S.O.L.I.D. Gesellschaft für Solarinstallation und Design

What S.O.L.I.D. Gesellschaft für Solarinstallation und Design does

S.O.L.I.D. Gesellschaft für Solarinstallation und Design (trading as SOLID Solar Energy Systems) is an Austrian solar engineering company headquartered in Graz, founded in 1992, that designs, builds, and operates large-scale solar thermal systems for heating, cooling, and electricity generation. The company serves municipalities and utilities (district heating decarbonization), industrial and commercial enterprises (process heat and absorption cooling), and educational institutions, with more than 300 systems realized across 40+ countries including Austria, Germany, the USA, Singapore, Portugal, the UAE, Jamaica, Aruba, Kosovo, Slovenia, Serbia, and Nicaragua. Wholly-owned subsidiaries — Solar Thermal Construction Inc. in San Diego and SOLID Solar Energy Systems Asia Pacific Pte. Ltd. in Singapore — support North American and Asia-Pacific execution.

Its product portfolio spans eight offerings: Solar District Heating, Solar Process Heat, Solar Cooling (lithium-bromide absorption chillers), Solar Hot Water & Heating, Heat Pumps (developed in-house since 2002), large-scale Photovoltaic (the most recent addition), the BigSolar seasonal heat-storage concept (storage volumes from 60 m³ to 99,000 m³ enabling up to 50% solar share in district heating), and Consulting services. Core proprietary technology centers on high-temperature flat plate collectors in 9–12 m² panel sizes optimized for large-scale installation and international shipping, integrated with seasonal thermal buffer storage and absorption cooling for solar-driven chillers.

The business model combines project-based EPC revenue (won through competitive tenders issued by municipalities, utilities, and large corporations) with recurring ESCo heat-supply contracts in which customers pay for delivered heat or cooling rather than purchasing the asset. Notable customers include Energie Graz, Ball Corporation (3,956 m² process heat plant in California, displacing over 200,000 therms of natural gas annually), PepsiCo Gatorade, IKEA Singapore, United World College Singapore, Harvard University, Caixa Geral de Depósitos (Lisbon), Fleischwaren Berger, Franziskus Hospital Harderberg, Digicel Jamaica, and Hyatt Regency Aruba. The company is privately held, led by CEO Stephan Jantscher, with Christian Holter on the board of the North American entity, and has been recognized with the 2018 Energy Globe Styria Award and Austrian Solar Prize for the HELIOS project.

Name

S.O.L.I.D. Gesellschaft für Solarinstallation und Design

Legal name

SOLID Solar Energy Systems GmbH

Website

https://solid.at

Company type

Private

Founded year

1992

Operating status

Operating

Headcount range

11–50 employees

Short description

S.O.L.I.D. is an Austrian solar engineering firm founded in 1992 that designs, builds, and operates large-scale solar thermal systems for district heating, industrial process heat, and absorption cooling, serving municipalities, utilities, and industrial clients across 40+ countries via project EPC contracts and ESCo energy service arrangements.

Ownership category

akta.pro rank

Product category

Solar Thermal Engineering & Renewable Energy Infrastructure

NAICS

Heating Equipment (except Warm Air Furnaces) Manufacturing (333414), Power Boiler and Heat Exchanger Manufacturing (332410)

SIC

Air-Cond & Warm Air Heatg Equip & Comm & Indl Refrig Equip (3585), Heating Equipment, Except Electric & Warm Air Furnaces (3433)

akta.pro primary industry

Solar Balance-of-Plant EPC (Piles/Foundations, Trenching, Combiner Networks) (EUAEADAJ)

akta.pro secondary industries

Chillers & Cooling Plant Equipment (IMAHAKAE), Heat Transfer Equipment (Heat Exchangers, Boilers, Condensers) (IMAHAEAC), Molten Salt Thermal Storage (CSP & High-Temperature Heat) (EUAFANAB)

Keywords

• Solar thermal systems
• Solar district heating
• Solar process heat
• Absorption cooling technology
• Seasonal heat storage

Headquarters

HQ city

Graz

HQ country

Austria

HQ region

Europe

Offices3 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Solar thermal system design and construction: SOLID designs and builds custom solar thermal systems for municipalities, utilities, and industrial clients. Revenue is generated through project-based system construction contracts, typically won through competitive tender processes.
2. Heat supply contracts (ESCo): SOLID operates systems under Energy Service Company (ESCo) arrangements, providing heat and cooling energy to clients at competitive rates. Clients pay for delivered energy services rather than capital investment.
3. Photovoltaic system installation: Design and installation of large-scale photovoltaic systems in the megawatt range, as the latest addition to the product portfolio
4. Consulting services: Tailor-made consultancy services for project development, know-how building, financing, market development, and feasibility studies

Pricing tiers

Go-to-market motion1 record

Distribution channels3 records

Marketing channels7 records

Core offering

SOLID is an Austrian solar engineering company that designs, builds, and operates large-scale solar thermal, absorption cooling, and photovoltaic systems for district heating, industrial process heat, cooling, and electricity generation. It delivers end-to-end project execution plus Energy Service Company (ESCo) heat supply contracts, and complements these with project development consulting and feasibility studies.

Product overview

SOLID Solar Energy Systems offers a comprehensive portfolio of solar thermal and photovoltaic solutions for heating, cooling, and electricity generation. The product lineup consists of eight distinct offerings: Solar District Heating and BigSolar for large-scale district heating applications with seasonal storage; Solar Process Heat for industrial decarbonization; Solar Cooling using absorption technology; Solar Hot Water & Heating for residential and commercial buildings; Heat Pump systems; and Photovoltaic for large-scale electricity generation. Additionally, Consulting services provide project development and feasibility study support. The products are designed to work independently or in integrated combinations, with solutions spanning from small-scale hot water systems to multi-megawatt industrial installations across commercial, industrial, and municipal segments worldwide.

Differentiator

Problem solved

Functional benefit

Brands

• BigSolar: Seasonal heat storage technology enabling up to 50% solar share at lowest energy prices for grid-connected district heating infrastructure
• Energy Cabin SOLID

Products and services

• Solar District Heating Solar thermal systems that increase renewable heat supply and energy efficiency in district heating networks, enabling biomass and fossil-fuel boilers to be shut down during summer months for municipalities and utility operators.
• Solar Process Heat Industrial-scale solar thermal solutions that decarbonize manufacturing processes by delivering renewable process heat with optimal techno-economic results for industrial and commercial facilities.
• Solar Cooling Absorption cooling technology systems using Lithium-Bromide chillers driven by solar thermal energy to reduce power consumption and peak electrical loads for cooling applications in commercial and institutional buildings.
• Solar Hot Water & Heating Solar hot water and heating systems with load management and thermal storage capability, featuring simple integration, high space efficiency, and flexibility for residential and commercial buildings.
• Heat Pump

Quantifiable outcome

• Ball Corporation project saves over 200,000 therms natural gas per year
• +5 more outcomes

Named customers15 records

Segments3 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Partnerships

Ten partnerships are on record, tiered core and minor.

• CaverioncoreImplementation/ SI/ Consulting Partner · 1 January 2022Implementation partner for the HELIOS project with Energie Graz. SOLID won the tender together with Caverion for the 2nd and 3rd construction phase, expanding the collector area from 2,000 m² to 6,000 m².
• TIGIcoreStrategic or Co-development PartnerIsraeli company partnering with SOLID for the Ball Corporation project in California. Solar heat is provided under a heat supply contract through this partnership.
• Energie GrazcoreStrategic or Co-development PartnerEnergy supplier for the Styrian capital Graz; partner in multiple district heating projects including HELIOS. Energie Graz reliably secures the heat supply of Graz and operates alternative energy supply projects.
• Bundesimmobiliengesellschaft (BIG)coreChannel Partner/ Reseller/ DistributorFederal real estate company (BIG) issues tenders for sustainable energy systems in Austrian federal buildings. SOLID was selected as best bidder for BRG Ramsauerstraße and HTL Kapfenberg PV projects.
• Stadtwerke RadolfzellminorStrategic or Co-development PartnerGerman utility company interested in solar thermal for heat generation portfolio. Liggeringen was their first solar thermal plant to gain experience with the technology.
• Energetika VranskominorChannel Partner/ Reseller/ DistributorLocal utility in Slovenia that wanted to increase green energy supply to district heating system. Installed first solar district heating system in Slovenia.
• United World College of South East AsiacoreStrategic or Co-development PartnerUWC-SEA signed a contract with SOLID on energy services delivery for cooling and heat. Project was developed as ESCo arrangement at the East Campus in Singapore.
• Energia de PortugalminorImplementation/ SI/ Consulting PartnerEnergy company charged by Caixa Geral de Depósitos to develop the solar thermal solution for the bank headquarters in Lisbon together with SOLID.
• Energie SteiermarkminorStrategic or Co-development PartnerLocal energy utility involved in the pre-feasibility study for BigSolar Feldbach project, analyzing BigSolar integration for decarbonization.
• SOLID America Energy ServicescoreStrategic or Co-development PartnerSubsidiary (mentioned as SOLID America Energy Services llc) involved in North American projects including the Ball Corporation project and future decarbonization plans.

Scale indicators3 records

Recent moves6 records

Expansion highlights6 records

Broad incumbents

• Viessmann: Global incumbent in heating, industrial and refrigeration systems including solar thermal, heat pumps, and commercial HVAC - competes with SOLID on integrated decarbonization packages for municipalities and large enterprises.
• ENGIE: Multinational energy services and district heating utility with decarbonization offerings spanning heating networks, heat pumps, and renewable heat - competes with SOLID at the utility-scale ESCo and district decarbonization level.

Direct peers

• Savo Solar: Finnish large-scale solar thermal EPC and project developer active across Europe with district heating and industrial applications, competing head-to-head with SOLID for municipal and industrial solar thermal tenders.
• SunDrum Solar: Danish large-scale solar thermal EPC delivering seasonal storage plant solutions for European district heating networks, directly comparable to SOLID's BigSolar and seasonal buffer storage approach.
• GREENoneTEC: Austrian solar thermal collector manufacturer in the same region as SOLID, focused on large-scale collectors for district heating and commercial/industrial applications.
• TVP Solar: Swiss vacuum-based high-temperature solar thermal technology provider for industrial process heat and cooling applications, overlapping with SOLID's absorption cooling and process heat solutions.
• Ritter XL Solar: German manufacturer of large-format solar thermal collectors used in industrial and district heating projects across Europe, supplying similar high-temperature collectors as SOLID's proprietary 9-12 m² panels.
• Arcon-Sunmark: Danish custom-designed large-scale solar thermal plant provider for district heating and industry; closest comparable to SOLID's BigSolar seasonal storage and process-heat offerings in Central and Northern Europe.
• Absolicon: Swedish solar thermal concentrator developer focused on industrial process heat and district heating, comparable to SOLID in targeting food/beverage and heavy industry decarbonization.

Emerging players

• GlassPoint Solar: Specialist in solar steam for industrial process heat (notably oil & gas and heavy industry), a comparable use case to SOLID's Ball Corporation and PepsiCo/Gatorade deployments but focused on a different industrial vertical.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights6 records

Customer concentration

• Xx.com/solid_austria
• YouTubeyoutube.com/@solidsolarenergysystems7443
• Facebookfacebook.com/profile.php?id=100078098746773
• LinkedInlinkedin.com/company/solidses

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 records

Subsidiaries2 records

Funding overview

Funding rounds1 record

Investors1 record

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 S.O.L.I.D. Gesellschaft für Solarinstallation und Design