China has deployed a pioneering 1.25 MW vanadium flow battery (VFB) energy storage system designed specifically for underground commercial spaces, marking a major step forward in safe energy storage deployment within dense urban environments. The project was developed through a collaboration between Sichuan Tianfu Energy Storage Technology and Sichuan Chemical Group.
The initiative is considered China’s first demonstration of vanadium flow battery deployment within the underground space of a commercial building, addressing the growing demand for secure and reliable energy storage in cities where space limitations and strict safety regulations increasingly restrict conventional battery technologies.
Rising Safety Regulations in Energy Storage
The project comes at a time when rules about how to safely use electrochemical energy storage systems are getting stricter. Authorities in Hunan Province made rules in February 2026 that stopped lithium-ion and sodium-ion battery systems from being put in underground, semi-underground, rooftop, or densely populated building areas because of the risk of thermal runaway.
Vanadium flow batteries are exempt from these restrictions because they utilize non-flammable, water-based electrolytes, making them significantly safer for installations in sensitive locations such as underground facilities and commercial buildings.
Designed for Urban Underground Deployment
The 1.25 MW system was made specifically for use in the basement of a commercial office building, where safety, reliability, and compatibility with the building’s infrastructure are very important.
Key safety features include:
- Non-flammable electrolyte: Water-based vanadium electrolyte eliminates fire or explosion risks
- Decoupled power and energy architecture: Separate electrolyte tanks and battery stacks prevent chain reactions even if leakage occurs
- Underground compatibility: No high-temperature hazards or toxic gas emissions, enabling compliance with building fire safety standards
These characteristics position vanadium flow batteries as an ideal solution for energy storage in urban underground environments where conventional battery systems face installation limitations.
Supporting Building Energy Demand
The system can handle a 1.1 MW air-conditioning load for the office building, which helps keep the electricity supply stable during times of high demand or grid problems.
The system helps lower the cost of electricity by storing energy when it’s cheap and releasing it when demand is high during the day. This keeps the cooling going even when there aren’t enough power in the summer.
Performance and Operational Advantages
Beyond safety benefits, the vanadium flow battery system also delivers strong lifecycle performance and advanced operational capabilities.
Key technical specifications include:
- More than 20,000 charge–discharge cycles
- Operational lifespan exceeding 20 years
- Intelligent Energy Management System (EMS) enabling automated peak-shaving, load response, and remote monitoring
Because the system is modular, it can be installed in unused basement areas without taking up parking spaces or green zones. This makes it great for commercial and urban developments.
Expanding Role of Vanadium Flow Batteries
This project shows how underground urban areas can be turned into safe and useful places to store energy. As rules get stricter for lithium-based battery systems in cities with a lot of people, vanadium flow batteries are becoming more popular for storing energy in businesses and factories. They are safer, last longer, and work better.
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