The photovoltaic industry is shifting from an “installation race” to a “reliability race.”

The Photovoltaic Industry Is Shifting from an “Installation Race” to a “Reliability Race”

As U.S. and global renewable energy installations continue to expand, the photovoltaic industry is entering a stage that places greater emphasis on long-term performance, risk control, and asset bankability. The 2026 PV Module Index report released by RETC shows that developers, lenders, and owners are increasingly focusing on how modules perform in real-world environments, rather than just factory certification or nameplate efficiency. The report points out that, driven by AI data centers, industrial electrification, and overall electricity demand growth, new U.S. utility-scale solar installations in 2026 are expected to exceed 43 GW. For an industry already regarded as critical infrastructure, reliability is no longer an optional extra, but a core variable in project returns and system stability.

Industry Background

The global energy system is undergoing a dual restructuring: on one hand, the share of renewable energy in new power installations continues to rise; on the other hand, the carrying capacity of the grid, energy storage, and supply chains is becoming a key constraint on clean energy expansion. The International Energy Agency (IEA) and other organizations have long pointed out that solar has become one of the clean energy technologies with the greatest potential for scaling, but its large-scale penetration also amplifies the requirements for equipment quality, lifecycle performance, and system integration capabilities.

This RETC report reflects a more mature market signal: amid intense price competition in photovoltaic modules, rapid global manufacturing expansion, fluctuating material costs, and ongoing supply chain restructuring, the single “lowest price first” procurement logic is giving way to a comprehensive evaluation framework of “bankability + reliability.” For large power plants and long-term hold assets, module performance degradation, early failures, and quality consistency issues will directly affect power generation, O&M costs, insurance terms, and project valuations.

From a policy perspective, as the energy transition enters a phase of high-density construction, countries are placing increasing attention on power security, supply chain resilience, and domestic manufacturing. This means the solar industry must not only prove its low-carbon credentials, but also demonstrate the stability and auditability of its role as power infrastructure.

Current Developments

RETC’s 2026 PV Module Index uses extended stress testing to identify potential risks beyond standard certification tests. The report notes that the testing was completed between the second quarter of 2025 and the first quarter of 2026, with a focus on module performance under operating conditions closer to real-world scenarios.

• Several noteworthy signals include:- More than 10% of samples showed “red flag” results in the 2,000-hour damp heat test;
• About 8.3% of samples showed unacceptable UV-induced degradation in the second year in succession;
• In test categories such as damp heat, PID (potential-induced degradation), static and dynamic mechanical loading, and thermal cycling, red flag results increased year over year;
• The failure modes observed in these laboratory tests echo the negative performance trends that technical due diligence firms have seen in field projects in recent years.

The report also listed several manufacturers that received high ratings across different test categories. According to public information, manufacturers that have continuously held Overall Highest Achiever status for more than three years include JA Solar, Jinko Solar, LONGi Solar, Runergy, Solarspace, Trina Solar, VSUN Solar, Waaree, and Yingli Solar. At the same time, RETC also emphasized that such ratings do not mean any one brand is “absolutely superior,” but rather reflect its performance under a specific testing framework.

More importantly, RETC described the industry as shifting from a “deployment story” to a “performance and risk management story.” This sentence points to a key change: as solar PV moves from a marginal technology to a main source of power, the long-term stability of modules is no longer just an R&D issue, but a capital allocation issue.

Impact on the Energy System

The significance of improved solar reliability goes far beyond equipment selection for a single project.

First, it affects the predictability of power supply. For large-scale solar plants, deviations in power output, rising degradation rates, and localized failures can weaken the credibility of capacity planning, thereby increasing the need for backup power and energy storage. As the share of variable renewable energy in the power system rises, system dispatch increasingly depends on accurate asset performance data.

Second, it affects energy security and grid stability. If modules develop consistency issues during long-term operation, plant availability, maintenance frequency, and outage windows will all increase. This not only raises operational risk, but also shifts more pressure onto already strained transmission networks and supporting energy storage systems.

Third, it affects electricity costs and the cost of capital. Developers, banks, insurers, and independent engineers are increasingly relying on third-party testing, supply chain traceability, and BOM (bill-of-materials) verification to assess whether a project is long-term financeable. In other words, module quality is not just a technical metric; it is also becoming part of financing pricing.

Fourth, it affects supply chain allocation. As global manufacturing capacity expands rapidly, the market’s requirements for consistency, traceability, and repeatability will rise. This will drive stricter quality management, more third-party verification, and higher procurement standards.## Challenges Ahead

Despite strong momentum in solar expansion, the industry still faces a series of structural challenges.

1. Insufficient energy storage and grid absorption capacity

The intermittency of solar power means that growth in installed capacity does not automatically translate into growth in system-available electricity. If grid expansion and energy storage deployment fail to keep pace, new solar projects will face curtailment, wasted generation, and weaker electricity prices during low-demand periods.

2. Transmission network constraints

In many regions, the pace of grid modernization still lags behind the pace of new energy construction. Interconnection queues, insufficient substation capacity, and cross-regional transmission bottlenecks all widen the gap between what can be built and what can actually be connected to the grid.

3. Project financing pressure

As the market places greater emphasis on long-term risk management, developers need to pay for higher standards of testing, certification, and due diligence. For small and medium-sized enterprises or new entrants, this may raise the upfront development threshold.

4. Policy uncertainty

Changes in domestic manufacturing, tariffs, subsidies, and interconnection rules across countries will alter project procurement and delivery schedules. The stronger the policy support, the faster the market expands; but the more frequently policies shift, the greater the uncertainty in supply chains and capital allocation.

5. Raw material and manufacturing consistency issues

Rapid capacity expansion does not always automatically lead to quality improvement. Changes in material selection, production-line ramp-up, and global supply chain restructuring can all introduce new failure modes. This is precisely the point RETC emphasizes: standard certification does not equal full-life-cycle reliability.

6. The gap between technology maturity and field performance

There is always a gap between laboratory testing, certification testing, and real-world operating conditions. What the industry truly cares about is whether modules can maintain expected performance under high temperatures, high humidity, UV exposure, mechanical load, and long-term thermal cycling. This is also why third-party reliability testing is becoming increasingly important.

Future Outlook

Over the next 5 to 20 years, competition in the solar industry is likely to continue shifting from “who can expand capacity the fastest” to “who can reliably deliver higher-quality long-term power-generating assets.”

From an energy mix perspective, solar power will remain an important pillar of global clean energy expansion, but its role will gradually shift from simply adding new generation to becoming infrastructure assets driven by system value. Alongside this, the importance of energy storage, smart grids, transmission upgrades, and demand-side response will continue to rise.

From an investment perspective, capital will increasingly favor projects and supply chains that can reduce full-life-cycle risk. For developers and asset managers, third-party testing, supply chain transparency, and long-term performance data will increasingly become “must-haves” rather than “nice-to-haves.” This means manufacturers, testing organizations, and engineering service providers with strong reliability capabilities will be better positioned in competition.From a technical perspective, the industry will not slow solar expansion because of reliability issues; instead, it will drive stricter material verification, accelerated aging tests, and more refined quality control systems. As project scales grow and holding periods lengthen, the market will place greater value on “predictable returns” rather than “theoretical efficiency.”

From the perspective of the global competitive landscape, photovoltaic manufacturing will continue to be one of the key industries in the energy transition. Whoever can find the right balance among large-scale production, quality consistency, supply chain traceability, and international certification systems will be more likely to earn long-term market trust.

Overall, what this RETC PV Module Index reveals is not just module test results, but that the entire solar industry is entering a more mature stage: clean energy expansion is still continuing, but capital, policy, and engineering logic are all demanding higher verifiability. Future competition will no longer be merely a contest of installed capacity, but a contest of reliability, resilience, and long-term asset management capabilities.