Adjusting Tesla Texas Megapack Production Start Estimate

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Information from someone who lives and works in the area, online transcripts from the public meetings and public reports, Grok 3 analysis (based upon my giving it my view of the context to get to first megapack production at the new megapack factory in Texas gives this 9 month timeline.

– 8-10 month timeline likely
– 1.77 million sf of building. 1.03 million building getting converted. Other building being built. More buildings could getting leased or bought.
– main critical path bottleneck is the power upgrades that are needed inside and outside

The City of Katy is not involved in this project in any way. The County of Waller and the City of Brookshire are the only local governing bodies involved in this undertaking. The EPA and the State of Texas will also be heavily involved.

Retrofit: there are 206 overhead doors that have to be removed and the openings closed off. Tesla has access to premier construction teams, but this is still a major undertaking.

Starting time: The warehouse currently has approximately 10,000 completed batteries that need to be removed prior to any retrofit beginning. There are also nearly 44 million battery cells on pallets that need to be relocated. Give or take 40,000 square feet of auto parts are in the building 111 Empire. The staff for loading and unloading trucks has been reduced to the bare minimum. An guesstimate is that mid to late June before the building is empty. The facility is still receiving freight, which works against clearing the building of all products. The facility recently received several loads of freight into the building.

The building will not be empty until June (unless there is a massive speedup in clearing operations). This is based on how many people are available to load trucks for the outbound products. This is also allowing for receiving additional products. This shifts your timeline by several months. This would make pre-production later Dec 2025-Feb 2026.

The main project timeline for converting the warehouse at 111 Empire Boulevard in Brookshire, Texas, into Tesla’s third Megapack factory looks like about 6 months. There could be 3 months of delay for the roofwork and clearing the building.

Main Issues and Mitigations

Fixing the roof (206 doors) and clearing the warehouse.
Power Delay Risk: The biggest hurdle. Tesla could mitigate this by leasing temporary generators (as done at Giga Texas) or pushing CenterPoint for priority service, leveraging its economic impact (1,500 jobs).
Supply Chain Hiccups: Unlikely, given Tesla’s U.S. network, but global shipping delays could push equipment installation back by 1–2 months.
Regulatory Surprises: Low risk in Texas, but any unforeseen environmental pushback could add 1–2 months. Waller County’s proactive stance minimizes this.

Estimating 8-10 Months to First Megapack
The conversion of 111 Empire Boulevard into a Megapack factory would take 5–6 months from March 8, 2025, with trial production starting between August and September 2025. However, there is roof work and clearing the warehouse which could delay work by 3 months. So 8-10 months. The main issues are clearing the warehouse, fixing the roof, utility power readiness, which could stretch the timeline if not pre-planned, but Tesla’s experience and Texas’s business-friendly environment should keep delays minimal. Most regulatory hurdles are cleared, with only routine permits remaining, likely processed concurrently with construction.