Battery storage technology is effectively dismantling the traditional limitations of solar power, allowing electricity generated during peak daylight hours to be utilized after sunset. According to a report by Ember, the rapid expansion of battery capacity is enabling grid operators to shift significant portions of solar generation into evening periods. With global solar output doubling since 2023, this integration is crucial for balancing the grid. As battery costs continue to plummet, the ability to store midday solar energy is becoming a cornerstone of modern power systems, reducing reliance on fossil fuels during high-demand evening hours.
In the first half of 2026, solar energy accounted for over 10 percent of global electricity, a notable increase from 5.6 percent in 2023. While solar generation frequently meets more than 25 percent of demand during midday hours, this contribution historically dropped to near zero overnight. Countries like Chile, the Netherlands, and Germany have seen midday solar supply reach between 55 and 71 percent of their respective electricity demands. However, fossil fuel generation has remained stubbornly high during evening hours, as seen in India and the European Union, where nighttime output has not declined at the same pace as midday production.
The deployment of battery storage is now actively altering this dynamic. Ember projects that 459 GWh of new battery capacity in 2026 could theoretically shift 34 percent of new daily solar generation into later hours. This shift is already visible in markets like California, where solar and battery combinations met over 25 percent of demand during evening peaks in early 2026. Similar trends are emerging in Bulgaria and Chile. This transformation is driven by a 95 percent reduction in battery costs since 2010, with installed prices dropping to $140 per kWh by 2025.
Despite these advancements, experts emphasize that short-duration batteries are primarily a solution for daily balancing. Addressing longer periods of low renewable output will require a diversified energy strategy, including investments in transmission infrastructure, demand flexibility, hydro, nuclear power, and long-duration storage. Ultimately, the continued growth of solar energy will rely on the strategic deployment of batteries and market designs that effectively move inexpensive midday electricity into high-value evening periods, ensuring a more stable and sustainable transition away from fossil fuel dependence.