Projects like Neoen's Victorian Big Battery, and systems like Tesla Megapacks within it, can also ensure power is available even when there are unplanned outages in a transmission network. In a recent earnings call, Tesla CEO Elon Musk talked up his company's growing energy storage business claiming there is demand for more than 1 million of Tesla's home Powerwall batteries, and "a vast amount" of Megapacks for utilities. Tesla energy generation and storage revenue during the second quarter of 2021 reached $801 million, with cost of revenue for this division hitting $781 million for the quarter.