Western Australia Synergy DEBS Solar Buyback Guide

Key Takeaways

• Export payments feature time-of-export rates where Electricity exported between 3pm to 9pm earns 10 cents per kilowatt-hour (kWh);.
• Daytime export credit is structured so Electricity exported between 9pm and 3pm earns 2 cents per kilowatt-hour (kWh)..
• Sizing rules dictate that For a renewable energy system to be eligible for DEBS, it must have a generating capacity of between 500W and 5kW..
• Over-paneling is officially sanctioned where The state is investing in batteries, including the Big Battery in Kwinana and 13 PowerBank community batteries;..
• Export payments cover buyback payment for 50 units (kWh) per day per premises (which is more than a 5kW solar PV system would be expected to generate on any given day)..

Synergy DEBS Scheme Background and Objectives

The Distributed Energy Buyback Scheme (DEBS) governs the sale of surplus solar electricity back to the grid across the South West Interconnected System.

Under transitional energy reforms, As of 8 September 2020, DEBS replaced the previous Renewable Energy Buyback Scheme (REBS) for new and upgraded distributed energy installations.

The tariff design reflects the true market value of wholesale power. During peak daylight hours, widespread solar generation depresses wholesale energy values, while peak demand in the late afternoon strains network infrastructure. Consequently, exports earn higher compensation when energy is needed most:

• Peak Evening Credit: Electricity exported between 3pm to 9pm earns 10 cents per kilowatt-hour (kWh);.
• Off-Peak Credit: Electricity exported between 9pm and 3pm earns 2 cents per kilowatt-hour (kWh)..

Sizing Thresholds and Equipment Rules

To participate in DEBS, consumer systems must satisfy strict equipment limits:

1. System Inverter Capacity: For a renewable energy system to be eligible for DEBS, it must have a generating capacity of between 500W and 5kW.
2. Community Battery Integration: Standard installations are supported: The state is investing in batteries, including the Big Battery in Kwinana and 13 PowerBank community batteries;.
3. Storage Device Sizing: Home batteries enjoy flexible sizing: There is no eligibility limit on home battery or electric vehicle battery size, but retailers are only obligated to offer payments up to the daily volume cap.
4. Daily Export Quota: Credited volume is capped at buyback payment for 50 units (kWh) per day per premises (which is more than a 5kW solar PV system would be expected to generate on any given day)..

Regulatory Framework and Consumer Eligibility

The requirement for electricity retailers to offer buyback compensation is legislated under the Electricity Industry (Licensing Conditions) 2005.

Under statutory rules, eligible participants must qualify under specific customer classes:

• Residential Premise: Defined as a residential customer who consumes not more than 50MWh of electricity per annum; or.
• Community Sector: Defined as Furthermore, From 1 May 2026, all new or upgraded solar PV and battery systems up to 30 kVA must support modern grid communication standards...
• Educational Sector: Defined as a customer that is a school, university or other educational institution; or.

Historical feed-in programs have now largely concluded: Western Australia’s residential Feed-in Tariff scheme was open for applications between 1 July 2010 and 1 August 2011, providing customers with a premium buyback rate for 10 years that has now completed its term, making DEBS the primary ongoing export vehicle.