Portfolio — Climate

Wattvault

Retired EV batteries still have most of a life left.

Seed 2025 · $7.0M Climate Melbourne, Australia

Wattvault turns retired EV battery packs into stationary storage for commercial buildings, sold as a service rather than a capital purchase. Buildings shave their peak demand without financing the hardware up front, and packs get a second life instead of a scrapyard.

Two things line up here: retired packs that are far from finished, and buildings that want peak-shaving but not a capital line item. Nina connected them with a service model that makes the maths work for both sides. We like it when the sustainable option is also the cheaper one.

Visit Wattvault

Wattvault

  • Seed · 2025Stage
  • $7.0MRound
  • ClimateSector
  • Melbourne, AustraliaHeadquarters
  • 17Team
The founder

Nina Costa

Co-founder & CEO

Nina is an energy-storage engineer who couldn't stand watching EV packs get scrapped with most of their capacity intact. Wattvault is her answer: give them a second job holding up a building.

How it's gone
  • 2025

    We came in

    Seed round, first commercial buildings running on second-life storage.

  • 2025

    The model

    Energy-as-a-service structure proven out with the early customers.

  • 2026

    Supply

    Scaling how they source and refurbish reclaimed packs.

An illustrative 99SA Ventures profile — founder, team and figures stand in until the company shares its own.

Building something that has to work without a subsidy?

We look for climate and industrial businesses whose economics stand on their own. Show us yours.

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