Tesla Megapacks Begin Grid Service at Canberra’s 500 MWh Williamsdale Battery
Eku Energy has commissioned the Williamsdale battery in the Australian Capital Territory, bringing a Tesla Megapack installation into operation rather than adding another project to the development pipeline. The developer’s November 5 announcement identifies a 250 MW, 500 MWh system using Megapack 2 XL batteries.
The ACT government’s joint announcement also says the facility is operational. It counts 136 Tesla batteries and describes Williamsdale as the largest battery energy storage system in the territory’s history. Eku led the development and will continue managing the facility.
What has switched on
The government says the battery can supply the equivalent of one-third of Canberra’s electricity needs for up to two hours during peak demand. That is a bounded comparison, not a promise to power the whole city through an extended outage.
| Project measure | Announced specification |
|---|---|
| Power | 250 MW |
| Stored energy | 500 MWh |
| Battery units | 136 |
| Technology | Tesla Megapack 2 XL |
Power and stored energy describe different limits. The megawatt rating describes the rate of delivery; megawatt-hours describe the amount stored. Dividing the announced energy capacity by the power rating gives two hours. Actual dispatch depends on how much energy is available and how the plant is operated, so that calculation should not be mistaken for a continuous-output guarantee.
A Tesla deployment with several delivery partners
Eku names Consolidated Power Projects as the balance-of-plant contractor, Evoenergy as the electricity distribution network provider and AEMO as supporting the grid-connection approval process. Tesla supplies the battery technology within that wider project.
The ACT government describes the operating role as storing renewable electricity and returning it when needed, with a response to grid changes measured in milliseconds. Williamsdale sits alongside smaller neighbourhood batteries in Dickson, Casey and Fadden in the territory’s broader storage program.
What the milestone establishes
For Tesla’s energy business, the concrete development is an installed project reaching grid service. Commissioning is more informative than a proposed capacity figure, but it is not a measure of lifetime reliability or financial return. Those outcomes will emerge from operation. The immediate change is that Williamsdale’s batteries are available to serve the grid, rather than remaining a future addition.