Tandem PV’s 30.4% tandem solar module to enter commercial sales later in 2026

Tandem PV has moved from lab demonstrations toward commercial productisation: the startup announced it shipped a “first production-quality panel” and told pv magazine USA it expects to begin revenue-generating sales later in 2026. The company’s mechanically stacked perovskite-on-silicon tandem module achieved a record 30.4% module efficiency in its demonstration hardware and is aimed first at utility-scale independent power producers (IPPs).

What exactly is launching — product type and market positioning

Tandem PV’s offering is a perovskite-on-silicon mechanically-stacked (4-terminal) tandem solar module. According to the company’s CEO Scott Wharton, the demonstration module that set the 30.4% record was built on an interdigitated back-contact (IBC) silicon cell, but the architecture is cell-agnostic and has also tested with PERC, TOPCon and HJT silicon cells. Tandem describes the shipment as a “production-quality” panel and says it expects revenue-generating paid pilot deployments with IPPs later in 2026, which will yield the outdoor field-data needed for bankability.

Is this a global reveal or a regional introduction?

Tandem PV’s statements to pv magazine USA and to Roth Capital indicate a global commercial ambition, but the company’s immediate go-to-market focus is the utility-scale IPP segment — noted as roughly 80% of the U.S. market — and discussions include selling perovskite-coated glass to existing module manufacturers. The evidence supports that Tandem’s initial sales plan targets utility-scale customers in markets where IPPs purchase modules, including the U.S. and other major markets; however, specific country-by-country availability, pricing and certification timelines are not confirmed in the material provided.

Powertrain and performance (how this module produces energy)

As a photovoltaic product, the module’s “powertrain” is its stacked two-junction design: a perovskite top absorber deposited onto glass overlays a conventional silicon cell beneath. Tandem uses a 4-terminal mechanical stack where the perovskite top operates independently of the silicon bottom, allowing each sub-cell to be optimised. In the record demonstration, roughly 22 percentage points of the 30.4% total came from the silicon cell and about 8 points from the perovskite glass layer, according to Tandem’s public comments.

Battery, range and charging (electrified vehicle equivalent)

Not applicable. The product is a stationary photovoltaic module; there are no on-module batteries, driving range or charging specifications to report.

Dimensions and practicality

Tandem’s initial record demonstration used a demonstration-format panel roughly the footprint of a First Solar Series 4 module and a 100 cm2 demo size was cited. The company says its planned high-volume products will be designed around industry-standard module footprints (1-by-2 m and 2-by-3 m formats). Tandem also suggested the company could target a 1,000 W module in future headline products if module efficiencies reach about 32% on a standard utility-scale module size (2,384 mm x 1,303 mm).

Interior / technology (module construction and IP)

Tandem PV’s module uses a glass-glass construction with a perovskite top layer applied to the glass rather than printed directly on the silicon cell. The approach is described as adding only a very small mass — CEO Scott Wharton said the perovskite adds around 5 grams of liquid equivalent to an 80-pound panel — and being compatible with a range of silicon cell types. The company emphasises that this cell-agnostic route allows buyers to source silicon domestically if they prefer, and even to purchase Tandem’s perovskite-coated glass as an unbundled product to pair with their chosen cells and assembly lines.

Safety and durability / warranty

Degradation and long-term stability are known concerns for perovskite materials. Tandem PV told pv magazine USA it plans to offer a 30-year warranty with degradation of 1% or less per year. The company reported its glass-glass modules have shown no measurable degradation after one year of outdoor testing, but long-term performance (multi-year to decade-scale) and formal bankability rely on the paid pilot deployments and roughly 6–12 months of field data the company plans to gather.

Trims, regional price and availability

Tandem described a market-driven average selling price (ASP) of $0.40/W in a Roth Capital discussion and reported letters of intent that total approximately $1 billion in panel sales, which equates to roughly 2.5 GW at that ASP. The company expects paid pilot deployments and commercial sales to begin later in 2026, with high-volume, gigawatt-scale manufacturing targeted for 2028. No region-specific pricing, certified product approvals, or concrete availability dates for the U.S., Canada, the U.K. or European markets were provided in the available material.

Market-specific differences and domestic content

Tandem emphasised that because its product uses perovskite-coated glass and treats the silicon cell as a pass-through cost, customers can select silicon cells from preferred domestic suppliers to maximise local content. Tandem’s manufacturing is positioned to qualify for domestic content and manufacturing tax credits; the company noted potential stacking of wafer, cell and module credits (Roth discussed an example leading to $0.14/W in credits). Tandem also stated recent Section 232 tariffs have minimal direct impact on its perovskite glass, though they could raise final system prices due to higher silicon costs.

Manufacturing plan and scale

Tandem PV said it shipped a first production-quality panel in mid-2026 and is overcoming engineering challenges of translating R&D processes to panels 60x larger than lab cells. The company has raised about $100 million across equity, debt and grants and lists investors including Eclipse Ventures and Constellation Energy. Tandem estimates capital expenditure of roughly $100 million per GW for perovskite glass production lines and expects to reach gigawatt-scale manufacturing by 2028 if scaling proceeds as planned.

Comparison with direct rivals

Tandem’s 30.4% module positions it materially above high-efficiency silicon modules currently available on the market (commercial top-tier silicon modules commonly run around 22–25% efficiency). pv magazine USA compared the new record to recent high-efficiency silicon cells from manufacturers such as Qcells (which reported 28.6% for a perovskite/silicon cell) and cited LONGi/Aiko products at the high end of commercial silicon module sales (around 25%).

Other companies working on tandem or hybrid perovskite products include Trina, Oxford PV and Caelux; recorded module efficiencies and roadmaps differ by firm. Tandem’s 4-terminal mechanically-stacked approach and the stated 30-year warranty ambition are notable differentiators. The company projects a path to 37% module efficiency by 2030 through incremental engineering improvements and to theoretical peaks above 40–50% with additional tandem layers, but those later targets are forward-looking company projections rather than demonstrated products.

Timeline — where we are and what to expect

1. June 2026: Tandem PV shipped what it calls its first production-quality panel and publicly discussed a 30.4% record module in interviews with pv magazine USA and Roth Capital.
2. Late 2026: Company expects to begin paid pilot deployments with IPPs and start revenue-generating commercial sales later in 2026, pending final outdoor field tests needed for bankability.
3. 2027–2028: Aim to ramp to high-volume, gigawatt-scale manufacturing by 2028; ongoing engineering to translate lab processes to full-size modules.
4. 2028 onward: If the company’s efficiency curve holds, Tandem expects to push module efficiency higher and explore larger-format, higher-wattage modules and potential unbundling of perovskite glass sales to module manufacturers.

Practical implications for U.S. buyers, installers and IPPs

For U.S. IPPs and large-scale project developers, a module with materially higher efficiency could reduce balance-of-system costs and decrease land and BOS needs per megawatt. Tandem’s cell-agnostic glass offers the practical option of pairing the perovskite top with domestically sourced silicon cells to improve eligibility for domestic content incentives; however, bankability and long-term warranties will hinge on the field data from the paid pilots and independent testing. Installers and developers should watch Tandem’s pilot programme results, warranty language, and independent reliability testing before assuming the module can be deployed at scale.

Key takeaways

• Evidence provided by pv magazine USA and Roth Capital shows Tandem PV shipped a production-quality perovskite-on-silicon module with a demonstrated 30.4% module efficiency and plans commercial pilot sales later in 2026.
• Tandem’s 4-terminal mechanically-stacked architecture is cell-agnostic and compatible with several silicon cell technologies; the company markets its product primarily to utility-scale IPPs initially.
• Tandem aims for a 30-year warranty and targets gigawatt-scale manufacturing by 2028, but long-term durability and bankability depend on upcoming field data and independent validation.

“Tandem PV shipped its ‘first production-quality panel’ two weeks ago and expects revenue-generating sales later this year,” — pv magazine USA (paraphrased from the company’s comments)