Cancelled
“It will take about a year to reach the 10 gigawatt hour capacity.”
— Elon Musk · Sep 22, 2020 · Tesla Battery Day, Sept 22 2020 (official Tesla YouTube channel, verified via YouTube oEmbed) 50:47 ↗
▶ WATCH HIM SAY IT @ 50:47 — TESLA BATTERY DAY, SEPT 22 2020 (OFFICIAL TESLA YOUTUBE CHANNEL, VERIFIED VIA YOUTUBE OEMBED)
What actually happened
At Battery Day (Sep 2020) Musk said the Kato Road 4680 pilot plant would reach a 10 GWh/year capacity in about a year. The pilot line never got there — it stayed a development facility. But the substance arrived roughly three years late elsewhere: Tesla's Giga Texas 4680 lines scaled past a 10 GWh/year run rate by 2024 (its 100-millionth 4680 cell was announced Sep 14, 2024, ~15-17 GWh annualized), and output kept growing into 2026. Graded partial: Tesla did reach 10+ GWh/year of 4680 production, but not via the pilot plant the claim named and about three years late. Electrek — Tesla's 100-millionth 4680 cell (~15-17 GWh/yr rate), Sep 2024 ↗
The Progression
Sep 22, 2020
The promise: “It will take about a year to reach the 10 gigawatt hour capacity.” · Tesla Battery Day, Sept 22 2020 (official Tesla YouTube channel, verified via YouTube oEmbed) 50:47 ↗
Sep 14, 2024
Partial — 3.0 years late. At Battery Day (Sep 2020) Musk said the Kato Road 4680 pilot plant would reach a 10 GWh/year capacity in about a year. The pilot line never got there — it stayed a development facility. But the substance arrived roughly three years late elsewhere: Tesla's Giga Texas 4680 lines scaled past a 10 GWh/year run rate by 2024 (its 100-millionth 4680 cell was announced Sep 14, 2024, ~15-17 GWh annualized), and output kept growing into 2026. Graded partial: Tesla did reach 10+ GWh/year of 4680 production, but not via the pilot plant the claim named and about three years late. Electrek — Tesla's 100-millionth 4680 cell (~15-17 GWh/yr rate), Sep 2024 ↗
Today · Jul 16, 2026
Status: Partial · 3.0 years late. Sort of happened.
At Battery Day in September 2020, Musk said the Kato Road 4680 pilot plant would take 'about a year' to reach 10 GWh of annual cell capacity. Sixteen months later Tesla had produced about one million 4680 cells in total — on the order of 0.1 GWh — and 4680 output remained the bottleneck for Cybertruck years later. The 100 GWh by 2022 and 3 TWh by 2030 targets from the same slide deck fared no better.
Receipts
LAST CHECKED 2026-07-05- [VIDEO] Tesla Battery Day, Sept 22 2020 (official Tesla YouTube channel, verified via YouTube oEmbed) @ 50:47
- [TRANSCRIPT] Rev.com Battery Day transcript — Musk: 'it will take about a year to reach the 10 gigawatt hour capacity'
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