Stem Q1 2026 Revenue Falls 11 Percent and Hardware Sales Effectively Disappear, Completing the Largest US Commercial Storage Incumbent’s Exit From Hardware

Stem reported first-quarter 2026 revenue of $29.0 million on May 6, down 11 percent from $32.5 million in the year-ago quarter. Software, services, and edge hardware accounted for substantially the entire figure, with the legacy battery hardware reseller business contributing close to nothing. The stock fell roughly 26 percent in after-hours trading.

Two months ago this publication covered Stem’s first profitable quarter in Seven Million Dollars and the Margin Migration, framing the result as evidence that BESS value was rotating from hardware to software as cell prices fell. Q1 2026 is the next chapter of that story, and it is a more violent one than the prior quarter implied. The hardware line did not migrate. It collapsed.

The numbers. Reported revenue of $29.0 million compares with $32.5 million in Q1 2025, an 11.0 percent decline. PowerTrack software revenue grew 16 percent year over year. Annualized recurring revenue reached $41.7 million. GAAP gross margin expanded to 38 percent from 32 percent a year earlier, a function of the low-margin hardware mix exiting rather than software margins improving. Cash burn continued. The 26 percent post-close drop in the stock priced in the revenue miss, not the margin expansion.

What Stem now sells. The product Stem is selling in 2026 is PowerTrack, an asset-management software platform aimed at solar and storage developers operating utility-scale and large commercial portfolios in the 20 to 100 megawatt range. The pitch is portfolio optimization, dispatch, performance monitoring, and revenue assurance. It is not a battery. It is not a project. It is a SaaS layer that sits on top of assets other people own.

This is a different company than the one that went public via SPAC in 2021 promising to be the dominant platform for behind-the-meter commercial and industrial storage. The C&I hardware reseller model, which once anchored Stem’s narrative and revenue, has been quietly removed from the income statement. Q1 2026 is the quarter where the absence becomes obvious.

The competitive vacuum. Stem at peak was the largest US incumbent in commercial and industrial behind-the-meter storage by deployments and pipeline. Its retreat from hardware does not mean the C&I storage opportunity disappeared. It means the legacy-incumbent overhang on the category disappeared.

The question is who fills the space. Several signals point to a fragmented answer rather than a single replacement. Generac and CPower’s EnergyCore product, announced in April, bundles backup-grade hardware with virtual power plant participation. Vertiv recently extended a similar partnership into commercial portfolios. Inverter manufacturers are entering directly: SolarEdge launched a 197 kilowatt-hour outdoor commercial cabinet in Europe last month, built explicitly around peak shaving and tariff optimization, with US availability implied. Indoor-certified entrants, including Viridi with its new UL 9540 listing for a 480-volt indoor system and Moment Energy with its $40 million Series B for indoor-rated second-life cabinets, are filling the certification gap that Stem’s outdoor-only product lineup never addressed.

None of these are the next Stem. They are seven or eight different bets on what the post-Stem C&I storage product looks like.

The financing read-through. A profitable software business trading at a 26 percent post-earnings discount changes how project finance underwrites C&I storage cash flows. Stem’s pivot was the bull case for software-led BESS value capture. The market just downgraded that bull case in real time.

For developers raising capital against C&I storage portfolios, the implication is that financiers will demand contracted demand-charge savings and capacity-market revenue rather than software optionality. That is a tighter underwriting standard than the 2024 to 2025 vintage, when storage software ARR was an acceptable proxy for cash flow durability. It is also a standard that favors products with measurable bill-line savings over products with platform stories.

Sunrun’s Q1 results, also reported May 6, illustrate the contrast. Sunrun posted $722 million in revenue, up 43 percent year over year, with storage attached to 73 percent of new installations and 4.3 gigawatt-hours of cumulative networked capacity across 251,000 systems. The full-year cash generation guidance is $250 million to $450 million excluding safe-harbor benefits. The number Wall Street is rewarding is networked storage capacity feeding measurable distributed cash flows, not platform ARR.

Wood Mackenzie’s reallocation thesis. Wood Mackenzie’s 2026 storage outlook, restated this week, projects an 11 percent contraction in US utility-scale battery installations in 2026 and a further 8 percent decline in 2027, driven by tariff exposure, FEOC compliance friction, and OBBBA tax-credit timing uncertainty. The same outlook flags grid-forming inverters, alternative chemistries, and data-center storage as the structural growth lanes.

A two-year contraction in utility-scale storage rotates EPC labor, cell allocation, and developer balance sheets toward distributed and behind-the-meter applications where supply-chain friction is lower and procurement cycles are shorter. Stem’s exit from C&I hardware happens at the moment that capital and installer attention is rotating into the lane Stem is leaving. The category is not shrinking. The dominant player is no longer in it.

A specific reading of what changed in Q1. PowerTrack’s 16 percent year-over-year growth is the Stem the new Stem can be: a software platform for developers operating contracted portfolios. The 11 percent total revenue decline is the obituary for the Stem that was: an integrator selling third-party batteries into commercial customers paying retail demand charges. The two are not the same business, do not serve the same customers, and do not compete in the same competitive set.

The 26 percent stock drop suggests the public market is still pricing the company as a single business. That is worth watching. If management’s next two quarters confirm that PowerTrack ARR can grow 20 percent or more on a clean software cost base, the equity story will eventually re-rate. If ARR growth slows into the teens while cash burn persists, the question shifts from “what is the multiple” to “is there a buyer.”

Either outcome leaves the same hole on the C&I commercial storage product side. The companies racing to fill it are smaller, more specialized, and individually less ambitious than Stem at peak. Collectively, they will determine whether the next phase of behind-the-meter storage looks like a platform business or a hardware business.

The Q1 2026 income statement says it is a hardware business again, and the largest software-first incumbent just stopped pretending otherwise.

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