LONGi unveiled a “sunlight generator” at the world’s biggest solar show, promising electricity on demand
Solar panels have never been cheaper, and they’ve never covered more rooftops and fields. Yet cheap electricity that can’t be reliably fed into the grid — or stored and dispatched when demand actually peaks — has a hard ceiling on its value. That tension sat at the center of SNEC 2026, the world’s largest solar trade event, which opened in Shanghai on June 3. LONGi founder Li Zhenguo framed it plainly: the industry’s first chapter is largely written. The next one demands something the sector hasn’t yet delivered at scale.
The problem cheap solar created
Two decades of aggressive cost reduction transformed solar from a premium technology into the cheapest source of new electricity generation in history. But Li Zhenguo argued at SNEC 2026 that it created a new class of problem: abundant, inexpensive electricity the grid cannot always absorb, store, or dispatch when demand requires it.
“Cheap electricity that cannot be stably fed into the grid or flexibly used has a ceiling on its value,” Li said. He framed this not as a technical footnote but as the central hurdle the energy transition must now clear.
Much of the difficulty is structural. When solar arrays and storage systems come from different vendors, they typically rely on incompatible communication protocols. LONGi Vice President Dennis She described what follows: stacked efficiency losses, slow joint debugging, and accountability gaps when something goes wrong. Customers absorb both the direct efficiency cost and the hidden burden of coordinating suppliers who share no common technical language. The industry term for this is the patchwork model.
From component supplier to full-stack integrator
LONGi’s answer is the Full-Stack LONGi ONE strategy, unveiled at SNEC 2026. The move repositions the company from a manufacturer of high-efficiency solar cells and modules into a provider of native, end-to-end solar-storage solutions.
The product matrix covers every major deployment scenario. OneBank 2.0 and OneMatrix 2.0 target GWh-scale power stations, while Hi-MO ONE serves industrial and commercial users. OneNexus addresses off-grid microgrids, OneSync handles power conversion across geographies, and OneOS provides cloud-based intelligent dispatch. Together they form a unified architecture built on what LONGi calls the full 5S stack — BMS, iCCS, EMS, TMS, and PCS — all developed in-house. When every layer shares a common design language, the silo effect between solar generation and storage dissolves at the source.
Li Zhenguo was deliberate about framing the shift. “This is not a cross-border move, but an extension of capability — and also a responsibility,” he said, pointing to 26 years of accumulated expertise in monocrystalline silicon, diamond wire, and BC cell technology as the foundation being extended forward.
Measurable gains over the patchwork model
The efficiency argument for integration is quantifiable. OneBank 2.0 and OneMatrix 2.0 achieve a round-trip efficiency of 93%, roughly four percentage points above comparable discrete systems. Cluster-level management technology increases total power generation over the storage lifecycle by 8%. Those gains together translate into a project ROI improvement of two to four percentage points — meaningful at utility scale.
Safety performance has advanced as well. OneBank extends the thermal runaway prediction window to over three months, the first time that threshold has been reached. On reliability, the single-responsibility model supports a 99% system availability rate, replacing the fragmented accountability of multi-vendor setups where fault attribution can become a prolonged dispute.
BC technology: the efficiency foundation underneath it all
Underlying the entire integrated system is LONGi’s back-contact, or BC, cell technology. Charles Jiang, Vice President of LONGi, described it as the foundational cornerstone of the solar-storage strategy — not a separate product line but the physical basis that makes the system’s performance claims credible.
Traditional solar cells face what Jiang called an “impossible triangle”: open-circuit voltage, short-circuit current, and fill factor constrain each other. BC’s all-back-contact structure eliminates front-side metal shading entirely, resolving the triangle rather than trading off within it. From 6 GW in cumulative global shipments in 2023, LONGi expects BC module shipments to approach 100 GW by end of 2026 — with an estimated 50 GW shipped in 2026 alone.
Recent records support the efficiency claims. LONGi has set world records of 28.13% for single-crystalline silicon cells, 34.1% for commercial-size tandem cells, and 35.2% for crystalline silicon-perovskite tandem cells. BC’s design also reduces hot-spot temperatures by over 28%, cuts microcrack risk by approximately 87%, and delivers 70% less power loss under shading compared to TOPCon.
Global rollout and what comes next
LONGi’s “2830 Plan” sets a concrete target: 30 local service centers in major solar-storage markets worldwide by 2028, covering the full project lifecycle from planning through operations. The first overseas center opened in Madrid, Spain, in May 2026.
Commercial partnerships signed at SNEC signal the ecosystem LONGi is assembling. Agreements with Generali China Insurance, Shenzhen Fengshi Algorithm Technology, and others span storage safety coverage, algorithm optimization, energy operations, and digital networks.
Li Zhenguo closed with a framing that will likely define how the company is measured over the next decade. If the past 20 years were the “first half” of making solar cheap, the next decade is the “second half” of making solar-storage a major dispatchable power source. The industry will be watching whether the numbers, delivered at scale, prove the argument right.
Kelly is an experienced writer with 15 years of experience exploring the big stories that shape our world, from tech breakthroughs and space exploration to climate, energy, and the fascinating quirks of science. She has a talent for turning complex ideas into sharp, memorable insights that stay with readers long after they’ve finished reading.
