This will allow us to continue to work with them on projects that Elon mentioned like Terafab and Digital Optimus. We continue to benefit from our relationship with SpaceX, and we've — they've been a great partner, and we have numerous beneficial transactions with them. The next question is going to come from Colin at Wells Fargo. I guess what milestones should investors be watching from here that would cause you to accelerate your fleet scaling or market deployments? I think ultimately, as Ashok said in his opening remarks, we really focus on the performance of the vehicle. And maybe just my follow-up on robotaxis. Just to add to Elon's point, the Samsung fab that's going to be pretty significantly dedicated to future projects.
For the Optimus robots to build the hypothetically, an it might not be hypothetical in the future. Thanks so much for taking the question. Our next question comes from Andrew from Morgan Stanley. Initially, obviously, we have over $44 billion of cash and investments on the books. Your third part of your question was, how are we going to fund it? Especially if you have to do a chip fab and we have to do a solar cell manufacturing fab.
These payments are subject to the fulfillment of performance standards by the concessionaire as required by the relevant schedules of the concession agreement. Make sure that we can continue to build batteries and robots and AI chips no matter what happens. Hopefully, Micron will have something going in a few years because they are headquartered in Idaho, where they make a lot of potato chips. Elon, you've been spending significant personal time on Tesla, Inc.'s chip design. We obviously have cars operating with no one in them and no safety monitor and no follow car or anything like that in Austin right now. I think some customers took rides last week and also service continues today without any real cars, something like that.
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This was the result of high deployments in all regions and continued strength in demand for both MegaPack and Powerwall. On the energy front, we achieved yet another record in terms of gross profit for the quarter and ended the year with nearly $12.8 billion in revenue, a 26.6% year-over-year growth. While our teams have been creative in trying to resolve the situation by now putting 4,680 cells in nonstructural packs, we continue to iterate improving things from here on. Our biggest constraint globally continues to be on the battery pack front. As we look to 2026, with the progress that has been made with autonomy, our focus is on ramping production at all our factories. Q was an interesting quarter in a couple of respects.
Major investments in batteries and the entire supply chain of batteries. I think all these investments make a lot of sense. As we increase vehicle autonomy and begin to produce Optimus robots at scale, we are making very big investments. Open to other ideas, but that sounds like the best future you could spanian casino possibly imagine. Making sure that the environment is great, nature is great, and people can have whatever they want, which seems like probably the best future. So I have updated the Tesla, Inc. mission to amazing abundance, and this is intended to send a message of optimism about the future. Cost basis and return based on previous market day close.
Operation Period Phase of the agreement starts on the date on which the completion certificate—or the provisional certificate—is issued to the concessionaire. The concessionaire is entitled to commence the work under the agreement on the “appointed date,” which is broadly similar to the “commencement date” under FIDIC contract forms. During phase 1 of the agreement (development period), both parties are required to satisfy their respective conditions precedent. This will enable the concessionaire to undertake and perform the obligations and exercise the rights of the winning bidder. The envelopes containing technical bids are evaluated first to ensure that bidders meet required qualifications—including technical and financial capacity requirements—before evaluation of the financial bids. Additionally, payments for O&M are made during the operation period based on the quoted bid price for O&M, adjusted for inflation.
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When I look ahead at what's the limiting factor for Tesla, Inc. growth if you go three or four years out, I think it actually is chip production. When we do training, it's a combination of the AI4 chips and NVIDIA hardware. We already use the AI4 chips in our data centers. We will actually use the AI5 chips in our data centers. In terms of selling it outside of Tesla, Inc., we first need to make sure we have enough chips for our vehicle production, all of our Optimus production. I feel pretty good about our chip strategy right now.
We continue to expect that CapEx for this year will be more than $25 billion. As previously guided, our free cash flow ended up being negative for the quarter. Note that we are in a big investment cycle and expect our operating expenses largely driven by R&D to continue to grow in 2026 and beyond. Additionally, we had charges related to litigation expenses in the quarter. We continue to grow the Tesla Robotaxi fleet and have expanded to a total of seven markets in the U.S. First, there was a warranty true-up in the quarter of about $240 million related to certain vendor cell issues for our legacy deployments. In Q2, we deployed 13.5 gigawatt hour of energy storage, a 53% sequential increase and the second largest quarter for energy business. Commodity price increases and interest rate changes all continue to add to our costs.
