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Interconnection uncertainty and price volatility are now routine realities for North American renewable projects. Long-duration energy storage (LDES) closes the gap between when power is generated and when it clears at the best price, directly improving cash-flow stability and overall bankability.
Solar generation tends to peak at midday - when market prices are often soft -while evening demand peaks as solar output falls. Wind output frequently skews to night and early morning, when demand is thinner. By charging in low-price hours and discharging in high-price hours, LDES improves price capture and helps projects meet PPA requirements and capacity accreditation (e.g., ELCC: Effective Load Carrying Capability).

When evaluating storage, many IPPs may first think of lithium-ion (Li-ion). However, for 6–12+ hour applications, the VRFB architecture offers distinct advantages. VRFBs store energy in electrolyte tanks (kWh) and provide power through cell stacks (kW), so you can extend duration simply by enlarging the tanks. While Li-ion systems typically require proportionally larger stacks to reach long durations driving up cost. VRFBs tend to deliver lower $/kWh as duration increases.
Just as important, VRFBs tolerate daily full-cycle operation (DoD = 100%) with minimal degradation, making them well-suited to frequent charge/discharge in step with renewable variability and preserving performance over the long term.

1. Better price capture, steadier revenue
Charge in low-price periods and discharge during evening peaks. Long-duration discharge helps consistently hit high-value windows, supporting PPA compliance and smoothing cash flow.

2. Congestion relief and lower delay risk
During interconnection or upgrade waiting periods, pre-deployed storage can absorb excess generation and shape output. This practical bridge reduces value erosion while construction and interconnection work proceed.

3. High safety and long life reduce risk and TCO
With non-flammable, water-based electrolyte and no thermal-runaway mechanism, VRFBs are well-aligned with siting and permitting in urban and public-facility settings. A 30-year design-life target on our next-generation platform and electrolyte re-use contribute to lower total cost of ownership (TCO) over time.

- Proven reliability:
Backed by 40 years of R&D and nearly 30 years of commercial operation, with continuous operation in the U.S. since 2017. We support clear planning from development through O&M.

- Standards readiness:
Designed and tested to meet key North American standards, including UL 9540, UL9540A, and UL1973. The system is also designed to support NFPA 855, alongside relevant IEC standards (IEC 62932, IEC 62933) —helping streamline permitting and insurance reviews.

- Roadmap for the long term:
Our next-generation V4 platform targets 30-year design life, 15% higher energy density, and 30% lower cost versus prior generation, aligning with the industry’s push toward longer durations and lower lifecycle cost.


LDES has become essential to raise the profitability, reliability, and bankability of renewable projects. If you’re navigating volatile prices, interconnection queues, or stricter performance obligations, we can help right-size 6–12+ hour duration and capacity to your resource profile and market rules.