Cheap Batteries Now Make 24/7 Solar Power Viable
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Rapid advances in battery technology and plummeting costs have made round-the-clock solar power viable in the world’s sunniest regions, according to a new report.
Critics of wind and solar have long cited their intermittency as a reason to keep burning fossil fuels - an argument that, happily, is becoming increasingly irrelevant as batteries improve and costs plummet. According to Ember's April 2026 analysis, which looked specifically at India, combining solar power with battery energy storage systems (BESS) can meet up to 90 percent of the country's electricity demand at a competitive cost. This approach makes solar a reliable, nearly 24/7 power source, offering a cost-effective alternative to traditional fossil-based grids
“The dramatic improvement in battery economics over the past two years has delivered the missing piece that turns sunshine into reliable electricity day and night,” said Kostantsa Rangelova, Ember’s global electricity analyst.
This report builds on Ember’s previous analysis showing that rapid advances in battery technologies have made round-the-clock solar electricity increasingly viable in the world’s sunniest regions.
The economics are already very attractive. Solar has become “the cheapest form of electricity in history“, according to the International Energy Agency, since 2020. More recently, battery economics have improved dramatically in just the last two years. Following a sharp 40 percent fall in turnkey battery costs in 2024, 2025 saw another big fall of 31 percent. Previous Ember analysis has shown that falling battery costs and improving storage technologies are making round-the-clock solar electricity increasingly viable, enabling it to meet 90 percent of electricity demand efficiently in solar-rich countries like Mexico, and helping them become global solar superpowers. India is also one of these solar-rich countries.
As OGN reported late last year in Globally, Mega-Batteries Are Now Unlocking Mega-Energy, the pace of installation is accelerating around the world. That's good news because they are the key to unlocking the clean energy revolution. Indeed, a massive project in Abu Dhabi that aims to prove that 24/7 solar power is possible is due to become operational next year. By combining the solar array with an enormous amount of battery capacity, the facility is expected to be able to store enough power generated during daylight hours so that between 750,000 homes can be powered 24 hours a day, 365 days a year. As they say, what is the point of pouring billions of dollars into solar farms, critics have often asked, when they are unable to deliver power when the sun is not shining?
New Innovation Stores Summer Solar Power For Use in Winter: It aims to tackle long-duration storage across seasons, one of the greatest challenges facing renewable energy systems.
