Energy
A Tesla Powerwall-powered Home: Will it Pay Off?
We’ve all heard by now that the Tesla Powerwall home battery is designed to store electricity, generated from solar panels and electricity captured from utility companies during off-peak rates, and provide overall independence from the grid.
It sounds like an amazing product, and I’m sure it is, but will it pay off to own one?
Understanding the Powerwall
The Powerwall is an energy storage unit otherwise known as a battery. It comes in two sizes today (although they can be stacked/expanded), 7kWh and 10kWh (what’s a kWh?) and costs $3,000 and $3,500, respectively. Note that the cost excludes an inverter and installation, both of which can be quite expensive to the point it can double the total out-of-pocket cost. The specs for the Powerwall come in at a whopping 220 lbs / 100 kg (unclear as to which capacity this represents) and 52.1″ x 33.9″ x 7.1″ or roughly 3.5 x 3 feet in dimension.
The concept is simple, the Powerwall battery stores energy generated through your utility company when rates are the lowest (or through solar panels) and ready on tap when you need it.
Installation
Tesla notes that the cost of the Powerwall does not include the inverter or installation. An inverter alone such as the one SolarCity uses can cost around $2,000 which does not include a separate installation cost.
Installation will vary depending on the following:
- Does your residence have an existing net metering?
- Is it already wired for a generator?
- What is the distance between the photovoltaic solar panel hardware and the location to where Tesla’s Powerwall would be mounted? The shorter the distance, the less cabling to run and thus a lower installation cost.
At 200+ pounds in weight, you’ll need to ensure that there’s ample space and structural support to where the Powerwall will be installed. There also needs to be sufficient cooling space and ventilation in the mounting location.
Primary Use Cases for the Tesla Powerwall
Tesla proposes two primary use cases for the Powerwall:
- Time of Use (TOU) offset
- Backup power
Let’s explore each of these options.
Powerwall provides a Time of Use offset
In many states and countries from around the world, a Time of Use (TOU) electricity rate is available through the local utility company. The concept is simple: you pay different rates at different times of the day. During peak hours the rates are higher than they are during off hours. Many Tesla owners that live in these areas that have TOU pricing will charge their cars during the evenings when rates are typically the lowest.
Unfortunately TOU pricing is not widespread here in Massachusetts but if you’re able to take advantage of it in your area, then the Powerwall may bring some value although it would take quite awhile to recoup the initial investment.
Taking a look at TOU rates from Southern California Edison, we can see that their off-peak rate is $0.11 while peak rate comes in at $0.46 for a difference of $0.35 per kWh. The large Powerwall unit is capable of storing 10kWh. Assuming you are able to fully charge the battery during off-peak hours each and every day, you would save approximately $3.50 per day.
Since the unit itself (without install) costs $3,500, it would take approximately 1000 days or just shy of 3 years before you “broke even”. This is assuming the utility company continues to offer off-peak rates throughout the year. Add in the installation costs and you’re looking at closer to 5 years before breaking even on the Tesla Powerwall investment
Of course, there’s the argument that having a solar panel system would allow you to charge the Powerwall battery for free through sunlight, but only if you fully ignore the cost of the solar system itself.
RELATED >>> My journey to installing a SolarCity system
Owning or leasing a solar system comes with its own break-even calculations so you’ll have to factor that into the equation with the Powerwall.
Powerwall provides backup power
The other stated potential use case for the Powerwall is to use it for backup power in the event your home power is completely cut off from the grid.
Source: SolarCity
Don’t expect to power your entire house with just a single 10kWh Powerwall. Tesla’s site provides some good examples of how much power common home appliances draw. For instance the Powerwall would be able to power a typical refrigerator for 2 days. This time would of course be extended if you were able to replenish the battery through a solar system.
In the case of an extended power outage (think Zombie apocalypse), you may be able to power essential home services indefinitely with a properly sized battery and solar system.
The ability to re-fill from solar is a nice benefit, but the alternative would be a noisy gasoline powered generator.
A 6.5kW generator can be had for for as little as $800. That generator can output 32,500kWh (50% load x 10 hours according that link). That’s 3x the power at less than 25% of the cost of Tesla’s offering. The cost for that power? About $15. The generator, unlike the Powerall, is mobile and can go anywhere you go. Generators typically have very low maintenance and can be re-filled quickly regardless of weather conditions (hurricanes, snow storms, etc – all likely conditions that will cause loss of power).
I have a Honda 6.5kW generator. My house has its own well, septic etc. When power goes out I fire up the generator and power the things I need. I have water, hot showers, heat (oil, fired by electric which is powered by the generator), lights etc. I have run for days off that generator in some of the worst weather conditions New England can throw at me. I’d argue if you’re serious about backup power, then a generator is still the best option.
Powerwall, as a backup power option and also from a pure cost-perspective, I feel is only a good fit for those who have a solar system installed and live in an area where the climate is more stable.
Elon Musk
Google just picked SpaceX for its first step into orbital AI
Google will launch its first Project Suncatcher AI satellite on SpaceX’s Transporter-18 rideshare next week.
Google is about to put its own AI chips into orbit for the first time, and it is paying SpaceX to get them there.
The company said Thursday that the first in-orbit test of Project Suncatcher, its research effort to find out whether space can host large-scale AI computing, will fly next week on SpaceX’s Transporter-18 rideshare mission.
The satellite, called MVP, is about the size of a refrigerator and carries four of Google’s Tensor Processing Units, the same chips Google runs in its ground data centers. Google originally planned to launch two custom satellites in 2027, but chose to move faster by integrating its chips into a satellite.
MVP’s solar panels supply about one kilowatt of power, and Google will run Gemini models on the TPUs only in bursts of roughly 15 minutes before the chips shut down so the radiators can shed heat. In a blog post, Google said its Trillium TPUs survived vibration testing that mimicked sustained launch loads of up to 10g, with individual components seeing 50 to 100g, and handled a radiation dose greater than a five year mission would deliver.
SpaceX and Google mull massive partnership on Musk’s orbital data dream: report
Next week’s flight, slated for October 1, follows a relationship that became public in May, when Teslarati reported that Google was in talks with SpaceX for a launch deal tied to orbital data centers. Google also holds a stake of roughly 6% in SpaceX.
The two companies are chasing the same idea from very different starting points. SpaceX’s own orbital compute program is built around the AI1 satellite, a roughly 70 meter structure derived from Starlink V3 hardware that is designed for 150 kW of peak compute, about 150 times the power MVP will draw. Elon Musk has brushed off concerns about crowding orbit with those satellites, and SpaceX is building its Gigasat factory in Bastrop, Texas, to produce them, targeting an annualized rate of about 1 GW of space compute by the end of 2027.
Musk also posted on X on Thursday that “the amount of compute in space will obviously round up to 100% of all compute.”
Google has been more cautious in public. Its research estimates that launch prices need to fall below about $200 per kilogram before an orbital data center can compete with a ground facility on energy cost, a threshold the company believes could be reached around the mid 2030s. The Suncatcher team has said it expects the effort to remain a project rather than a product for years, which leaves the first real test of its hardware riding on a rocket from the company with the most aggressive timeline in the field.
Energy
Tesla Semi factory is getting a celebration nobody expected
Tesla will inaugurate its Nevada Semi factory September 24, five months after production quietly began ramping.
Tesla says it will officially inaugurate its new Semi factory in Nevada next month. The Tesla Semi account posted the announcement on X, sharing a graphic titled “Semi Rollout” with a date of September 24. No further details were given about the format of the event or who would attend.
While Tesla’s dedicated Semi plant in Sparks, adjacent to Gigafactory Nevada, opened back in April, with the first trucks rolling off the high volume line on April 29, the timing for the factory inauguration comes at a surprise. The ribbon cutting event five months into production is a break from how Tesla has usually handled its other factories, where the first truck or car off the line typically served as the milestone moment.
Inauguration of new Semi factory in Nevada next month pic.twitter.com/a8kAlxrOOn
— Tesla Semi (@tesla_semi) August 24, 2026
The 1.7 million square foot factory was built as part of a $3.6 billion expansion Tesla announced in early 2023, and it shares a site with the battery cell lines that feed the Semi’s structural pack, a decision meant to remove the supply bottleneck that delayed the truck for years. The plant is designed for 50,000 trucks a year at full ramp. Semi program director Dan Priestley has said production “is now ramping” rather than claiming it has reached scale.
Nine years passed between the Semi’s 2017 unveiling and this stage of production, with the truck slipping from an original 2019 target through hand built pilot units for PepsiCo and a slow build out of the Nevada plant. An inauguration event now gives Tesla a stage to talk up that ramp and reset expectations for how many trucks it can begin delivering at scale.
The September date also lines up with the Semi’s next milestone. Tesla confirmed the truck is heading to Europe with a full unveiling at the IAA Transportation trade show in Hannover, Germany, running September 15 through 20. Between the Nevada event and the Hannover reveal, Tesla has roughly a week and a half in September to make the case that the Semi is now a truck being built and sold on two continents rather than tested in a handful of fleets.
Tesla Energy has introduced the Powerwall Lease in conjunction with Tesla Electric, making the service available in Texas. This new option delivers whole-home backup power using two Powerwall units for a net monthly cost of $35 after credits, accompanied by a low fixed electricity rate.
Under the lease terms, customers pay a one-time order fee of $100. The base lease payment for the two Powerwalls is approximately $122 per month during the first year, subject to a 3 percent annual escalator thereafter. Enrollment in a qualifying Tesla Electric Backup plan or Virtual Power Plant plan provides an $87 monthly credit.
Powerwall Lease is now available with Tesla Electric in Texas
Whole-home backup for $35/month, with a low fixed electricity rate
– Two Powerwalls, $0 installation
– Storm Watch outage protection
– One app to manage it all pic.twitter.com/oTzqc6K3aF— Tesla Energy (@teslaenergy) August 13, 2026
This credit lowers the effective cost to roughly $35 per month plus applicable tax.
Installation of the standard system carries no additional charge. The package features Storm Watch for outage protection and allows complete management through a single Tesla application. The system supplies continuous whole-home backup capability.
The Powerwall system enables households to maintain electricity during severe storms that disrupt the utility grid. When outages occur, the batteries automatically provide seamless backup power to the home.
Tesla announces 100k Powerwalls are participating in Virtual Power Plants
Tesla Storm Watch monitors weather forecasts and ensures the units are fully charged ahead of anticipated severe weather events so that power remains available throughout the disruption, keeping lights, refrigeration, and other essential systems operating without interruption.
Availability is restricted to select Texas locations where retail electric choice exists. Participants must lease exactly two Powerwall units and maintain continuous enrollment with Tesla Electric. Solar panels cannot be included under this particular lease arrangement.
The monthly credit activates automatically once the system is installed, receives permission to operate, and enrollment is confirmed. To retain the credit, customers are required to stay enrolled in Tesla Electric and fulfill all program conditions.
Nonstandard installations that involve electrical upgrades or special permitting may lead to extra expenses and might impact eligibility for the credit, so be sure to check with either your installer or Tesla to ensure you will still qualify.
Elon Musk’s AI Grok Bot can now handle banking while your Tesla FSD handles the road
SpaceX just got the green light Starship has waited years for
