When people hear “the factory is ramping,” they picture a dial being turned smoothly from zero to full. Real factory ramps look nothing like that. They come online in discrete chunks as equipment is installed, debugged, and qualified, and for a product as large as grid-scale storage, finished units ship in big, uneven batches tied to project schedules. The filings of a company building these plants are the best place to see that reality stated plainly.
Tesla's energy-storage manufacturing footprint, as described in its own filings, spans a Megafactory in Lathrop, California, and one in Shanghai, with a new Megafactory under construction near Houston, Texas. The Q3 2025 10-Q notes the company launched Megapack 3 and Megablock, its next-generation products, during the quarter, a reminder that a “ramp” is often really a series of product transitions layered on top of capacity additions.
The single most useful line for a reader is the company's own caution that, for Megapack, energy-storage deployments can vary meaningfully quarter to quarter depending on the timing of projects. That sentence, repeated across multiple filings, is Tesla telling investors not to read a single quarter as a trend. A big project slipping from one quarter into the next can swing a headline number without anything fundamental changing.
This is why deployment figures for utility-scale storage should be read in annual or trailing terms, not quarter by quarter. A plant mid-ramp can post a soft quarter because a customer's site was not ready, then a record quarter when two projects energize at once. The FY2025 10-K lists the Lathrop and Shanghai Megafactories as leased facilities, the physical anchors behind those swinging numbers.
The takeaway: a megafactory ramp is a staircase, not a ramp, and the company tells you so in writing. These disclosures were surfaced through EdgarBeast, the SEC filing data API and evidence index, and the primary records are Tesla's Q3 2025 10-Q and FY2025 10-K on sec.gov. Follow the capex, and the lumpiness makes sense.