers, the reform includes new time-of-use demand tariffs and the phasing out of several long-standing options. If you’re currently on one of the affected tariffs, it’s essential to understand the upcoming changes and how they might impact your energy costs.

Low Voltage Customers

Who this applies to: 
C&I customers connected at low voltage, typically using over 100 MWh per year, or those currently on Ergon’s older demand tariffs. 

Obsolete Tariffs: 

The following tariffs will be closed to new entrants from 1 July 2025 and will be fully retired on 30 June 2026: 

• Tariff 45 – Demand Medium 

• Tariff 46 – Demand Large 

• Tariff 50 – Seasonal Time of Use Demand 

• Tariff 50A – Evening Peak Demand 

New Tariff Introduced: 

• Tariff 50B – A time-of-use demand tariff featuring: 

• Time-based energy pricing (peak and off-peak periods) 

• Monthly demand charges 

• A modern structure designed to reward customers who can shift load outside peak periods 

Tariffs That Remain: 

• Tariff 44 – Remains available but may not suit all load profiles. It uses a flat demand-based structure and does not offer the same time-based signals as the new tariff options. 

• Tariff 44A – Ergon have also released a new tariff which looks to be a replacement tariff to takeover Tariff 44. The structure of this tariff is identical; however, the rates vary slightly.

Sub-Transmission / High Voltage Customers

Who this applies to: 
Customers connected at high voltage or sub-transmission levels — typically large commercial and industrial users. 

Obsolete Tariffs (from 1 July 2025): 

The following tariffs will be closed to new entrants from 1 July 2025 and will be fully retired on 30 June 2026: 

• Tariff 52A – HV 33kV / 66kV Connection 

• Tariff 52B – HV 11kV / 33kV Bus Connection 

• Tariff 52C – HV 11kV / 33kV Line Connection 

Tariffs That Remain: 

• Tariff 51A – HV 66kV Connection 

• Tariff 51B – HV 33kV Connection 

• Tariff 51C – HV 11kV / 33kV Bus Connection 

• Tariff 51D – HV 11kV / 33kV Line Connection 

These tariffs will continue to be available for eligible high voltage customers beyond 2026, subject to ongoing Ergon policy. 

New Tariffs Introduced (from 1 July 2025): 

All new tariffs are time-of-use demand tariffs: 

• Tariff 52D – HV 66kV Connection 

• Tariff 52E – HV 33kV Connection 

• Tariff 52F – HV Bus Connection 

• Tariff 52G – HV Line Connection 

These new tariffs are designed to: 

• Reflect the real cost of supplying electricity during different times of the day 

• Provide clearer price signals to encourage off-peak usage 

• Support long-term network efficiency and stability

What This Means for C&I Customers

Ergon’s overhaul of retail tariffs presents both a strategic opportunity and a potential cost risk for large electricity users. With legacy tariffs being phased out, selecting the right replacement tariff is critical. 

The new structure now includes two core types of demand tariffs: 

• Anytime Demand Tariffs: 

• One demand charge based on your highest demand at any time during the billing period. 

• Simpler and more predictable, but not time-sensitive. 

• Time-of-Use (TOU) Demand Tariffs: 

• Two separate demand charges: 

• Peak demand (typically 5 PM – 8 PM on weekdays) 

• Shoulder demand (covering most other daytime hours) 

• Designed to reward businesses that can reduce usage during peak periods. 

Choosing the wrong tariff could lock in higher costs, while the right choice may lead to significant savings. 

• Businesses that can reduce or shift load before 5 PM — such as manufacturers or irrigators — are typically better suited to TOU demand tariffs. 

• Sites with steady or evening demand peaks — like pubs, clubs, and hospitality venues — may benefit from the simplicity of anytime demand tariffs. 

Every business has a unique load profile, and there’s no one-size-fits-all answer. That’s why it’s essential to model your usage and compare tariff outcomes before making the switch.

Want to know which tariff will minimise your electricity costs?

Our energy specialists can model your load profile and identify the best option for your business.

Book your free tariff review today and ensure you’re on the most cost-effective Ergon tariff for 2025 and beyond.