Pacific Green, ZEN Energy pen 1.5GWh tolling deal for three BESS across Australia

August 6, 2025
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Pacific Green Technologies has inked a 10-year tolling agreement with Australian renewable energy developer ZEN Energy across three battery energy storage systems (BESS) totalling 1.5GWh of capacity.

Little detail has been provided on the agreement, including the specific projects encompassed in this deal; however, the locations are in Victoria, New South Wales, and Queensland.

According to Pacific Green’s CEO, Scott Poulter, the deal will help the organisation underwrite a “significant” part of its development portfolio across the three Australian states.

In a tolling agreement, an offtaker or route-to-market provider pays a guaranteed fixed price to the asset owner in exchange for the right to trade and participate in markets using some or all of the battery storage capacity, as detailed by market intelligence firm Modo Energy in this video explainer.

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It marks another BESS milestone in what has been a busy year so far for Pacific Green. For instance, the US-headquartered energy storage developer agreed to sell its 250MW/500MWh Limestone Coast North Energy Park BESS in South Australia to Intera Renewables in a deal worth AU$460 million (US$293 million).

Meanwhile, ZEN Energy has rapidly been expanding its presence within the Australian renewables and energy storage sector, particularly through its joint venture with Taiwan’s HD Renewable Energy called ZEBRE.

Since its launch, ZEBRE has acquired several development projects in Australia as it eyes creating a 1.4GW renewables and energy storage portfolio. 1GW of this figure will be comprised of energy storage.

The first project the JV secured was the 210MW Solar River solar-plus-storage site in South Australia, which features a 256MW co-located BESS.

AGL Energy and Engie Australia pen virtual storage agreement

In other news, the Australian entity of utility and power firm Engie has signed a firm 100% virtual energy storage agreement, which is a first of its kind for Engie Australia.

From 2027, Engie will purchase energy via a five-year, derivatives-only agreement, enabling the group to emulate the operational flexibility of a two-hour BESS. The deal will be backed by AGL’s BESS assets located in New South Wales.

The capacity that Engie will secure from AGL has not been disclosed at the time of reporting.

Although Engie says this deal is a “first of its kind” for the Australian entity, at the end of last year, Engie Australia penned a virtual battery offtake agreement with developer Neoen for a portion of the Victorian Big Battery, which was recently sold to HMC Capital.

This virtual battery offtake agreement covers 40MW of the 300MW/450MWh Victorian Big Battery capacity.

Our publisher, Solar Media, will host the Battery Asset Management Summit Australia 2025 on 26-27 August in Sydney. You can get 20% off your ticket using the code ESN20 at checkout.

17 March 2026
Sydney, Australia
As we move into 2026, Australia is seeing real movement in emerging as a global ‘green’ superpower, with energy storage at the heart of this. This Summit will explore in-depth the ‘exponential growth of a unique market’, providing a meeting place for investors and developers’ appetite to do business. The second edition will shine a greater spotlight on behind-the-meter developments, with the distribution network being responsible for a large capacity of total energy storage in Australia. Understanding connection issues, the urgency of transitioning to net zero, optimal financial structures, and the industry developments in 2026 and beyond.
9 June 2026
Stuttgart, Germany
Held alongside The Battery Show Europe, Energy Storage Summit provides a focused platform to understand the policies, revenue models and deployment conditions shaping Germany’s utility-scale storage boom. With contributions from TSOs, banks, developers and optimisers, the Summit explores regulation, merchant strategies, financing, grid tariffs and project delivery in a market forecast to integrate 24GW of storage by 2037.
15 September 2026
San Diego, USA
You can expect to meet and network with all the key industry players again in 2025 from major US asset owners, operators, RTOs and ISOs, optimizers, software and analytics providers, technical consultancies, O&M technology providers and more.
15 September 2026
Berlin, Germany
Launching September 2026 in Berlin, Energy Storage Summit Germany is a new standalone event dedicated to Germany’s energy storage market. Bringing together investors, developers, policymakers, TSOs, manufacturers and optimisation specialists, the Summit explores the regulatory shifts, revenue models, financing strategies and technology innovations shaping large-scale deployment. With Germany targeting 80% renewables by 2030, it offers a focused platform to connect with the decision-makers driving the Energiewende and the future of utility-scale storage.

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