How Falling Battery Costs Are Turning Solar Power Into a 24-Hour Energy Source

2026-08-12 economy

London, Wednesday, 12 August 2026.
Solar generated a record 10% of global electricity in early 2026. A 95% drop in battery costs is now enabling grids to supply solar power even after dark.

Record Solar Generation and Battery Economics

Global solar electricity generation reached a historic milestone in the first half of 2026, accounting for 10% of total global electricity production [1]. This represents a significant increase from 8.9% in the first half of 2025 and 5.6% in the first half of 2023 [1]. Over this three-year period, global solar generation doubled from 769 TWh in the first half of 2023 to 1,564 TWh in the first half of 2026, representing a growth rate of 103.381 percent [1]. This surge is underpinned by a dramatic reduction in energy storage costs, with global average installed battery costs falling 94.685 percent between 2010 and 2025 [1]. The cost per kilowatt-hour dropped from $2,634 in 2010 to $140 in 2025, driven largely by the emergence of lithium iron phosphate (LFP) technology [1]. This economic shift is enabling the transition from intermittent solar power to a more reliable, anytime energy source [1].

Intermittency Challenges and Regional Disparities

Despite the generation records, solar power remains highly concentrated during daytime hours, creating distinct grid management challenges [1]. In the first half of 2026, solar met over 25% of global electricity demand between 11:00 and 14:00, but contribution dropped to near zero between 20:00 and 05:00 [1]. In mature markets, this disparity is even more pronounced; Chile reached 71% of demand at noon, while the Netherlands hit 58% at 13:00, yet all markets fell to near zero by 21:00 [1]. This intermittency necessitates continued reliance on fossil fuels during evening peaks [2]. In India, fossil generation between 17:00 and 07:00 averaged 168 GW in the first half of 2026, an increase of 22 GW from the same period in 2023 [2]. Similarly, EU fossil generation at the evening peak declined only slightly from 106 GW to 101 GW between the first half of 2023 and the first half of 2026 [1]. California has begun addressing this timing mismatch by deploying large-scale battery systems to capture excess solar energy during the day and deliver it back to the grid when demand peaks at night [4].

Investment Trends and Infrastructure Development

Financial markets are responding to the need for hybrid renewable assets, with significant capital flowing into solar-plus-storage projects [3]. On 10 August 2026, European Energy secured £58.1 million in construction financing from Danske Bank for the Indian Queens renewable energy project in Cornwall, UK [3]. The project combines 68MW of solar PV capacity with a 47.5MW/95MWh battery energy storage system, with construction having begun in May 2026 [3]. Commercial operations at the site are expected to commence in 2027, marking it as a future asset in the grid stability landscape [3]. Meanwhile, in China, grid-scale battery installations are surging as a highlight of the recent Five-Year Plan, though market incentives for efficient utilization remain a focus area for improvement [5]. Analysts note that while China is a leader in this field, electricity markets can do more to incentivize the efficient utilization of various grid assets, including battery storage [5].

Future Outlook and Grid Integration

Looking ahead, battery deployment is projected to significantly alter how solar energy is utilized throughout the day [2]. Global battery deployment in 2026 is expected to theoretically shift 34% of new daily solar generation into evening hours, up from 4% in 2021 [2]. By 2030, smart electric vehicle charging could absorb approximately 8% of peak hourly wind and utility solar generation in the Netherlands [1]. Realizing the full benefits of expanded battery storage requires accelerated deployment and electricity market reforms to allow storage participation in energy and ancillary service markets [2]. As battery storage becomes economical for daily cycling, decreasing costs are increasing the viability of longer-duration storage to address seasonal gaps [1]. This evolution is critical for reducing reliance on evening coal generation and optimizing existing solar asset utilization [2].

Sources

Solar Energy Battery Storage