Tesla has reported a significant year-on-year increase in business for its stationary energy storage systems, but more attention has been focused on delays in Model 3 deliveries and a decline in solar installs.

Tesla boss Elon Musk has claimed that his company is already sold out of stationary storage products for next year before the first ones have even been shipped to customers.

The opening keynote address at Intersolar North America next week will be delivered by Tesla’s chief technical officer (CTO) JB Straubel.