Enphase Energy Detailed Data Center Power Buildout Could Double Its Addressable Market as Europe Turns Into a Battery-Led Growth Story
Q2 2026 earnings call, July 28, 2026
Enphase Energy used its second-quarter call to give investors the most detailed look yet at IQ SST, its solid-state transformer platform aimed at AI data centers, while also showing that Europe has become the company's most reliable growth engine even as the U.S. residential solar market remains stuck in a multiyear reset. Revenue came in at $291.9 million, up 3% sequentially, but the headline numbers mask a much bigger story: management believes it has found a second act in medium-voltage power conversion for hyperscale data centers, a market that could ultimately dwarf its legacy residential solar business.
IQ SST: The Data Center Pivot Gets Real
CEO Badri Kothandaraman spent a significant portion of the call walking through technical progress on IQ SST, a solid-state transformer designed to convert 13.8 kV or 34.5 kV medium-voltage AC directly to 800-volt DC for AI compute racks. The pitch is that rack power densities are moving from roughly 150 kilowatts today toward 1 megawatt and beyond, and conventional transformer architecture cannot keep pace. "Delivering power at that scale will require a fundamentally more efficient, responsive and reliable way to move medium-voltage power directly to the compute rack," Kothandaraman said. The company is targeting approximately 98.5% efficiency, five-nines reliability, and sub-millisecond response time, the last of which Kothandaraman called the key differentiator versus competitors also chasing this market. The claim is that SST's speed could allow hyperscalers to centralize battery storage in the data center's back-of-house black space rather than placing batteries beside every rack, which would free up valuable white space and, in Enphase's telling, effectively double its addressable data center opportunity by requiring a second SST for the battery storage system itself. For customers unwilling to change their existing architecture, Enphase has also engineered a DC-DC configuration using the same power module to serve batteries closer to the rack. Engineering progress appears real, not just aspirational marketing. The team, now roughly 120 engineers, has demonstrated 15 power modules operating in series at a 4.16 kV AC stack, completed its medium-voltage transformer lab, and validated the transformer design, which Kothandaraman said has already generated meaningful intellectual property. Chief Products Officer Raghu Belur added color on why the reliability pitch resonates with hyperscalers, noting the architecture is "fully distributed" with hundreds of power modules each undersubscribed by about 10%, and pointed to the company's track record of nearly 90 million microinverters shipped with a 500 DPPM failure rate as proof points customers care about. The commercial timeline remains multiyear: a fully working system is expected later this year, customer pilots begin in 2027, and commercial shipments start in 2028. Engagements have reportedly advanced to RFI and RFP stages representing "multiple gigawatts" of potential demand, though management was careful not to attach dollar figures or margin targets, other than confirming that 45X production tax credits should make the business "highly profitable" once volumes ramp. Investors should treat this as a call option rather than a near-term earnings driver, but the level of technical specificity offered this quarter, including transformer IP and series-stack demonstrations, suggests the platform has moved well past the concept stage.
Europe Is Now a Battery Market, and Enphase Is Leaning Into It
While the U.S. story remains choppy, Europe delivered the quarter's cleanest growth signal, with revenue up 35% sequentially and sell-through up 30%. Kothandaraman was unusually direct about the structural shift underway: "As we have discussed, Europe is increasingly becoming a battery-led market as self-consumption, dynamic tariffs and VPPs gain importance." The Netherlands is the standout, with battery activations up roughly 102% quarter over quarter as export penalties rise and net metering phases out entirely at the end of 2026. Enphase is running six homeowner events per week in the Netherlands, each attracting around 150 households with a reported 50% conversion yield, and is funneling those leads to installers through a newly built inside sales team. France showed similar dynamics, with battery activations up 34% sequentially as falling feed-in tariffs push new solar customers toward self-consumption. Germany grew more broadly, with microinverter and battery activations up 35% and 27%, respectively. This organic demand-generation model, layered on top of a combined 900,000-customer installed base in the Netherlands and France, is arguably as important as any single product launch, since it gives Enphase a direct-to-consumer channel that does not depend entirely on distributor sell-in. Management guided to roughly flat sequential European revenue in the third quarter due to seasonal summer softness, but flagged the Netherlands net-metering deadline as a catalyst for a sharper ramp starting in the fourth quarter.
Safe Harbor and TPO Backlog Provide Multiyear Revenue Visibility
Enphase has now signed $1.1 billion in year-to-date safe harbor agreements with third-party owners, split between $202 million under the 5% ITC method and $878.6 million under the Physical Work Test, or PWT, method. Management was explicit that none of the PWT revenue has been recognized yet and does not expect to recognize it until 2028, since the underlying tax credits remain valid through the end of 2027 and TPOs will need to draw down that safe-harbored inventory only once other financing options are exhausted. This creates a lumpy but visible multiyear revenue tail, and CFO Mandy Yang guided to $75 million of safe harbor revenue in the third quarter and $61.2 million in the fourth, bringing full-year safe harbor recognition to $136.2 million for the back half alone.
U.S. Resi Remains the Weak Link, With Financing the Real Bottleneck
Excluding safe harbor, U.S. revenue declined sequentially as the company deliberately under-shipped into the channel to work down slightly elevated microinverter inventory. U.S. sell-through fell 7% quarter over quarter and remains down 34% year over year, a figure still reflecting the post-25D tax credit hangover and elevated interest rates. Third-party data cited by the company showed residential solar permits up only 4% month over month in June and still roughly 30% below prior-year levels, though commercial solar permits jumped 36% year over year, a data point management leaned on to justify optimism about its small commercial push. Perhaps the most candid moment of the call came in response to a question from Roth Capital's Phil Shen, who pressed on whether Treasury's delayed FEOC effective-control guidance, potentially not arriving until the first half of 2027, could keep tax equity tight and the resi market challenged well into next year. Kothandaraman did not dismiss the risk, acknowledging "limited visibility on the treasury guidance," but argued Enphase is not waiting on policy clarity to drive growth, pointing instead to its Propel prepaid lease financing product, the upcoming fifth-generation battery, and commercial and data center expansion as self-directed growth levers.
Propel Financing Is Scaling, but Slowly
Propel, the company's third-party-ownership financing offering built with SolSource Solutions, TriBeam Financial, and Greentech Renewables distribution, is running at approximately 200 originations per week, roughly flat versus last quarter, though Kothandaraman noted the run rate has ticked up in recent weeks. The program has expanded from four states to six, with plans to reach 12 by the end of the third quarter, and battery attachment within Propel is running at 75%. SolSource is targeting 500 originations per week by year-end, a target management attributed to state expansion and financing warehouse capacity rather than demand constraints. Investors should note this is still a modest base of business in absolute terms, and the timeline to scale has been pushed out before.
Tariff Relief Is a Real Margin Tailwind
Reciprocal tariff impact on gross margin has fallen from 5% a year ago to 2% currently, and the company received $52 million in IEEPA-related tariff refunds from Customs and Border Protection in the quarter, with another $11 million collected after quarter-end. GAAP gross margin of 60% in the second quarter was inflated by these one-time refunds; the more representative non-GAAP gross margin was 46.8%, up from 43.9% in the first quarter. Management guided third-quarter non-GAAP gross margin to a range of 44% to 47%, still including roughly 2 percentage points of reciprocal tariff drag.
New Product Cadence: G5 Battery, Commercial Storage, and Bidirectional EV Charging
The fifth-generation IQ Battery, shown at Intersolar Munich, is designed with 100-ampere prismatic cells to deliver 50% higher energy density than the fourth-generation product at roughly 40% lower cost per kilowatt-hour, with shipments planned for the fourth quarter. On the commercial side, the company's IQ Vault 80 targets both 208-volt and 480-volt three-phase commercial applications, scaling up to 2 megawatt-hours across 25 cabinets, with initial shipments slated for the first quarter of 2027. Management also disclosed it expects roughly $10 million of small commercial U.S. revenue in the third quarter, a figure Kothandaraman said should grow "from strength to strength," partly aided by the FCC's newly announced plan to restrict Chinese inverters, which primarily affects the commercial and utility-scale segments rather than residential. On EV charging, Enphase is collaborating with three U.S. automotive OEMs and one European OEM on its bidirectional DC charger, with pilot shipments targeted for the fourth quarter alongside vehicle launches from one U.S. and one European partner, contingent on compliance testing.
Guidance and the Under-Shipment Debate
Third-quarter revenue guidance of $290 million to $320 million implies roughly 5% sequential growth at the midpoint, with $75 million of that from safe harbor. Management guided to 10% sequential sell-through growth but is still assuming a modest $15 million under-shipment relative to sell-through as it continues managing channel inventory conservatively. Battery shipments are guided to 130 to 150 megawatt-hours. Goldman Sachs analyst Brian Lee pushed back on the pacing, questioning why the company would continue under-shipping if demand is genuinely improving; Kothandaraman's answer boiled down to channel discipline after a period of elevated microinverter inventory, with core U.S. revenue growth of roughly 10% quarter over quarter once safe harbor is stripped out.