Sunrun: Solar Stock Teaming Up With Tesla?
Video: Let's talk about Sunrun and the solar industry at large.
Transcript
Sunrun (RUN) is the largest residential solar and battery installer in the United States. Currently sporting a market cap of approximately $3 billion.
They just signed a deal with Tesla and Renew Home to create a “virtual power plant,” which essentially just means they are coordinating thermostats and batteries in thousands of homes to shift energy usage. Creating a source of energy for data centers during peak demand hours.
In this video I’ll provide an overview of SunRun’s investment case, the deal with Tesla, and my thoughts on how appealing the stock is.
Starting off with their business model, SunRun designs, installs, owns, and maintains residential solar and battery systems. It was founded in 2007 in San Francisco to carve a niche in the solar space. The problem they set out to solve was that most homeowners could not or would not pay $20,000 to $40,000 dollars upfront for solar panels.
So Sunrun pioneered the “solar-as-a-service” model, where Sunrun owns the solar panels on your roof and you sign a roughly 20+ year long agreement to buy the power they produce, usually at a rate below what utilities charge. The consumer gets a lower power bill with no upfront cost, and Sunrun gets a multi-decade-long, guaranteed cash flow stream. This model makes up 65% of their revenues.
The second portion of their business involves just selling the energy systems and hardware outright. This makes up a smaller but still significant 35% of the company’s revenues.
Building solar panels and batteries is obviously not a capex-light business, so they have been funding expansion through debt financing. As well as taking advantage of tax credits and other government benefits.
The Big Beautiful Bill is a problem for the solar industry as it eliminated the 30% Section 25D residential tax credit. Which covered 30% of the gross installation costs for the consumer. Since that was slated to end in December 2025, that pulled installation demand forward through that year. So, that could dampen future demand for some time.
With that said, this might’ve actually benefited Sunrun, since the Section 48E tax credit for leased and third-party systems remains in place. So, since Sunrun operates with the solar-as-a-service model and owns the solar panels themselves… this actually benefits the company. Their competitors are hurting far more than Sunrun is.
Additionally, Sunrun sports a 73% battery storage attachment rate in their installs, nearly three out of four customers have a battery. This plays into the partnership with Tesla and Renew Home.
All of those batteries can be used to create virtual power plants, allowing them to control when to feed that leftover electricity back to the power grid during peak demand hours. Customers have to opt-in for their battery to be used, but they do receive some cash for doing so. There’s a good chance many homeowners would take the additional cash flow. Sunrun has 1.1 million customers and the largest residential battery base in the United States. They and Tesla combined cover a large portion of the solar market share that can be utilized for powering data centers.
In total, this deal includes Renew Home’s 8 million theomostats and potentially over 16 GW of flexible capacity that can be sold back to hyperscalers. This should lead to higher revenue potential than the previous efforts to sell excess power to standard utilities. It’s difficult to saw how much of that 16 GW can actually be allocated immediately, the number is likely significantly lower. Analysts estimate around 4 GW of that capacity is actually firm battery supply.
Moving onto the competitive landscape of the solar industry… there are obviously a large amount of competitors. Granted, the industry is reaching a point of consolidation and some competitors are being driven out of the market over policy changes. SunPower, one of the oldest solar companies in the United States, went bankrupt in 2024.
The most relevant competitors for Sunrun are Tesla Energy, Freedom Forever, and Palmetto.
Tesla Energy is the most important rival and also, awkwardly, Sunrun’s biggest new partner. Tesla competes on the hardware side of the business while being an ally on the grid side. Tesla is the main threat, as their business can be subsidized by profits from automotives and AI. Especially if Tesla were eventually merged into SpaceX, along with Elon’s other companies. Meanwhile, Sunrun is just a pure-play in the solar industry.
Freedom Forever and Palmetto have both been gaining market share.
So, with an industry that has various competitors, does Sunrun have any real moat? Not really. The hardware is commoditized; any solar developer can offer the same long-term financing model.
With that said, being the largest operator in the space does give them economies of scale for financing and operational cost reductions. Having the largest customer fleet of residential solar panels also gives them switching-cost benefits now that so many homes have already been serviced.
I don’t find either of these moats particularly compelling, but they are worth mentioning.
Sunrun has roughly 238.5 million shares outstanding as of March, 2026. This is a single class of common stock so the voting and share structure is simple.
In terms of dilution, over the last year, they diluted roughly 4% since the previous share count in March, 2025 was 228 million. So, they added 10 million shares over the span of a year. Not surprising.
There are currently around 3 million options outstanding, with a few million RSUs being granted per quarter. The company does issue some convertible senior notes as well, so that debt can convert into additional diluted shares. Overall, not a crazy level of dilution from what I’ve seen.
Insiders only own 2% of the company and pretty much consistently sell stock every single month. Which is not what we want to see as shareholders. Not exactly instilling confidence. At this point, the stock is mainly owned by institutional investors, which make up 93% of the investor base via share count.
When looking at the Q1 financials, revenue was $722 million, up 43% year over year and well above analyst expectations. Net income attributable to common stockholders was $167 million dollars. Gross margins came in around 32%, though operating margin was still slightly negative, at -1.7%. That tells us the profitability to common holders is being driven heavily by the financing and tax-credit structure rather than by clean operating profits.
Because they recognize the present value of future contracted cash flows from new customers, they appear profitable even as they have negative operating margins and free cash flows. The additional costs of marketing, G&A, and investing in the production of new solar panels necessitate taking on more debt to continue expanding.
On the balance sheet, Sunrun ended the quarter with $679 million in cash and total assets of $22.8 billion, including $17 billion worth of energy systems. Total debt was about $14.8 billion, $18 billion in total liabilities. $1.3 billion of that is current liabilities, so due in the next year.
So, overall, their gross margins have been improving; they’re seeing higher battery storage attachment rates as well. Revenues have been increasing nicely, benefiting from the rush to build out solar before certain government incentives ended. On the flip side, the debt profile is pretty significant, and this industry is really being propped up by tax credits and other incentives that are standing on shaky ground with Trump in office. That’s something to watch out for…
In summary, we have risks galore for this company. Capital-intensive, competitive industry, massive debt burden, profitability relies on subsidies that could be revoked at any time, no real moat, low insider ownership and consistent selling. Even if they benefit from the hype around data centers and generate some higher cash flows from selling additional power to them… I would probably never be interested in a company like this.
So, no, the flashy headline about providing power to data centers with Tesla did not sell me.
But I am just here to provide my two cents and not to provide any financial advice. So, interpret the situation how you wish. Either way, thanks for watching.
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