SeasON Energy

What SeasON Energy does

SeasON Energy AG is a Zürich-based Swiss startup developing absorption heat storage systems based on sodium hydroxide (Natronlauge) sorption technology for seasonal thermal energy storage. The company's system stores excess renewable energy (from PV or solar thermal) during summer and releases it as heat in winter, functioning as a "virtual electrical battery" that relieves winter grid strain. Its claimed energy density of approximately 280 kWh/m³ (up to 6x higher than conventional hot water tanks) and loss-free storage at room temperature differentiate it from both sensible (boiler) and chemical (hydrogen) alternatives. The system is offered in standardized S/M/L sizes for residential use and as XL or custom solutions for industrial applications, with an emerging subscription ("Abo") model for scenarios where charging and discharge are geographically separated.

The company is in an early pilot-validation stage with four known installations: a 5 kW unit at a Frauenfeld commercial building, a 36 kW installation at Swiss Post's Kaltenbach regional distribution center, an 80 kW complex in Bochum, Germany, and a 12 kW system in Buchs AG. Additional target use cases identified on the company's website include data center cooling and PUE reduction, district heating network integration, and industrial process heat and waste heat recovery. Strategic ecosystem relationships include Swiss federal partners Innosuisse, Klimastiftung, and the Bundesamt für Energie (BFE), plus implementation partner Novus Engineering AG and channel partner EKT.

Go-to-market is enterprise field sales with channel support, targeting industrial XL solutions directly via a CCO and project managers, while residential S/M/L sales rely on HLK (HVAC) specialist partners. Revenue mechanics combine one-time hardware sales (quote-based, multi-year contracts) with a usage-based subscription model for select industrial deployments. The company secured the Watt d'Or 2025 award from the BFE for innovation in seasonal thermal energy storage. No external venture funding rounds or revenue figures are publicly disclosed.

Name

SeasON Energy

Legal name

SeasON Energy AG

Website

https://seasonenergy.ch

Company type

Private

Founded year

2025

Operating status

Operating

Headcount range

1–10 employees

Short description

SeasON Energy AG is a Swiss startup developing sodium hydroxide-based absorption heat storage systems for seasonal thermal energy storage, serving residential, commercial, industrial, and data center customers in Switzerland and Germany.

Ownership category

akta.pro rank

Product category

Thermal Energy Storage Systems

NAICS

Ventilation, Heating, Air-Conditioning, and Commercial Refrigeration Equipment Manufacturing (33341)

SIC

Heating Equipment, Except Electric & Warm Air Furnaces (3433)

akta.pro primary industry

Thermochemical Energy Storage (Sorption, Chemical Looping) (EUAFANAE)

akta.pro secondary industries

District Heating & Cooling Thermal Storage (Network-Integrated TES) (EUAFANAH), Industrial Process Heat TES (Steam, Kilns, Furnaces, Waste-Heat Coupling) (EUAFANAI), Thermal LDES (High-Temperature, Molten Salt, Carnot/Heat-to-Power) (EUAFADAC)

Keywords

• Sorption heat pumps
• Thermal energy storage
• Seasonal heat storage
• Absorption heat storage
• Building heating systems

Headquarters

HQ city

Zürich

HQ country

Switzerland

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B and B2C

Offering type

Hardware or Manufacturing

Cost components

Technology or R&D, Supply Chain, Personnel, Operations, Marketing or Sales

Revenue model

1. Absorption Heat Storage Systems: Sale of absorption heat storage systems in standard sizes (S, M, L) for residential and custom XL solutions for industrial applications. Revenue generated from hardware sales and installation.
2. Subscription/Abo Model: Usage-based subscription model where the system can be separated geographically between charging and use. Particularly for industrial applications.

Pricing tiers

Go-to-market motion3 records

Distribution channels3 records

Marketing channels2 records

Core offering

SeasON Energy AG manufactures sodium hydroxide-based sorption heat pumps that deliver long-term, loss-free thermal energy storage at room temperature. The systems store excess summer solar energy for winter heating, achieving roughly 280 kWh/m³ energy density (about six times that of hot water tanks). They are offered in residential (S/M/L) and industrial (XL) sizes for buildings, industry, data centers, and district heating.

Product overview

SeasON Energy offers a single unified product—the SeasON absorption heat storage system—based on sodium hydroxide solution. The product consists of a converter (absorption heat pump) and a storage medium container (working media storage). It is available in standardized formats for residential use (S, M, L sizes) and in XL or custom configurations for industrial applications. The system stores thermal energy from solar sources during summer and provides heating in winter, functioning as a virtual electrical battery for the power grid.

Differentiator

Problem solved

Functional benefit

Products and services

• SeasON absorption heat storage system — residential sizes (S, M, L) Modular sodium hydroxide sorption heat pump and thermal storage unit sized for residential single-family and small multi-family buildings. Designed to capture excess summer solar heat and deliver it as winter space heating and domestic hot water, replacing fossil-fuel heating.

Quantifiable outcome

• Energy density of approximately 280 kWh/m³ (up to 6x higher than hot water tanks)
• +1 more outcomes

Named customers4 records

Segments4 records

Ideal customer profiles2 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature3 records

Partnerships

Eight partnerships are on record, tiered core and minor.

• BFE (Bundesamt für Energie)coreStrategic or Co-development PartnerSwiss Federal Office of Energy - government agency supporting energy innovation. Partnered with SeasON on the Watt d'Or 2025 award. Represents significant government endorsement of the technology.
• InnosuissecoreStrategic or Co-development PartnerSwiss Innovation Agency supporting innovation projects. SeasON has Innosuisse-supported innovation project for technology development.
• KlimastiftungcoreStrategic or Co-development PartnerSwiss Climate Foundation supporting climate protection projects. Partner supporting SeasON's climate-focused innovation.
• Stadt FrauenfeldcoreStrategic or Co-development PartnerCity of Frauenfeld - hosted the first SeasON pilot installation in a commercial building. Key reference customer and development partner.
• Schweizerische PostcoreStrategic or Co-development PartnerSwiss Post - hosted second pilot installation at their regional distribution center in Kaltenbach. Key enterprise reference customer.
• Novus Engineering AGcoreImplementation/ SI/ Consulting PartnerEngineering firm providing HLK (HVAC) planning expertise and installation support for SeasON systems. Key implementation partner.
• EKTminorChannel Partner/ Reseller/ DistributorRegional energy partner in Switzerland, shown in partner logos section.
• Antizipa Innovation GmbH / IWBminorStrategic or Co-development PartnerInnovation development partner; Olivier Ferilli serves as Innovationsentwickler representing this partner on the advisory board.

Scale indicators2 records

Recent moves6 records

Expansion highlights5 records

Broad incumbents

• ABB Ltd: Industrial automation and electrification provider with growing exposure to building energy management and district heating. Functions as a broad incumbent for industrial and commercial customers evaluating SeasON's XL solutions.
• Siemens Smart Infrastructure: Broad incumbent offering integrated building HVAC, district heating, and industrial heat solutions. Represents the wider established ecosystem (sales, service, financing) that any pilot-stage thermal storage challenger like SeasON must compete against for enterprise and municipal clients.
• MAN Energy Solutions SE: Industrial-scale producer of CHP, heat pumps, thermal storage, and decarbonisation systems. Represents the incumbent competitive threat for large industrial and district-heating customers that SeasON targets with its XL / custom tier.

Direct peers

• EnergyNest AS: Norwegian thermal energy storage specialist offering Heat-to-Fire, Heat-to-Power, and modular concrete-based TES. Directly comparable to SeasON as both companies sell proprietary long-duration thermal storage to industrial and building customers seeking decoupled charge/discharge and seasonal shifting.
• Polar Night Energy Oy: Finnish long-duration thermal storage company using sand-based high-temperature storage for industrial and district heating customers. Closely comparable on seasonal shifting, proprietary storage technology, and European industrial customer focus.
• Sunamp Ltd: UK-based thermal battery company using phase-change materials for residential hot water and space heat storage. Comparable customer pain points (high supply-temperature renovations, electricity cost reduction) to SeasON's residential S/M/L tiers.
• Brenmiller Energy Ltd: Israel-based publicly listed thermal energy storage company providing bGen-based storage for industrial process heat and combined heat & power. Comparable technology category (industrial/grid-scale TES) with similar customer profile in manufacturing and CHP, but using crushed-rock thermocline storage rather than sorption.
• Kraftblock GmbH: German startup storing thermal energy in recycled steel slag modules for industrial and district heating customers. Direct comparability on proprietary modular TES, industrial focus, and European DACH-centred deployment.

Emerging players

• Calorie GmbH (formerly Smart Thermheat): German startup developing sorption-based thermal storage and heat transformation for industrial and district customers. Closest technology analog (sorption/absorption chemistry) to SeasON, with similar industrial decarbonisation use cases.
• Stiesdal A/S / GridScale: Danish energy storage venture developing thermal, hydrogen, and grid-scale storage including seasonal storage concepts. Comparable broad long-duration storage thesis and overlap with district heating and renewable integration customers.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

Revenue estimate

Valuation estimate

Number of profiles

Profiles12 records

Funding overview

Funding rounds1 record

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about SeasON Energy