Storage duration & economics
Conventional storage lasts 2–6 h and still needs grid or diesel backup — high cost, unmet carbon goals.
XCITY ENERGY · FGS · FIRM GREEN SUPPLY SYSTEM
24/7 carbon‑free power
as a standard product.
FGS delivers firm, always-on green power to mines, data centers and heavy industry — a modular, grid-forming energy platform built on long-duration CO₂ dry-ice storage.
- Long-Duration Storage
- Grid-Forming
- Intelligent Dispatch
- Modular Delivery
Lithium BESS
2–6 h
FGS Store
>20 h
CO₂ dry-ice storage — inert, non-flammable, 30–50 yr design life.
>20h
Long-duration discharge capacity
≤10ms
Primary frequency / voltage response
$0.04/kWh
Levelized all-in cost of power
30–50yr
System design life
The challenge
A new energy foundation for AI-scale compute
Training, inference and fine-tuning drive large, tidal power swings. Continuous stability, instantaneous power support and multi-source time-matching all sit beyond the reach of conventional grids, diesel and short-duration storage.
Instantaneous power support
Legacy grids struggle with the sharp power swings of AI clusters, causing resource mismatch and heavy capex.
Renewable intermittency
Solar and wind variability can't meet always-on demand; abundant clean power is curtailed and wasted.
Rapid deployment
Energy build-out is a key bottleneck, yet AI growth imposes ever-tighter deployment timelines.
Dispatch controllability
Next-gen infrastructure must optimize continuously across balance, cost and carbon.
Electricity cost
Without maximizing renewables, the total cost of power for an AI cluster stays stubbornly high.
Market driver
Traceable green power is now a market entry requirement
Under the EU's Carbon Border Adjustment Mechanism, verified renewable supply is no longer optional. Carbon tariffs erode price competitiveness, while green procurement brings certification, reliability and cost challenges of its own.
- 2028
- Full implementation — no buffer period; tighter oversight extends to more downstream goods.
- 180+
- Product categories affected — cement, aluminium, fertilizer, electricity and derived goods.
- Full-chain
- Emissions accounting — power-related carbon is fully counted; green supply becomes the key variable.
The product
An integrated source–storage–grid–load system
Built around long-duration CO₂ dry-ice storage, FGS orchestrates generation, storage, network and load through multi-energy complementarity and intelligent control — delivering efficient, low-carbon, always-on power in a closed-loop green energy ecosystem.
Modular architecture
On-demand combination of generation, storage, backup, control and cloud platform.
Multiple specifications
Unified architecture and standard interfaces; capacity and specs configured to need.
Selectable configuration
Off-grid, weak-grid, dual-mode or brownfield retrofit — chosen to your standards.
Lifecycle operation
Full-lifecycle service from design and sizing to delivery and operational optimization.
Five subsystems, one coordinated platform
Next-gen storage
FGS Store
CO₂ dry-ice storage with a small high-performance battery buffer for large-capacity, long-duration output.
Multi-source input
FGS Generate
Integrates solar, wind, grid, diesel and other storage as one clean supply base — 10–35 kV and 400 V AC intake, built for unstable renewable output.
Smart energy brain
FGS Control
Forecasting, multi-energy dispatch and full carbon-footprint accounting in one digital control layer.
Energy security
FGS Secure
Full-domain online monitoring, multi-level interlock protection, standardized operations and dedicated emergency response plans contain system risk end to end.
Load management
FGS LoadM
Coordinates flexible loads and taps waste heat and cooling to maximize overall energy efficiency.
FGS Store
CO₂ dry-ice long-duration storage as the differentiator
Shift energy across hours, overnight and across days — cutting reliance on stacked short-duration batteries and maximizing renewable use.
>20 h
Long-duration capacity
≤10 ms
Primary freq / voltage response
< $0.04
Levelized cost per kWh
< 60 s
Black-start voltage rebuild
< 3%
Step-up harmonic distortion
Grid-forming
Inertia & damping support
*Figures from source technical data; final values per purchased model, configuration list and acceptance criteria.
FGS Control · FGS LoadM
Optimizing across reliability, cost and carbon — automatically
A closed five-stage control loop keeps the system balanced in real time, following a clear order of priorities.
- 1
Predict
Weather, generation and load forecasting
- 2
Optimize
Day-ahead / intraday plans and storage strategy
- 3
Execute
Real-time source–storage–grid–load coordination
- 4
Protect
Fault detection, switching and recovery
- 5
Operate
Alerts, reporting and asset management
Control principle
- 1Critical load first
- 2System stability
- 3Low-cost operation
- 4Low-carbon optimization
AI-aware load management
An advanced EMS grades and manages compute-base, rigid inference and flexible training / fine-tuning loads — dynamically shifting off-line compute to off-peak windows aligned with renewable output, absorbing clean power and cutting peak cost.
-
Renewable output
Time-series wind & solar generation
-
Multi-source storage
Buffers peaks and smooths troughs
-
EMS orchestration
Grades and schedules every load
-
Graded compute loads
Rigid inference vs. flexible training
Deployment
Four standard deployment modes, one product base
The same architecture and interfaces adapt to site conditions — from no grid at all to an existing diesel or PV-storage plant.
No grid coverage
Pure off-grid
Renewables + long-duration storage + backup, with black-start capability.
Frequent curtailment or fluctuation
Weak-grid enhanced
Peak shaving, fault ride-through and guaranteed supply for critical loads.
Grid + islanding switchover
On/off-grid dual mode
Economical everyday operation; switches to island mode on fault.
Existing diesel or PV-storage
Brownfield upgrade
Retain usable assets; add FGS Store and FGS Control.
Product family
Power class defines the family; storage duration completes the model
Four power classes share one architecture, one set of interfaces and one control strategy.
FGS 10
5–10 MW
Pilot site / single production unit
Entry model · rapid deployment
FGS 50
10–50 MW
Mid-size mine / data center
Core model · standard delivery
FGS 100
50–100 MW
Large mine / industrial park
Flagship · zoned supply
FGS X
100 MW+
Mining cluster / mega campus
Custom · multi-site coordination
Each power model offers selectable storage-duration packs — covering intraday balancing, overnight supply and multi-day assurance.
Product advantage
Radically green. Compellingly economical.
Zero lifecycle emissions and a levelized cost that undercuts conventional storage — without trading away safety.
Ultra-low-carbon
Zero lifecycle emissions — sidestepping carbon-tariff risk entirely.
0
Operational carbon
24/7
Stable power output
With ample regional wind and solar, the architecture delivers 24/7 net-zero power — fully aligned with EU CBAM, removing cross-border cost and policy barriers.
Superior economics
Levelized cost as low as $0.042/kWh, with O&M at one-third of lithium storage.
$0.04
All-in cost / kWh
1/3
O&M vs. lithium
Highly competitive 30-year lifecycle cost and long service life thin out capex further — shorter payback and a clear economic edge over conventional storage.
Inert working medium
Chemically stable, non-toxic, non-flammable CO₂ eliminates combustion and explosion risk. A 30–50 year design life stays safe and stable even in extreme heat or cold.
Cooling–heat–power cogeneration
Beyond single-purpose storage: simultaneous power, heat and cooling. Serves industrial heat and data-center cooling directly, lifting overall energy value and creating multiple revenue streams.
Efficient modular deployment
Custom modular fabrication replaces traditional construction — base deployment in as little as three months, dramatically compressing build timelines.
Use cases
Built for the loads that cannot go dark
Five core markets where power is the binding constraint on growth, cost and carbon.
Key operational pain points
-
High cost share
Power is the largest rigid operating cost; legacy solutions can't reach zero carbon.
-
Strict reliability
Uptime Tier IV means any interruption risks major loss.
-
Heavy cooling load
Dense compute generates intense heat; conventional cooling is energy-hungry.
Solution — core value
-
Tier IV reliability
Multi-redundant supply, 24/7, no outage risk.
-
PUE below 1.1
Cogen waste-heat recovery cuts cooling energy.
-
CBAM-compliant
100% green power lifts ESG rating.
Key operational pain points
-
15–40% of opex
Energy is a persistently high share of operating cost.
-
Weak remote grids
Poor coverage; diesel gensets fail often and are hard to maintain.
-
ESG & carbon pressure
Tightening carbon-neutrality policy raises tariff and rating risk.
Solution — core value
-
Green transition
Slash carbon and diesel use; lift ESG ratings.
-
Radical economics
Cut cost per kWh by 50%+, expanding margin.
-
Strategic asset
From passive consumer to active energy producer.
Key operational pain points
-
Strict power quality
Precision manufacturing is sensitive to voltage/frequency; dips scrap product.
-
Rising carbon cost
CBAM exposure squeezes export margins; legacy supply is non-compliant.
-
Energy cost pressure
Volatile tariffs erode competitiveness without optimization.
Solution — core value
-
Zero interruption
Solar + storage + microgrid keeps lines running.
-
CBAM to zero
100% green self-use removes carbon footprint.
-
Cost optimization
Peak–valley arbitrage and self-use cut energy spend.
Key operational pain points
-
Grid-outage exposure
Distributed microgrids must ride through wide-area grid damage.
-
Short-duration limits
Electrochemical storage can't sustain critical community loads.
-
Diesel dependence
Backup gensets mean fuel reliance, pollution and high cost.
Solution — core value
-
Safe deployment
CO₂ storage carries no safety risk — sited close to homes.
-
Multi-source input
Compatible with many sources when the main grid is down.
-
Reverse supply
Grid-forming storage can feed power back to stabilize the grid.
Key operational pain points
-
Geology-bound options
Today's long-duration options demand specific geology or carry environmental drawbacks.
-
Blocked rollout
Those limits stall large-scale deployment of long-duration capacity.
-
Curtailed clean power
Vast, low-cost wind and solar is curtailed and can't develop as a system.
Solution — core value
-
Ultra-long duration
First to enable cross-day and cross-season storage for effective energy shifting.
-
Controllable cost
Capacity scales with CO₂ dry-ice storage — far below lithium iron phosphate.
-
Industrial synergy
Supplies heat, cooling and CO₂ to neighboring industries for maximum reuse.
Purpose-built value beyond the core markets
Commercial complexes & large buildings
- Cogen efficiency
- Waste-heat-driven cooling saves 30%+ vs. central HVAC.
- Green landmark
- Near-zero-carbon buildings meet ESG standards and lift brand value.
- Emergency backup
- Standalone backup keeps elevators, security and lighting running.
Remote islands & off-grid communities
- Self-sufficient microgrid
- Island wind and solar end reliance on costly diesel.
- Cost down, economy up
- Energy spend down 40%+, freeing funds for local industry.
- Policy tailwind
- Eligible for EU island-decarbonization funds — up to 60% of capex.
Commercial clarity
A clear order boundary for procurement, build and acceptance
What ships as standard, what is optional and what is delivered as service — defined before the quote.
Standard supply
FGS Store, FGS Control, system integration and core control strategy.
Optional modules
FGS Generate, FGS Secure, step-up, distribution and charging facilities.
Product services
Sizing, delivery management, commissioning, training, maintenance and optimization.
Three steps turn site conditions into a quotable configuration
- Step 1
Define supply level
Clarify peak load, critical load, allowable interruption, expansion plan and green-power ratio.
- Step 2
Select architecture
Choose off-grid or dual-mode based on solar/wind, grid, diesel, site and environment.
- Step 3
Lock model config
Set FGS power model, storage-duration pack, backup capacity, control functions and expansion interfaces.
Deliverable: model + module list + performance specs + commercial case + delivery boundary + implementation plan
Delivery
A five-stage standard product delivery process
From data checklist to long-term optimization — the same process on every site.
- 01 2–4 wks
Requirements
Data checklist, site diagnosis, supply level and preliminary model.
- 02 4–8 wks
Selection
Architecture, single-line diagram, module list, specs and formal quote.
- 03 Per config
Delivery design
Construction drawings, procurement pack, grid/protection design, plan.
- 04 Per scale
Install & commission
Installation, joint commissioning, testing, training and handover.
- 05 Long-term
Product service
Remote monitoring, strategy tuning, preventive maintenance, upgrades.
Turning energy infrastructure into an operable standard product.
Send us your peak load, critical load and site conditions. We come back with a model, a module list, performance specs and a commercial case.
- Partnerships
- Investment & partnership team
- Headquarters
- New York City, USA
- Consultation
- One-to-one on collaboration details