Megacell

High Power,
Not Just Energy.

Grid-scale storage redefined: unmatched power density, ultra-fast charge (5 minutes), and lithium-free safety. Megacell delivers continuous nominal power for the world's most demanding grid applications.

Non-flammable, recyclable, and designed for 30,000+ cycles.

Up to 50.1 MW • 4,174 kWh • Charges in 5-minutes

Key Benefits

From frequency regulation to blackout prevention, Megacell delivers full nominal power continuously with the lowest OPEX in its class.

Power iconUnmatched Power

Continuous nominal output with peak rates up to 24C for high-demand grid events.

Cycles icon30,000+ Cycles

Ultra-long lifetime and minimal degradation under intensive duty cycles.

Safety iconLithium-Free & Safe

Non-flammable, recyclable carbon-based chemistry with wide operating temperatures.

Modular iconModular & Scalable

Factory-assembled units for fast rollout; scale from MW to multi-site fleets.

Grid iconGrid-Forming

Supports islanding, black-start, and dynamic stability for renewables integration.

OPEX iconLowest OPEX

Simplified maintenance, robust design, and OpenEMS automation reduce lifetime cost.

Megacell Product Line

Select the power block that matches your grid service window. All models designed for 5-minute high-power charge/discharge.

Wattium Megacell family: cell, module, rack, container

Megacell-2

Compact block for distributed assets and substation upgrades.

Power2 MW
Energy167 kWh
Full Charge Time 5 min
Savings per MW·cycle*≈83–85%

Megacell-10

Mid-scale grid services, ultra-fast response and high cycle count.

Power10 MW
Energy835 kWh
Full Charge Time 5 min
Savings per MW·cycle*≈83–85%

Megacell-50

Flagship unit for system-level stabilization and frequency containment.

Power50.1 MW
Energy4,174 kWh
Full Charge Time 5 min
Savings per MW·cycle*≈83–85%

* Savings estimate is versus comparable lithium‑ion BESS on a €/MW·cycle basis, and depends on duty cycle, ambient conditions and project configuration. Indicative only; varies by application. Benchmarks used: Wattium vs. Li‑ion: (Tesla, CATL, BYD).

Target Markets & Use Cases

Where Megacell creates outsized value: fast-response, power-dense services that lithium struggles to deliver cost‑effectively and safely.

Frequency iconFrequency Regulation

Sub‑second response and sustained nominal power for primary/secondary frequency control (FCR/FRR).

  • ≤200 ms response (FCR/FRR)
  • Continuous nominal power
  • ≈83–85% lower €/MW·cycle vs lithium (Tesla/CATL/BYD)

Peak shaving iconUltra‑fast Peak Shaving

Clip short spikes and demand charges with 5‑minute charge/discharge and high C‑rates.

  • Full cycle in 5 minutes
  • Up to 24C discharge
  • Ideal for 1–15 min spikes

Grid forming iconGrid Forming & Black Start

Grid‑forming operation, islanding support, and black‑start capability for resilient microgrids.

  • Grid‑forming / islanding
  • Black‑start capable
  • Virtual inertia support

Power quality iconPower Quality (Sags/Swells)

Instant voltage support and ride‑through for industrial loads and renewable intermittency.

  • ms‑level response
  • Voltage ride‑through
  • Flicker / harmonics mitigation

Kinetic energy recovery iconKinetic Energy Recovery

Capture and reuse short‑burst energy (ports, cranes, rail, elevators) with ultra‑high cycle life.

  • 30,000+ full‑power cycles
  • 5–60 s burst windows
  • High power per footprint

Renewables iconRenewable Ramping & Firming

Stabilize solar and wind output with sub‑second ramping and 5‑minute full‑cycle firming, enabling higher renewable penetration without curtailment.

  • Sub‑second ramping
  • 5‑minute firming window
  • Curtailment reduction

Port and rail buffer iconRailway / Port Power Buffer

Absorb and deliver short, high‑power bursts for cranes, shore power and rail electrification, reducing demand charges and infrastructure stress.

  • 5–60 s high‑power bursts
  • Demand charge reduction
  • Infrastructure stress relief

Industrial backup iconIndustrial Backup & Ride‑Through

Protect critical lines from sags, swells and micro‑outages with instantaneous support and seamless ride‑through.

  • ms‑level transfer
  • Sag/swell correction
  • Seamless ride‑through

Custom applications iconCustom Applications

Have a unique duty cycle or grid requirement? Talk to us — we tailor power blocks, control modes and integration to your use case.

  • Tailored duty cycles
  • Grid‑code compliance
  • Integration adapters (EMS/SCADA)

Looking for a different application? Contact us — we tailor control modes and integration to your grid code.

Talk to an Engineer

Discuss your grid code or performance requirements with our technical team.

Technology

Unlike lithium-based storage, Megacell's carbon-based, lithium-free design enables continuous nominal power, rapid cycling, and non-flammable safety. The compact architecture and high specific power deliver immediate response for frequency events, renewables smoothing, and sub-5-minute services.

  • Carbon-based, lithium-free; recyclable and safe by design.
  • High C-rate capability (peaks up to 24C) for short-duration grid services.
  • Wide operating temperature, industrial-grade IP enclosure.
  • >30,000 cycles; minimal degradation under intensive use.

Monitoring & Control

OpenEMS: free cloud monitoring system with edge automation, utility-grade protocols, and real-time orchestration.

  • Protocols: Modbus, MQTT, WebSockets, REST API.
  • Core control modes: Direct Real Power Control; Ramp Rate Control; Frequency Support; Voltage Control; Remote & Automated Control; Power Factor Control; Virtual Inertia; Island/Grid-Forming Mode; Black Start Capability.
  • Fleet management, remote diagnostics, automated dispatch.
  • Role-based access, audit trails, configurable alerts.

Download Megacell Datasheet

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Configure & Pre-Order

Tell us about your project and we'll propose a configuration, pricing, and deployment plan.

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Pre-orders now open. Shipments begin Q1 2026, subject to project validation.

Contact

We operate from Barcelona and Bellaterra. Reach out for technical, commercial, or partnership inquiries.

Head Office

Tech Barcelona - Pier 01
Plaza Pau Vila 1, 2B
08039 Barcelona (Spain)

ICN2

INSTITUT CATALÀ DE NANOCIÈNCIA I NANOTECNOLOGIA (ICN2)
Edifici ICN2
UAB Campus, Bellaterra (Barcelona)
08193, Spain

Phone

+34 932 15 77 35
+34 635 93 45 92

Email

info@wattium.tech

sales@wattium.tech

Pre-orders and technical requests typically receive a response within 2–3 business days.