Tesla Megapack Powers 44,000 New Zealand Homes: 100MW/200MWh Battery Goes Live
5 min read read
New Zealand's largest grid-scale battery storage system is now online. Contact Energy's Glenbrook Ohurua Battery 1 — powered by 56 Tesla Megapack 2XL units — switched on May 25, 2026 at New Zealand Steel's Glenbrook site in South Auckland, delivering 100MW of power and 200MWh of storage capacity to the national grid. The project marks the first installation of the Megapack 2XL model in the country.
At full output, the system can supply the equivalent of 44,000 homes for more than two hours during peak winter demand. More practically useful to grid operators is its response time: 0.2 seconds from receiving a grid signal to discharging power — a near-instant reaction that mechanical generation simply cannot match.
Why South Auckland, and Why Now
The choice of New Zealand Steel's Glenbrook site was deliberate. South Auckland represents one of the country's most constrained transmission nodes, and locating a large battery at an existing industrial site avoids the permitting complications of greenfield construction. Contact Energy broke ground in July 2024, creating approximately 50 construction jobs, and delivered the project on time and under budget — a notable achievement for a first-of-its-kind Megapack 2XL installation in the Pacific region.
Contact Energy CEO Mike Fuge described the system's multi-role capability in terms that cut through the technical complexity:
"It's a bit like the Swiss Army Knife of the electricity system — it can store excess renewable energy when there's too much, and release it rapidly during demand spikes."
That flexibility — absorbing surplus wind and hydro generation, then discharging during evening demand peaks — is exactly what New Zealand's grid needs as it transitions away from gas peaker plants. The country has committed to 100% renewable electricity generation by 2030, and large-scale storage is the gap-filling infrastructure that makes intermittent generation dispatchable.
System Specifications and Scope
| Parameter | Specification |
|---|---|
| Power output | 100 MW |
| Storage capacity | 200 MWh |
| Duration | 2 hours at full output |
| Units | 56 × Tesla Megapack 2XL |
| Grid response time | 0.2 seconds |
| Homes equivalent | 44,000 for 2+ hours |
| Online date | May 25, 2026 |
| Construction start | July 2024 |
| Jobs during build | ~50 |
The project involved a consortium of companies beyond Contact Energy and Tesla: Transpower (New Zealand's grid operator), Omexom, ABB, Entec, Obertech Group, Worley, and ElectroNet Group all contributed to installation and commissioning.
Tesla's Expanding Energy Footprint
The New Zealand project is part of a broader Megapack deployment wave that Tesla has been executing globally. In Q1 2026, Tesla deployed 8.8 GWh of energy storage products — down from the record-setting 14.2 GWh in Q4 2025, but still a significant step-up from the 10.4 GWh Tesla managed in Q1 2025. The quarter-to-quarter variation reflects the project-driven nature of utility-scale storage: deployments cluster around project completion milestones rather than flowing evenly across quarters.
Tesla is simultaneously preparing its next hardware generation: Megapack 3, scheduled for volume production in late 2026, will offer 5 MWh per unit — a 28% capacity increase over Megapack 2 in an identical footprint. A dedicated Megapack 3 factory in Houston is targeting 50 GWh of annual production capacity. Projects like Glenbrook, which use current-generation Megapack 2XL hardware, demonstrate the demand pipeline that justifies that manufacturing investment.
What Comes Next at Glenbrook
Contact Energy secured an option to expand the Glenbrook site to 130MW, which would make it New Zealand's largest single battery installation. Beyond that expansion, the company has announced a second project — Glenbrook Ohurua Battery 2 — projected at 200MW/400MWh and targeted for operational status in Q1 2028. Both expansions are backed by Contact Energy's NZ$525 million equity raise, which was earmarked specifically for renewable energy and storage infrastructure.
The progression from 100MW to a potential 200MW at a single site in South Auckland reflects how quickly grid-scale battery economics have shifted. When Contact Energy first contracted Tesla for this project in mid-2024, a 100MW battery in New Zealand was considered ambitious. By the time Battery 2 reaches its planned 200MW, that scale will be the new baseline for serious grid storage projects in the region.
The Bottom Line for Tesla Energy
The Glenbrook Ohurua Battery 1 going live is exactly the kind of reference installation that matters for Tesla's energy business. It demonstrates Megapack 2XL performance at commercial scale in a new geography, delivered on time, by a credible utility partner. For New Zealand's grid, it provides a concrete path toward the kind of fast-responding storage that makes renewable-heavy systems actually reliable. And with Battery 2 already in planning, the relationship between Contact Energy and Tesla is built for the long term, not a single transaction.
Photo: Tesla industrial energy storage / Pexels