Expanded Tesla big battery charges up for final testing

French renewables developer Neoen has announced that final testing of the expanded 150 MW Hornsdale Power Reserve has kicked off. If the tests run smoothly, the extra power will be available to the market within weeks.

The expansion of the world’s largest operating battery is progressing at a fast pace as the system readies to further stabilize South Australia’s renewables-dominated grid. The 100MW/129MWh Hornsdale Power Reserve, also known as the Tesla Big Battery, which is being expanded by 50%, through the addition of 50MW/64.5 MWh of Tesla batteries, is set to provide a range of new grid support services, such as digital inertia[2].

After it had received regulatory approval last week[3] from the Essential Services Commission of South Australia to vary the system’s electricity generation license in line with the expanded capacity, project owner Neoen announced on Friday that final testing on the expanded Hornsdale Power Reserve has commenced.

Minister for Energy and Mining Dan van Holst Pellekaan said the start of testing is a key milestone for the Hornsdale Power Reserve, which will allow the world’s largest lithium-ion battery to provide new grid support services at a scale unmatched in the world. “The significant expansion of Neoen’s ‘Big Battery’ is evidence of the innovation taking place in South Australia’s energy sector, and the benefits that grid-scale storage can provide,” he said.

The battery system located adjacent to the 315 MW Hornsdale Wind Farm has already demonstrated its immense value for the grid in a number of ways,[4] largely by bringing down grid stabilization costs through its interventions in the frequency control markets. For its owner, the Tesla big battery has translated into a substantial surge in revenue, most pronounced in the final quarter of last year when it contributed most of Neoen’s 56% leap in revenue[5].

“Independent modelling indicates that the Hornsdale Power Reserve has already delivered more than $150 million in savings to consumers in its first two years of operation. Upon successful completion of testing in the next few months, we expect these savings will continue to grow,” Van Holst Pellekaan said. “The increase in storage power and capacity mean a faster response to disturbances such as network faults, so that within milliseconds the Hornsdale Power Reserve can help stabilise the grid.”

Having attracted an $8 million Australian Renewable Energy Agency (ARENA) grant, $15 million in state funding from SA’s $50 million Grid Scale Storage Fund, and $50 million in project financing from the Clean Energy Finance Corporation (CEFC), the $71 million battery expansion[6] is expected to further demonstrate the benefits big batteries. “This will help inform the regulatory changes required to create new markets which attract new technologies to support renewable energy,” the minister added.

Namely, the upgraded Hornsdale Power Reserve is readying to make history as the first battery in the National Electricity Market (NEM) to provide both Frequency Control Ancillary Services (FCAS) and grid-scale inertia, which will mimic the mechanical inertia services traditionally provided by synchronous generators, such as coal and gas, leveraging the power of its grid-forming inverters[7].

Managing Director of Neoen Australia, Louis de Sambucy, said the Hornsdale Power Reserve’s testing phase will ensure that the completed expansion meets the highest performance standards. “The expansion will make Hornsdale Power Reserve 50% bigger and will deliver ground-breaking innovations to increase grid security and further unlock renewable energy performance in South Australia,” he said.


  1. ^ Posts by Marija Maisch (www.pv-magazine-australia.com)
  2. ^ digital inertia (www.pv-magazine-australia.com)
  3. ^ regulatory approval last week (www.pv-magazine-australia.com)
  4. ^ immense value for the grid in a number of ways, (www.pv-magazine-australia.com)
  5. ^ 56% leap in revenue (www.pv-magazine.com)
  6. ^ $71 million battery expansion (www.pv-magazine-australia.com)
  7. ^ grid-forming inverters (www.pv-magazine-australia.com)

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