How Can The Solar-plus-storage Sector Surmount The Three Great Mountains?

 

The fundamental contradiction in renewable energy power plant investment has shifted from a singular focus on cost reduction to a dual challenge: reducing costs while simultaneously ensuring grid stability. Consequently, the core difficulty facing solar-plus-storage projects has moved beyond mere equipment pricing to center on overall system capabilities.

 

When examining the industry's fundamental nature and breaking down system capabilities into finer detail, what are the true pain points that solar-plus-storage must overcome?

 

Low cost, high efficiency, and robust stability constitute an "impossible triangle"-an unavoidable trade-off as renewable energy transitions into a primary power source. Driving costs too low tends to compromise system redundancy and long-term reliability. Boosting efficiency relies on complex energy routing, storage management, and coordinated control, which inevitably raises costs and lowers reliability. Meanwhile, higher stability requirements-necessitating grid-forming capabilities, long-duration energy storage, grid-compliance testing, and advanced O&M systems-significantly increase investment intensity. Thus, while solar-plus-storage project tenders may appear to be a battle over price quotes, the deeper competition actually plays out within the system architecture itself.

 

 

 

 

01 The First Major Hurdle: Cost

 

Solar modules have become so inexpensive that the entire industry is selling them at a loss, and energy storage systems have returned to a balanced supply-demand state as shortages of upstream materials and battery cells have eased. What the solar-plus-storage industry truly lacks now are system solutions capable of delivering investment returns despite these low price points.

 

Over the past two years, prices across the solar and energy storage supply chains have steadily declined; while project owners have indeed reduced hardware investment costs, project yields have not improved. The reason is simple: equipment costs represent only a portion of the total investment. Factors such as step-up substations, grid-connection lines, energy storage capacity configuration, grid-compliance testing, O&M complexity, line losses, conversion losses, and downtime risks all impact project profitability.

 

Therefore, no matter how cheap solar and storage products become, if the system architecture remains complex, engineering requirements cannot be reduced, energy conversion paths are not shortened, and storage utilization rates do not improve, the consequences will ultimately be reflected in the plant's CAPEX, LCOE, and IRR.

 

This represents the first major hurdle for solar-plus-storage plants. Intense price competition in the sector addresses hard procurement costs but fails to resolve overall system costs.

 

One undeniable fact is that the greater the energy storage capacity and the longer the discharge duration, the better the economic returns.

 

There are two key takeaways from this data:

 

First, cost savings do not stem from the individual equipment units themselves; rather, they arise from the consolidation, simplification, and reuse of various system components. In traditional PV-plus-storage setups, functions such as PV inversion, energy storage power conversion, voltage step-up, grid connection, and control are often handled by separate, distributed units.

 

Second, as the scale of PV-plus-storage plants increases-along with higher storage-to-generation ratios and stricter requirements for continuous power supply-the inefficiencies inherent in traditional systems (such as redundant equipment, repetitive power conversion, and engineering complexity) become more pronounced. If a matrix-style architecture can be successfully deployed in scenarios like large-scale energy bases, direct green power connections, AIDC facilities, and mining microgrids, its economic value will far exceed the benefits of simply swapping out an inverter.

 

Competition in the PV-plus-storage industry has currently entered a low-margin phase. Domestic quotes for energy storage systems continue to drop, and tender prices from central and state-owned enterprises are repeatedly hitting new lows; meanwhile, battery cell manufacturers, PCS providers, system integrators, and EPC contractors are all vying for influence over the system. While relying solely on low prices to win orders makes it easy to inflate top-line revenue, it is difficult to maintain healthy profit margins and cash flow simultaneously.

 

 

02 The Second Major Challenge: Efficiency

 

In the photovoltaic (PV) industry, efficiency is a key focus; historically, the most commonly monitored metrics were module conversion efficiency and inverter conversion efficiency. However, as the industry enters the era of PV-plus-storage integration, the concept of efficiency has become more complex.

 

Ultimately, the true measure of a PV-plus-storage power plant is the amount of usable electricity it delivers. Can the PV system maximize generation despite varying orientations, shading, degradation, temperature fluctuations, and complex terrain? Can the energy storage system discharge more usable energy over its entire lifecycle? Can the electricity generated by the PV system reach storage units, loads, and the grid with fewer conversion stages? All these factors determine the project's profitability.

 

 

03 The Third Major Challenge: Stability

 

If one looks solely at the cost of solar power generation, new energy is already sufficiently competitive. However, the situation becomes complex when the stability of the power system is factored in-this is precisely the pain point plaguing the new energy sector.

 

With the integration of new energy at high penetration levels, the power grid faces challenges that go beyond mere fluctuations in power output; it must also contend with a host of system-level issues involving voltage, frequency, inertia, short-circuit capacity, weak-grid adaptability, fault ride-through, and black-start capabilities. Historically, these functions were primarily handled by traditional power sources-such as thermal, hydroelectric, and pumped-storage plants-and grid-side resources. Yet, as the share of installed new energy capacity continues to rise, solar-plus-storage power plants themselves must take on a greater role in supporting power system functions.

 

This represents the third-and most formidable-major challenge facing solar-plus-storage plants; it is the highest peak to scale.

 

In the past, stability was largely viewed as a technical requirement for grid connection-a threshold for project compliance. Moving forward, however, stability may determine whether a project can participate in higher-value applications. Loads such as data centers, industrial parks, mines, islands, and facilities producing green hydrogen, green ammonia, and green methanol demand continuous power supply, local autonomy, fault isolation, and black-start capabilities.

 

The solar-plus-storage industry has moved past the phase where "low cost is king." Consequently, the valuation methods for new energy assets are set to change. A project's quality is no longer judged merely by equipment procurement costs; factors such as system efficiency, grid-connection capabilities, operational stability, dispatchability, and revenue sustainability are now critical.

 

This signifies a shift in industry competition from price wars on the manufacturing side to battles over system-level capabilities.

 

As solar power establishes itself as a primary energy source, the industry must navigate stricter power system constraints and enter a more complex phase of revenue realization. The "three mountains" of cost, efficiency, and stability-which long weighed heavily on solar-plus-storage plants-are now becoming key levers for leading enterprises to redefine their competitive strengths and market positioning.