Cactos builds energy storage systems with old Tesla batteries. It just raised $28.5 million with this 24-slide pitch deck.

• Finnish energy storage startup has raised 26 million euros ($28.5 million) in fresh funds.
• The cash is part of a separate fund that will be used to finance the roll-out of the batteries. 
• Check out the 24-slide pitch deck it used to raise the capital below.

A Finnish startup that uses both recycled Tesla batteries and new batteries to build energy storage systems has raised 26 million euros, $28.5 million, in fresh funds.

Cactos, which was founded in 2021, has developed storage systems that enable companies operating in areas like real estate and logistics to buy energy when it's cheap and plentiful, store it, and use it later.

Oskari Jaakkola, the startup's chief executive, said the electricity market recorded "1,000-fold intraday price fluctuations."