GridSpan™
Utility-Scale DC Block
Energy storage built for flexible-duration, lower lifetime cost, and simpler deployment.
Syntropic’s Flagship Flex-Duration Storage Platform
Configured for the project.
Built for long-term ownership.
GridSpan is Syntropic’s flagship utility-scale storage platform, built on sodium-chromium-oxide chemistry, NaCrO₂ (NCO), and a standardized modular DC architecture.
With stable thermal behavior and SelfTherm™ passive thermal management, GridSpan is designed to reduce active cooling needs, preserve stored energy, simplify operation, and improve lifecycle economics.
20 min–20 hr
Configurable discharge duration.
25+ yr
Service life
20,000+
Cycle life target
≥97.9%
RIT-validated round-trip efficiency
One platform.
Two purpose-built configurations.
Energy configuration
Configure GridSpan for peaking, firming, resilience, and other multi-hour storage applications.
Power configuration
Add GridSurge shelves for fast-response applications where power quality, high-rate cycling, and uptime matter.
How GridSpan changes the project case
CAPACITY THAT MATCHES THE JOB
Configure discharge from 20 minutes to 20 hours for peaking, firming, resilience, and other project-specific operating windows. Need more energy capacity or a longer discharge window? Scale within the modular GridSpan platform.
One architecture, sized to the duty cycle.
Safety-first for clearer review
GridSpan is built on NCO chemistry designed for stable thermal behavior under stress. Abuse testing showed no propagation under defined test conditions, giving project teams clearer evidence for permitting, underwriting, and safety review.
Designed for simpler siting and review.
A long-life asset, without planned augmentation
GridSpan is designed for 25+ year service life and 20,000+ cycles, with no mid-life augmentation planned. SelfTherm™ passive thermal management reduces active cooling dependency, helping lower maintenance burden and lifecycle cost.
A cost model built for long-term ownership.
Technical Specifications
Built on Evidence
Validated where project risk is decided
Storage projects are evaluated by more than performance specs. Safety behavior, standards progress, and supply-chain clarity shape approvals, insurance, financing, and procurement decisions.
Abuse-tested safety behavior
RIT testing showed thermally stable behavior, with no explosion or propagation observed under defined abuse-test conditions.
Third-party validation
Cell UL 9540A testing completed; UL1973, system-level UL 9540 and UL9540A testing pending. Continued RIT testing in progress.
Supply Chain Confidence
Zero lithium, cobalt, or nickel, with traceable sourcing and a clear non-FEOC alignment pathway.
Explore Other Solutions
DATA CENTERS & Fast-Response Power
GridSurge™
The high-power configuration of the GridSpan platform, tuned for data centers, grid services, and critical facilities. Sized to deliver power on demand, without paying for energy capacity you won’t use.
RESIDENTIAL · TELECOM · C&I
Distributed Solutions
Tenet™ is leading sodium-ion into the U.S. residential storage market, with select light-commercial applications. Pillar48™ and PillarX™ are planned telecom and C&I solutions.
Tell us about your application
Energy storage is infrastructure. Let’s plan it that way.
If your project is constrained by safety requirements, siting complexity, idle losses, or long-term cost of ownership, GridSpan offers a different path.
- Match duration, power, and duty-cycle requirements
- Evaluate siting, mitigation, and approval considerations
- Assess lifecycle performance and total cost of ownership