The global power mix has arrived at a historic inflection point. Analysis from Rystad Energy indicates that the peak in fossil fuel consumption for power generation is imminent, signaling a fundamental and irreversible structural shift in the energy industry. As global electricity demand continues its unabated climb, the remarkable growth rate of low-carbon energy sources is now nearly sufficient to cover this entire increase, heralding a new era powered by renewables and their enabling technologies. At the heart of this transformation lies the symbiotic relationship between solar photovoltaics (PV) and battery energy storage systems (BESS), a combination poised to become the most cost competitive and scalable source of new power generation worldwide. The long-term forecast for the global power mix is a testament to the ascendancy of solar power. According to Rystad Energy’s base case forecast, solar PV is projected to add more new generation capacity than all other energy sources combined between 2024 and 2050, expanding its output tenfold over this period. This meteoric rise, alongside the significant growth of wind power, introduces a critical challenge: intermittency. The sun does not always shine, and the wind does not always blow, creating a pressing need for technologies that can ensure grid stability, reliability, and flexibility.

/By absorbing excess energy during periods of high generation and discharging it during times of peak demand or low renewable output, batteries smooth out the volatility inherent in sources like solar and wind.

This is where energy storage, particularly BESS, becomes an indispensable partner. As the share of variable renewables grows, the grid’s ability to balance supply and demand in real-time is strained. BESS provides the critical flexibility required for the secure operation of modern power systems. By absorbing excess energy during periods of high generation and discharging it during times of peak demand or low renewable output, batteries smooth out the volatility inherent in sources like solar and wind. 

The economic case for this partnership is strengthening rapidly. Continuous improvements in the efficiency and energy density of battery systems, coupled with declining costs for components like battery cells and power electronics, are driving down the overall turnkey cost of BESS projects. This declining cost curve positions the solar-plus-storage model as a highly competitive solution for new greenfield power assets in most global markets, capable of providing reliable, dispatchable, and clean energy.

Regional Dynamics in Energy Transition
While the global trend towards decarbonization is clear, the trajectory of the energy transition varies significantly by region, reflecting diverse economic conditions, policy landscapes, and resource availability. 

China stands out as the world’s absolute leader in power generation growth over the past decade. The nation has simultaneously led in renewable energy deployment, yet fossil fuels continue to constitute the majority of its power production. The critical forecast for China is not an immediate decline in fossil fuel generation, but rather a plateau. As the country’s formidable power demand continues to spike, this new demand is expected to be met almost entirely by the rapid expansion of renewable capacity, allowing fossil fuel output to level off before eventually declining. The rest of the Asia-Pacific region presents a different picture, where fossil fuel generation is not expected to peak until 2031. Comprising a diverse set of nations, a common threat is a rapidly growing power sector where renewable deployment has been slower, or potential is more limited. Consequently, fossil fuels will play a significant role in meeting rising energy needs for the remainder of the decade. 

In the developed economies of North America and Europe, trajectories also diverge. Both regions have experienced relatively weak power demand growth over the last decade but are now seeing a resurgence. The key distinction lies in their fuel mix. North America maintains a substantially higher share of fossil fuels, dominated by natural gas, whose demand is expected to continue rising in the coming years. In contrast, Europe’s reliance on fossil fuels in the power sector peaked over a decade ago, in 2007-2008, and the continent is on a more established path toward renewable integration. 

Looking towards mid-century, the global generation forecast reveals a profound reshaping of the energy landscape. While solar and wind will overwhelmingly dominate growth, other conventional sources are being repositioned. Coal power, currently the world’s largest source of electricity, is set for a significant and structural decline. Driven by national phase-out policies, cost non-competitiveness against renewables, and large-scale coal-to-gas switching programs, its role will diminish considerably over the next 25 years.

In 2025, the share of installed BESS capacity passed 50% of total operational energy storage systems globally, making a remarkable year for batteries

The future of natural gas is more nuanced. Its primary role is evolving from baseload generation to a provider of flexibility, filling the gaps left by intermittent renewables. However, as BESS costs continue to fall, gas peaker plants face increasing competition for this crucial grid balancing role. The declining utilization rates of these gas plants will narrow the cost gap, further favoring battery storage solutions. Finally, hydropower is expected to see limited growth, as most of the economically viable potential in developed regions has already been exploited, with future expansion concentrated primarily in Asia and Africa.

The Exponential Growth of Global Energy Storage
The deployment of energy storage is no longer a niche market; it is a global November 2025 In 2025, the share of installed BESS capacity passed 50% of total operational energy storage systems globally, making a remarkable year for batteries. 17 phenomenon undergoing exponential growth. From a base of just under 0.5 terawatts (TW) in 2024, total installed energy storage capacity is expected to surge more than ninefold to reach 4 TW by 2040. This explosive expansion, averaging an annual growth rate of nearly 24%, makes energy storage one of the fastest growing infrastructure segments in the world. 

Battery energy storage systems (BESS), among other technologies such as compressed air energy storage (CEAS), thermal energy storage (TES), and gravity energy storage, have been driving the big growth in energy storage markets. In 2025, the share of installed BESS capacity passed 50% of total operational energy storage systems globally, making a remarkable year for batteries. 

In 2024 alone, a groundbreaking 180 gigawatt-hours (GWh) of new BESS projects came online, representing a year-on-year growth rate of 80% and bringing total global operational battery storage to 350 GWh. Mainland China has firmly established itself as the dominant force in this expansion, accounting for over half of new additions with more than 100 GWh of new capacity in the last year. The United States followed with a significant 35 GWh of new installations, while Germany, Australia, and the United Kingdom rounded out the top five, underscoring the global nature of this trend. 

Looking ahead, China is projected to add over 1.9 TW of storage capacity by 2040, representing half of all global additions, with the US, India, Germany, and Australia also demonstrating strong growth momentum fueled by policy support and expanding use cases. This global demand is driven by the critical role of BESS in modernizing power grids, where their rapid response times are essential for services like market balancing in addition to providing generation f lexibility. This makes them a crucial solution, as traditional grid infrastructure takes much longer to adapt to the power system’s rapid expansion.

Technology, Supply Chain, and Economics 

The Battery Energy Storage System (BESS) market is overwhelmingly dominated by lithium-ion (Li-ion) technology, which accounts for over 97% of utility-scale projects worldwide. On the supply side, vast majority of global battery cell production is also based on Li ion chemistries. Within the Li-ion family, technologies are primarily differentiated by their cathode material, with nickel-based (e.g., NMC) and iron-based (LFP) cells being the two principal types produced globally. 

Total battery cell production is projected to pass 2,000 GWh in 2025, a capacity more than sufficient to meet the combined demands of the electric vehicle (EV) and energy storage (ESS) markets. However, this manufacturing capacity is heavily concentrated in China with close to 80% of the global production. Among the chemistries, NMC and LFP cells constitute the majority of production, although emerging technologies like sodium-ion and semi-solid-state batteries are gaining traction. 

For energy storage applications, Lithium Iron Phosphate (LFP) cells have become the mainstream technology. While LFP has a lower energy density compared to nickel-based Lithium-ion cells, energy density is less of a constraint for stationary BESS designs where space limitations are not critical. LFP’s advantages of lower cost, longer cyclability, and superior safety regarding thermal runaway have enabled it to outpace nickel-based batteries for grid-scale production and deployment.

The global energy transition is no longer a distant prospect; it is a present-day reality being written by the powerful synergy of solar power and battery storage.

This reliance on LFP creates a significant supply chain dependency. Both Europe and the US face a structural shortage of localized LFP production, making them heavily reliant on Chinese suppliers. The surging demand for cost-effective BESS has far outpaced regional manufacturing capacity in world expect China. While non-lithium-ion technologies like flow batteries are operational, their supply chain and production scale is insufficient to meet the annual BESS demand, which is in the hundreds of gigawatt-hours.

Nevertheless, for non-lithium-ion BESS, China is also the frontrunner in deploying these alternative battery technologies and is the biggest market for it. 

The ultimate catalyst for BESS adoption—and a major barrier for competing technologies—is the declining cost of Li-ion systems. This reduction is driven by techno logical advances where enables more energy dense containers and manufacturing economies of scale, causing the Levelized Cost of Storage (LCOS) for a BESS project to fall dramatically. This powerful downward cost trajectory for lithium-ion storage systems makes it increasingly challenging for alternative techno-logies to displace it, despite regional supply chain concerns. This trend, however, exhibits significant regional variation. 

Chinese BESS projects have achieved record-low turnkey costs, approaching USD 150 per kilowatt− hours ($/kWh). This is attributed to superior system energy density, highly efficient supply chains, and lower engineering, procurement, and construction (EPC) costs. In the Middle East, costs are also highly competitive, often below $200/kWh, thanks to the dominance of Chinese suppliers and lower labor costs. 

In the United States, the situation is more complex. The 2022 Inflation Reduction Act (IRA) provided substantial investment tax credits to support domestic energy storage projects. However, these incentives are partially offset by stringent domestic content requirements, and recent tariffs on imported components, and significantly higher labor costs. Consequently, the final turnkey price and overall LCOS in the US remain elevated compared to other major markets. 

The global energy transition is no longer a distant prospect; it is a present-day reality being written by the powerful synergy of solar power and battery storage. The imminent peak of fossil fuels in the power sector is clearing the way for a system defined not by centralized, inflexible thermal generation, but by distributed, intermittent renewables managed with sophisticated, f lexible storage. The economic and technological momentum behind BESS is transforming it from a complementary grid asset into a foundational component of the energy system. While challenges related to supply chains, policy implementation, and grid modernization remain, the trajectory is clear. The solar-plus-storage model is rapidly evolving from a competitive alternative to the new cornerstone of a reliable, affordable, and sustainable global power economy.