Energy trading company Foxwell Power (FWP) has contracted Saft to supply a battery storage solution for a 356MWh project in Taiwan.
France-headquartered Saft, which manufactures batteries and battery energy storage system (BESS) technologies and has been owned since 2016 by French oil & gas major TotalEnergies, announced the deal last week (24 October).
Customer Foxwell Power is a provider of energy trading, battery storage, energy efficiency and energy-related IT services, and is a subsidiary of renewable energy developer Shinfox Energy. Shinfox Energy is, in turn, part of the Foxlink Group, a supplier of cabling and other components to customers, including Apple.
The BESS project will be deployed in Taichung, Taiwan’s second-largest city, about 170km from Taipei, performing frequency regulation ancillary services and peak time-shifting of renewable energy generation.
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At the recent Energy Storage Summit Asia 2025 conference, hosted in Manila, Philippines, by our publisher Solar Media, Saft’s energy storage system (ESS) sales & marketing director, Vincent Le Quintrec, said the company has been active in Taiwan’s BESS market for 10 years.
This includes previous projects for Foxwell, and Le Quintrec discussed one in a presentation on the versatility of battery storage to replace thermal generation on the world’s electric grids.
The 50MW/172.5MWh project in the northern county of Yilan was completed in 2024 to deliver the Energy Shifting with Dynamic Regulating Function Reserve (E-dReg) ancillary service.
E-dReg was introduced in July 2022 into the energy trading platform of grid operator and utility Taipower Corporation (TPC). It enables energy storage to be used to quickly charge and discharge large amounts of electricity to enhance the flexibility of power dispatching.
It requires sub-second response times from the BESS. As Le Quintrec pointed out in his presentation, the service was created in direct response to the increasing penetration of renewable energy and load-shifting demand.
“Frequency regulation, E-dReg, is like a shock absorber. There is a shock you absorb. It’s like the suspension of a car, making sure there is no sharp turn, there is no big bump, and all the grid is stable,” Le Quintrec said.
The BESS supplied to the Yilan project was tailored for Foxwell’s specific needs of delivering E-dReg as mandated by the utility.
“Basically, the BESS is at about 50% state of charge (SoC) always and turning around, charging, discharging very quickly again, responding to signals in less than 100 milliseconds.”
For the latest project, Foxwell’s biggest priorities included cybersecurity, and Saft claimed it was able to satisfy those with a European-made cybersecurity solution that embeds control hardware and software from module to system level.
Saft will supply 108 units of its Intensium Shift (I-Shift) modular lithium iron phosphate (LPF) containerised BESS solution to Foxwell’s Taichung project. I-Shift, launched in 2022 with 3MWh storage capacity in a 20-foot standard container form factor.
The project in Taichung will be among the biggest on the island, joined by other sizeable projects, including a 311MWh system completed by NHOA—the Italian BESS integrator owned by Taiwan Cement Corporation—in late 2023 and more recently a 262.43MWh project developed by Billion Watts Technologies and Shinshin Credit Corporation went online in the first quarter of this year.
Both of those projects were delivered specifically for involvement in the E-dReg ancillary services market. According to TPC, around 500MW of BESS was active in E-dReg as of February this year.
