Tesla has unveiled the latest generation of its utility-scale energy storage solutions – Megapack 3 and Megablock. Megapack stores excess renewable energy and discharges it when demand peaks, supporting grid stability. Megablock is a pre-engineered 20 MWh AC medium-voltage block designed for a 25-year life and over 10,000 cycles, with 91% round-trip efficiency. At its launch event called ‘Las Megas’ at RE+, Tesla said the Megablock enables 23% faster installation, up to 40% lower construction costs, and a high site density of 248 MWh/acre. Powered by Megapack 3 with streamlined design, advanced cells delivered from the US, Southeast Asia, and China, and a 50 GWh annual capacity, deliveries start in H2 2026.