Introduction
On August 14, 2020, California’s grid operator ordered rotating outages that cut power to roughly 491,000 customers, the first major load-shed event in the state in almost two decades. Two years later, on a hotter day with even higher demand of 51.4 GW, the grid held. The difference was 3.4 GW of new battery storage that had come online in the meantime.
That single comparison captures why solar plus storage has gone from policy talking point to grid backbone in just five years. The U.S. is now adding more battery storage every year than the entire fleet stood at in 2020.
Angelo Zandona, founder of Keystone Fire Consultants and a fire and life safety expert who works with EPCs and developers across the country’s fastest-growing storage markets, watches this transformation from a unique vantage point. The same growth that is solving the grid crisis is also creating a fire-safety challenge that the industry is still working to get ahead of.
Why California Hit a Wall in 2020
California’s grid issue in 2020 was not about renewable energy generating too little. Solar output that summer hit peaks as expected. The problem came after sunset. Air conditioning loads stayed high. Imports from neighboring states were not available because the same heat wave covered the whole region. Natural gas units had been retired, derated, or were simply not enough.
CAISO had to shed about 1 GW of load to keep the system stable. At the time, only about 200 MW of grid-scale storage was operating in California, far short of what would be needed to bridge the evening ramp.
How Storage Filled the Gap
The state moved quickly. By the end of 2023, California had more than 7 GW of utility-scale battery storage. By 2024 the figure had grown again, helped by mega-projects such as Moss Landing. When the 2022 heat wave hit, demand climbed higher than 2020. But storage absorbed daytime solar and discharged into the evening peak. The blackouts did not return.
Texas followed a similar path, though for different reasons. ERCOT’s summer peaks and winter cold snaps stressed the grid in 2021 and 2022. Batteries deployed across the state began to mitigate emergencies in subsequent summers. By 2025, batteries were credited with helping ERCOT avoid emergency conditions during multiple high-load events.
Where the Growth Is Happening
The geography of storage growth is tightly concentrated. Texas is expected to add about 12.9 GW of battery storage in 2026, California 3.4 GW, and Arizona 3.2 GW. Together these three states account for roughly 80% of new U.S. capacity for the year. Nevada and New Mexico round out the top five.
Nevada alone deployed about 1.4 GW of new storage in 2025, including completion of the Primergy Gemini Solar + Storage project. The EIA expects 12 states to exceed 1 GW of installed storage by 2030, up from just five today.
The common thread across these regions is grid stress. They all have large solar fleets, hot summers, growing demand, and limited transmission flexibility. Storage is the tool that lets the grid translate midday solar abundance into evening reliability.
What the Fire Safety Picture Looks Like
Rapid deployment has not been without incident. The May 2024 Gateway fire in San Diego saw flare-ups for seven days. The January 2025 Moss Landing fire forced the evacuation of about 1,200 residents for 24 hours. These incidents drew significant media coverage and have made AHJs in California, Texas, and other growth markets more cautious about permitting. The underlying data, however, shows substantial progress. EPRI, TWAICE, and Pacific Northwest National Laboratory found that failure rates per gigawatt deployed dropped about 97% between 2018 and 2023. The industry is getting safer even as it gets larger.
For Angelo Zandona and the team at Keystone Fire Consultants, the story behind that improvement is mostly invisible. It lives in better Hazard Mitigation Analyses, more rigorous UL 9540A test integration, sharper Emergency Response Plans, and earlier engagement with fire marshals. The headlines remember the fires. The trend line reflects the quiet work that has prevented many more.
The Policy Question
For policymakers and utilities, the next decade of grid planning has to answer two questions at once. How much solar plus storage capacity does the system need, and how does fire safety scale with it?
The first question is being answered by markets. The U.S. energy storage industry has signaled roughly $100 billion in planned investment in domestic manufacturing over the next five years. Together, solar and storage made up 81% of expected 2025 capacity additions and a similar share of 2026 additions.
The second question, fire safety at scale, is being answered through codes and consultants. NFPA 855 and UL 9540A are the technical backbone. Fire and life safety experts like Angelo Zandona through firms such as Keystone Fire Consultants work in the gap between those documents and the realities of specific sites, climates, and AHJs.
Conclusion
The U.S. grid is being rebuilt in real time, and battery storage is doing much of the heavy lifting. California, Texas, Arizona, Nevada, and New Mexico are leading the deployment curve, with other states close behind.
Rolling blackouts that once seemed inevitable during heat waves have become avoidable in many cases. The grid is absorbing more renewable generation than it could a few years ago. Demand spikes that would have triggered emergencies now meet a fleet of batteries ready to discharge.
Each new site is a fire safety case that must be made carefully, documented thoroughly, and reviewed by an AHJ. The work of Angelo Zandona and the team at Keystone Fire Consultants is part of how the industry meets its growth targets without compromising community safety. The grid crisis is not yet solved. But the tools are now in place to address it, and the safety infrastructure to deploy them responsibly is catching up.
FAQs
How did batteries help California avoid blackouts after 2020?
ANS: By 2022, California had several gigawatts of new storage online. These batteries absorbed daytime solar output and discharged into the evening peak, bridging the gap that had triggered the 2020 outages.
Which states lead U.S. battery storage growth?
ANS: Texas, California, and Arizona account for roughly 80% of new utility-scale storage capacity planned for 2026, with Nevada and New Mexico also showing significant deployment.
Are BESS fires common?
ANS: Failures are rare relative to deployment. EPRI’s database tracks roughly 90 publicly reported grid-scale incidents since the first utility-scale system was installed in 2012, and failure rates per gigawatt have dropped significantly since 2018.
How do storage fires affect communities?
ANS: Fires can produce toxic off-gas, require evacuations, and lead to extended cleanup operations. Recent incidents at the Gateway and Moss Landing facilities in California are examples of why AHJs and communities take siting seriously.
What role does fire safety consulting play in BESS deployment?
ANS: Consultants prepare the Hazard Mitigation Analyses, Emergency Response Plans, Water Supply Analyses, and deflagration analyses required by NFPA 855 and AHJs. Strong documentation accelerates permitting and reduces project risk.
