Wattium
Wattium develops Megacell, a lithium-free, carbon-based grid-scale energy storage system for utilities, grid operators, renewable developers, and industrial facilities, offering modular 2–50 MW units with 5-minute charging and 30,000+ cycle lifetime. Pre-orders are open with first deliveries targeted Q1 2026.
- Company typePrivate
- Founded-
- HeadquartersBarcelona, Spain
- Headcount—
- GTM typeB2B
- OfferingHardware or Manufacturing
What Wattium does
Wattium (legal entity: NAPPTILUS BATTERY LABS SL) is a Barcelona-based, privately held developer of Megacell, a carbon-based, lithium-free grid-scale energy storage system targeting high-power, short-duration grid services. Founded in 2019, the company positions its chemistry as differentiated from incumbent lithium-ion battery energy storage systems (BESS) on safety (non-flammable), recyclability, cycle life (30,000+ cycles), and per-MW·cycle economics (claimed ~83-85% lower €/MW·cycle versus Tesla, CATL, BYD). The product line comprises three modular, factory-assembled units — Megacell-2 (2 MW / 167 kWh), Megacell-10 (10 MW / 835 kWh), and Megacell-50 (50.1 MW / 4,174 kWh) — all featuring 5-minute full charge/discharge, ≤200 ms frequency-regulation response, peak rates up to 24C, and grid-forming with black-start capability. Hardware is paired with OpenEMS, a free cloud monitoring and edge-automation platform supporting Modbus, MQTT, WebSockets, and REST API integration. The company monetizes through project-based hardware sales and professional services (deployment planning, EMS/SCADA integration, grid-code compliance), with pre-orders open and first deliveries targeted for Q1 2026. Target customers are utilities, transmission/distribution system operators, renewable energy developers, and industrial facilities requiring frequency regulation, renewable ramping/firming, peak shaving, grid forming, and high-power-burst buffering. The company is founder-led (CEO Roger Casals, CTO Dani Rueda, COO Jordi Aibar) with an embedded research partnership with ICN2 (Institut Català de Nanociència i Nanotecnologia) on the UAB Campus and advisor ties to UPC, supported by EU/CDTI grant funding (FOTOSWIRX, REVOLT) rather than disclosed institutional venture capital.
Wattium firmographics
Firmographics- Name
- Wattium
- Legal name
- NAPPTILUS BATTERY LABS SL
- Website
- https://www.wattium.tech
- Company type
- Private
- Operating status
- Operating
- Short description
- Wattium develops Megacell, a lithium-free, carbon-based grid-scale energy storage system for utilities, grid operators, renewable developers, and industrial facilities, offering modular 2–50 MW units with 5-minute charging and 30,000+ cycle lifetime. Pre-orders are open with first deliveries targeted Q1 2026.
- Ownership category
- akta.pro rank
Wattium industry classification
Industry- Product category
- Grid-Scale Energy Storage Systems
- NAICS
- Electric Power Generation, Transmission and Distribution (2211)
- SIC
- Electric Services (4911)
- akta.pro primary industry
- Distributed Storage (Behind-the-Meter Batteries) (EUAMAJAE)
- akta.pro secondary industries
- Microgrid Controllers, Energy Management & DER Orchestration (MGC, SCADA, Optimization) (EUAFAJAH), DERMS & Microgrid Control Software (EMS/SCADA/DERMS) (EUAMAJAG), Resilience, Backup Power & UPS-Integrated BTM Systems (Black Start, Ride-Through) (EUAFAJAK)
Keywords
Where Wattium is headquartered
LocationHeadquarters
- HQ city
- Barcelona
- HQ country
- Spain
- HQ region
- Europe
Offices2 records
Markets served
Wattium business model
Business model- GTM type
- B2B
- Offering type
- Hardware or Manufacturing
- Cost components
- Technology or R&D, Personnel, Supply Chain, Operations, Marketing or Sales
Revenue model
- Megacell Hardware Sales: Sale of Megacell energy storage products (Megacell-2, Megacell-10, Megacell-50) to utilities, grid operators, and industrial facilities. Products are configured and priced based on project requirements and deployment scale.
- Professional Services: Technical consulting, deployment planning, and integration services for Megacell installations including EMS/SCADA integration adapters and grid-code compliance configuration.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Unit Pricing | Multi-year contract | Megacell-2: 2 MW / 167 kWh compact block for distributed assets |
| Unit Pricing | Multi-year contract | Megacell-10: 10 MW / 835 kWh mid-scale grid services unit |
| Unit Pricing | Multi-year contract | Megacell-50: 50.1 MW / 4,174 kWh flagship unit |
Go-to-market motion3 records
Distribution channels1 record
Marketing channels5 records
Wattium product offering
Product offeringCore offering
Wattium designs and sells Megacell, a lithium-free, carbon-based grid-scale energy storage system delivered as modular, factory-assembled units (Megacell-2 at 2 MW/167 kWh, Megacell-10 at 10 MW/835 kWh, and Megacell-50 at 50.1 MW/4,174 kWh) for high-power, short-duration grid services. The product supports 5-minute full charge/discharge, peak rates up to 24C, ≤200 ms frequency-regulation response, and 30,000+ cycle lifetime, and is orchestrated by the OpenEMS cloud monitoring and control platform. The company targets utilities and grid operators, renewable energy developers, and industrial facilities with project-based, multi-year contracts.
Product overview
Wattium offers the Megacell line of grid-scale energy storage products based on carbon-based, lithium-free chemistry. The portfolio consists of three modular power block models: Megacell-2 (2 MW/167 kWh), Megacell-10 (10 MW/835 kWh), and Megacell-50 (50.1 MW/4,174 kWh), all featuring 5-minute charging capability and designed for high-power grid services. All models are supported by the OpenEMS monitoring and control platform providing cloud-based fleet management, remote diagnostics, and automated dispatch capabilities.
Differentiator
Problem solved
Functional benefit
Brands
- Megacell: Grid-scale energy storage product line featuring carbon-based, lithium-free battery technology with ultra-fast 5-minute charging and up to 50.1 MW power output. Product family includes Megacell-2 (2 MW/167 kWh), Megacell-10 (10 MW/835 kWh), and Megacell-50 (50.1 MW/4,174 kWh).
- OpenEMS
Products and services
- Megacell-2 Compact grid-scale energy storage block for distributed assets and substation upgrades, delivering 2 MW continuous nominal power with 167 kWh energy capacity, 5-minute full charge/discharge, and approximately 83-85% lower €/MW·cycle versus lithium-ion alternatives. Designed for utilities, grid operators, and industrial sites.
- Megacell-10 Mid-scale grid services energy storage unit delivering 10 MW continuous nominal power with 835 kWh energy capacity. Built for ultra-fast response and high cycle count applications including frequency regulation and peak shaving.
- Megacell-50 Flagship container-scale energy storage unit delivering 50.1 MW continuous nominal power with 4,174 kWh energy capacity. Designed for system-level stabilization, frequency containment, and other demanding grid applications.
Quantifiable outcome
- 83-85% lower €/MW·cycle operating cost versus lithium-ion BESS (Tesla, CATL, BYD)
- +4 more outcomes
Companies that use Wattium
Customer profileSegments3 records
Ideal customer profiles3 records
Wattium technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- Yes
- API docs
- API detail
Core technology
AI maturity
App detail
Feature4 records
Wattium partnerships and signals
Strategic signalPartnerships
Four partnerships are on record, tiered minor and core.
- FOTOSWIRX Consortium (CDTI Misiones 2024)minorWattium (Napptilus Battery Labs) participates in FOTOSWIRX project funded by CDTI under Recovery, Transformation and Resilience Plan - NextGenerationEU. Consortium develops advanced image sensors in SWIR and X-ray bands based on CMOS semiconductor technology. Napptilus Battery Labs participation budget: €213,558 with grant of €114,814.39.
- IMASENIC Advanced Imaging (Consortium Leader)minorLeader of FOTOSWIRX consortium developing advanced photonic sensors. Partner companies include: IMASENIC Advanced Imaging (leader), LABERIT Sistemas, ArcelorMittal Innovación Investigación e Inversión, IDNEO Technologies, and Napptilus Battery Labs.
- ICN2 (Institut Català de Nanociència i Nanotecnologia)coreClose research partnership with ICN2 for cutting-edge materials research to advance Megacell technology. Co-founder and advisor Pedro Gómez-Romero leads research collaboration at ICN2. This collaboration ensures solutions remain at the forefront of energy storage innovation with continuous improvements in performance, safety, and sustainability.
- REVOLT ProjectminorRe-EVOLución de la Tecnología de baterías project developing integral hybrid cells based on 3D electrodes/electrolytes constructed from nanomaterials. Funded by NextGenerationEU, Ministry of Science and Innovation under State Research Plan 2021-2023.
Scale indicators7 records
Recent moves6 records
Expansion highlights6 records
Wattium competitors and assessment
Company assessmentDirect peers
- Tesla: Tesla's Megapack is the leading utility-scale lithium-ion BESS product and is explicitly named by Wattium as a cost benchmark. Both compete for the same utility/grid-operator customers for grid-stabilization and renewable-integration projects.
- Fluence Energy: Fluence is a top-tier grid-scale battery energy storage provider serving utilities and developers with lithium-ion systems plus integrated software/OSM controls — a directly comparable business model and customer base to Wattium.
- BYD: BYD is one of the largest vertically integrated lithium-ion BESS manufacturers cited by Wattium as a cost comparator. Both target utility-scale and C&I storage projects globally.
- CATL: CATL is the world's largest lithium-ion battery maker and a leading utility-scale BESS supplier, named by Wattium as a cost benchmark. Both sell modular containerized battery storage to utilities and grid operators.
- ESS Inc. ESS Inc. is the closest direct peer in alternative-chemistry long-duration storage, commercializing iron flow batteries for grid-scale applications. Both are pursuing non-lithium chemistries to displace lithium-ion BESS for utility customers.
- Form Energy: Form Energy is developing iron-air batteries for grid-scale, multi-day storage applications. Both are non-lithium, US/EU-focused challengers targeting utility-scale energy storage incumbents.
- Invinity Energy Systems: Invinity commercializes vanadium flow batteries for grid-scale and commercial storage. It is a relevant alternative-chemistry grid-storage peer with a similar early-commercialization profile to Wattium.
- Energy Vault: Energy Vault offers grid-scale energy storage using gravity and kinetic-mechanical approaches, plus hybrid BESS-gravity systems. It pursues the same utility customers and growth-stage public-market narrative as Wattium.
Broad incumbents
- Saft (TotalEnergies): Saft, owned by TotalEnergies, is an established industrial battery manufacturer with a broad portfolio including grid-scale lithium-ion storage. It is a broader incumbent in the same addressable market.
- ABB: ABB supplies grid solutions, power-electronics, and energy storage systems to utilities and grid operators globally. It is a broad incumbent that competes for the same grid-stability and storage-integration wallet as Wattium.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat4 records
Key risks7 records
Key highlights7 records
Customer concentration
Wattium social profiles
Digital presenceWattium financial estimates
Financial estimateRevenue estimate
Valuation estimate
Wattium leadership team
Management profileNumber of profiles
Profiles6 records
Wattium funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Wattium M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Wattium
What does Wattium do?
Wattium designs and sells Megacell, a lithium-free, carbon-based grid-scale energy storage system delivered as modular, factory-assembled units (Megacell-2 at 2 MW/167 kWh, Megacell-10 at 10 MW/835 kWh, and Megacell-50 at 50.1 MW/4,174 kWh) for high-power, short-duration grid services. The product supports 5-minute full charge/discharge, peak rates up to 24C, ≤200 ms frequency-regulation response, and 30,000+ cycle lifetime, and is orchestrated by the OpenEMS cloud monitoring and control platform. The company targets utilities and grid operators, renewable energy developers, and industrial facilities with project-based, multi-year contracts.
Is Wattium a public or private company?
Wattium is a private company. It is classified as founder individual operated bootstrapped and is currently operating.
When was Wattium founded?
Wattium was founded in -1.
Where is Wattium based?
Wattium is headquartered in Barcelona, Spain, in the Europe region.
How does Wattium make money?
Two revenue lines are on record. Megacell Hardware Sales are the primary driver. The others are professional Services.
Who are Wattium's main competitors?
Direct peers on record are Tesla, Fluence Energy, BYD, CATL, ESS Inc., Form Energy, Invinity Energy Systems and Energy Vault. Broad incumbents are Saft (TotalEnergies) and ABB.
Does Wattium have an API?
Yes. OpenEMS includes REST API for real-time orchestration, remote diagnostics, automated dispatch, and fleet management. Supports protocols including Modbus, MQTT, WebSockets, and REST API for integration with external energy management systems.
What industry is Wattium in?
Wattium's product category is Grid-Scale Energy Storage Systems. Its primary akta.pro industry code is EUAMAJAE, Distributed Storage (Behind-the-Meter Batteries), with a secondary code of EUAFAJAH, Microgrid Controllers, Energy Management & DER Orchestration (MGC, SCADA, Optimization). Its NAICS code is 2211 and its SIC code is 4911.