The energy storage sector remains a developing market compared to more mature renewables like solar and wind. As it expands globally, its dynamics are in constant flux. Our StorageTech Bankability Rating Report aims to reflect these shifts, including evolving methodology to stay current.
A key trend is the rising market share of system integrators, making the discussion of vertical integration increasingly relevant.
Integrators vs. Cell Manufacturers: A Diverging Path
Analysis of the top 10 players in each category reveals a growing disparity in average shipment volumes, projected to triple this year. While integrators claimed three of the top five spots by shipments last year, this appears driven by standout individual companies rather than the group as a whole outperforming cell manufacturers, who generally maintain higher volume shipments.
The shipment spread among integrators shows greater variability than cell manufacturers. For both, however, the gap between market leaders and others is widening as the top players consolidate their positions. The market remains relatively concentrated, with the top 10 suppliers estimated to account for over half of all shipments this year.
Higher Growth Trajectory for Integrators
Integrators are forecast to achieve higher year-on-year shipment growth. Their typically more flexible models, sourcing cells from multiple suppliers, allow them to scale rapidly without being constrained by in-house production limits. New market entrants are also more likely to be integrators due to the significant capital expenditure required for cell manufacturing.
Cell manufacturers, many of whom also supply the competitive electric vehicle market, invested heavily in recent years to build capacity. For instance, CALB's capital expenditure surpassed its revenue between 2020 and 2023. However, amid battery oversupply and falling prices, many are now pulling back on major investments, a trend more acutely felt by smaller players.
Financial Pressures and Margins
Despite rising shipment volumes, revenue growth for cell manufacturers has been dampened by declining cell prices, a trend accelerated by falling lithium prices since 2022. This price drop, however, can benefit integrators' cost structures. While cell manufacturers' operating margins have been mixed this year, potential for full-year growth exists through increased overseas revenue and cost-cutting efforts.
Integrators often benefit from more diversified revenue streams, with ESS constituting a smaller portion of sales, potentially buffering them against market downturns. Nevertheless, ESS is becoming a more significant revenue segment for both groups.
Methodological Evolution in Assessment
Our bankability assessment considers both financial health and manufacturing capabilities, evaluating a company's overall longevity and the stability of its ESS business unit. While the financial analysis uses the Altman-Z score, the manufacturing score combines cell production, assembly, and final product shipments.
Currently, integrators and cell manufacturers are evaluated together, and some integrators have demonstrated strong competitiveness against vertically integrated suppliers. Consequently, while cell manufacturers retain a strong market position with greater supply chain and quality control, we have reduced the weighting of in-house cell production within the overall manufacturing score in the latest report—an adjustment that reflects current market conditions.
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