Stadtwerke Sigmaringen GmbH

What Stadtwerke Sigmaringen GmbH does

Stadtwerke Sigmaringen GmbH is a municipal multi-utility (Stadtwerk) wholly owned by the City of Sigmaringen, operating from its headquarters at Marie-Curie-Straße 8 in Sigmaringen, Baden-Württemberg, Germany. The company supplies electricity, natural gas, drinking water, and district heating to approximately 20,000 customers in Sigmaringen and surrounding communities including Laiz, Jungnau, Oberschmeien, Unterschmeien, and the municipality of Inzigkofen. Its infrastructure footprint spans 220 km of low-voltage and 95 km of medium-voltage electricity cables, roughly 148 km of gas distribution network, a 120 km water pipe network, and a centralized district heating system. The company also operates public infrastructure including the Donaubad (outdoor pool), Hallenbad (indoor pool), Donaubus city bus service (with Rufbus on-demand), and the Parkhaus Prinzengarten with 213 parking spaces.

The business is anchored on regulated network operations (electricity, gas, water) under §4 EnWG, complemented by retail energy supply under the SIG strom natur / SIG strom classic and SIG erdgas classic product lines, and the Nahwärme (district heating) offering delivered via a subsidiary Nahwärmegesellschaft Region Sigmaringen (NRS). Renewable energy generation includes two hydroelectric plants on the Danube (Sigmaringen commissioned 1996, Laiz 1999), a 740 kW biogas combined heat and power unit at the Kreiskrankenhaus Sigmaringen, two wind turbine subsidiaries (WKA Sigmaringen and WKA Laiz), and over-regional equity stakes in wind and large-scale PV companies; the medium-term internal target is 29 million kWh of self-generated renewable electricity annually.

Revenue is generated through subscription-based utility charges (electricity, gas, water, heat network usage fees), unit-based pricing for the parking garage and pool entrances, and fare-based revenue from the Donaubus service. Distribution is multi-channel: a physical customer center, online customer portal, WhatsApp service channels, social media (Facebook, Instagram, Mastodon), field sales via technical service teams for B2B and new connections, and dedicated account management for business customers (Geschäftskund*innen). The customer base is dominated by private residential households with a secondary segment of regional commercial and industrial clients, and the company also serves municipal facilities including schools and the district hospital.

Name

Stadtwerke Sigmaringen GmbH

Legal name

Stadtwerke Sigmaringen GmbH

Website

https://stadtwerke-sigmaringen.de

Company type

Private

Founded year

1862

Operating status

Operating

Headcount range

11–50 employees

Short description

Stadtwerke Sigmaringen GmbH is a municipally-owned multi-utility providing electricity, natural gas, water, and district heating — plus bus, swimming pool, and parking services — to approximately 20,000 customers in Sigmaringen, Baden-Württemberg, Germany.

Ownership category

akta.pro rank

Product category

Municipal Multi-Utility Services

NAICS

Electric Power Generation, Transmission and Distribution (2211), Water Supply and Irrigation Systems (221310), Hydroelectric Power Generation (221111), Solar Electric Power Generation (221114)

SIC

Electric, Gas & Sanitary Services (4900), Water Supply (4941), Cogeneration Services & Small Power Producers (4991)

akta.pro primary industry

Public Works & Municipal Infrastructure (Streets, Stormwater, Facilities) (BPAIACAF)

akta.pro secondary industries

Interconnection, Permitting & Grid Services for DERs (EUAMAJAH), Distributed Storage (Behind-the-Meter Batteries) (EUAMAJAE)

Keywords

• Municipal utility services
• Electricity distribution
• Natural gas supply
• Drinking water supply
• District heating

Headquarters

HQ city

Sigmaringen

HQ country

Germany

HQ region

Europe

Offices3 records

Markets served

GTM type

B2C

Offering type

Services

Cost components

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

Revenue model

1. Electricity Supply: Supply of electricity (Strom) to residential and business customers under SIG strom natur and SIG strom classic product lines. Revenue from electricity consumption charges and network usage fees.
2. Natural Gas Supply: Supply of natural gas (Erdgas) to residential and business customers under SIG erdgas classic product. Includes CNG filling station operation (now outsourced to OG clean fuels).
3. Water Supply: Drinking water supply to approximately 17,000 people from own water sources via 120 km pipe network. Revenue from water consumption charges.
4. District Heating: Supply of heat (Nahwärme) to residential and business customers through centralized heating network. Revenue from heat consumption based on heat meter readings.
5. Network Operations: Operation of electricity, gas, and water distribution networks as regulated network operator. Revenue from network usage charges regulated by law.
6. Municipal Infrastructure Services: Operation of Donaubad (outdoor swimming pool), Hallenbad (indoor pool), parking garage, and Donaubus public transport. Revenue from entrance fees, parking fees, and transport fares.

Pricing tiers

Go-to-market motion2 records

Distribution channels5 records

Marketing channels9 records

Core offering

Stadtwerke Sigmaringen GmbH is a municipal multi-utility that supplies electricity, natural gas, drinking water, and district heating to residential and business customers in the Sigmaringen region. The company also operates public municipal infrastructure including the Donaubad outdoor swimming pool, Donaubus local city bus service, and Parkhaus Prinzengarten parking facility, and offers related services such as solar installations (solardach+), e-mobility charging, and energy consulting.

Product overview

Stadtwerke Sigmaringen GmbH is a multi-utility provider offering a diversified portfolio of energy and infrastructure services. The core offerings include electricity (SIG strom natur, SIG strom classic), natural gas (SIG erdgas classic), drinking water supply, and district heating (Nahwärme). These are complemented by renewable energy products like solardach+ (solar PV with storage), e-mobility charging infrastructure, and grid services. The company also operates public facilities including Donaubad (outdoor swimming pool), city bus (Donaubus), and parking garage (Parkhaus Prinzengarten). Customer-facing digital services include an online customer portal and grid connection portal. The products span a platform-plus-service model, where physical infrastructure networks (electricity, gas, water, heating) form the foundation, supplemented by value-added services and digital tools for customer self-service and energy management.

Differentiator

Problem solved

Functional benefit

Brands

• solardach+: Solar power product offering for private customers, enabling solar panel installation and energy self-generation.
• SIG strom natur
• SIG erdgas classic

Products and services

• SIG strom classic (Electricity Supply) Standard residential electricity supply product available in single-rate (Eintarifzähler) and dual-rate (Zweitarifzähler) meter configurations, with pricing effective from 1 January 2026.
• SIG strom natur (Regional Electricity) Regional electricity tariff for private customers with a reliable price guarantee and emphasis on local value creation.
• SIG erdgas classic (Natural Gas Supply) Natural gas supply product for residential customers with pricing effective from 1 January 2026.
• Wasserversorgung (Drinking Water Supply) Drinking water supply from own sources, serving approximately 17,000 people through a 120-kilometer pipe network with annual output of approximately 1 million cubic meters.
• Nahwärme (District Heating) Centralized heating solution where water is heated using regenerative energy sources and distributed via insulated pipes to nearby customers for heating and hot water.
• solardach+ (Solar Package) Complete solar roof solution enabling residential customers to generate their own electricity from solar panels, with optional battery storage systems for storing excess energy for later use.
• E-Mobilität (E-Mobility Charging and Wallbox) Electric mobility services including public charging stations for cars and E-bikes, and private Wallbox solutions for residential customers.
• Donaubad Sigmaringen (Outdoor Swimming Pool) Outdoor swimming facility (rebranded from 'Freibad Sigmaringen' in 2023) featuring 5-meter diving tower, wide slide, massage jets, and accessible facilities.
• Donaubus (City Bus Service) City bus service in Sigmaringen and Laiz, operating multiple lines including route buses and on-demand services (Rufbus).
• Parkhaus Prinzengarten (Parking Garage) Multi-story parking garage with 213 parking spaces located in Sigmaringen, with daily parking from 3 EUR.
• Stromnetz (Electricity Distribution Network) Regulated electricity distribution network covering Sigmaringen and districts Laiz, Jungnau, Oberschmeien, and Unterschmeien, serving 11,677 extraction points with 220 km of low-voltage cable and 95 km of medium-voltage cable.
• Gasnetz (Natural Gas Distribution Network) Regulated natural gas distribution network covering Sigmaringen, Laiz, and the municipality of Inzigkofen, with 3,362 extraction points and 98 km of low-pressure gas network plus 50 km of house connection lines.
• Erdgastankstelle (CNG Refueling Station) Compressed natural gas (CNG) refueling station at Friedrich-List-Straße; operation transferred to OG clean fuels on 1 May 2025 while Stadtwerke retains ownership.
• Netzanschlussportal (Grid Connection Portal) Online portal for grid connection applications, including forms for PV systems, storage systems, and measurement concepts, serving installers and customers.

Quantifiable outcome

• Serve more than 20,000 customers
• +3 more outcomes

Named customers3 records

Segments4 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration1 record

Feature4 records

Partnerships

Six partnerships are on record, tiered minor and core.

• OG clean fuelsminorOthers · 1 May 2025OG clean fuels took over operation of the CNG filling station at Friedrich-List-Straße from Stadtwerke Sigmaringen on 01.05.2025. Stadtwerke remains the owner while OG clean fuels operates the station. Contact: Jessica John ([email protected]).
• Nahwärmegesellschaft Region Sigmaringen (NRS)coreStrategic or Co-development PartnerRegional district heating company for district heating network expansion and operation in the Sigmaringen region. Collaborates on district heating projects including Riedbaum and Jungnau areas.
• CaritasminorOthersSocial welfare partnership for the Sozialfonds (social fund) providing energy assistance to customers in need. Jointly funded initiative with regular progress reports.
• Hochschule (University)minorStrategic or Co-development PartnerCooperation with university on Donaubus public transport research and optimization.
• Bodenseewasserversorgung (Lake Constance Water Supply)coreStrategic or Co-development PartnerWater treatment facility at Wittberg with connection to Bodenseewasserversorgung for backup water supply. Part of diversified water sourcing strategy.
• Erdgas Südwest GmbHcoreTechnology or IntegrationNatural gas supplier to Stadtwerke Sigmaringen. Provides natural gas with specified Wobbe index, calorific value, and quality parameters.

Scale indicators23 records

Recent moves9 records

Expansion highlights6 records

Direct peers

• Stadtwerke Tübingen GmbH: Universitätsstadt municipal utility offering electricity (including swt Naturstrom from regional renewables), gas, water, district heating, and a Stadtbus service. Highly comparable multi-utility with strong renewable and regional-product positioning in Baden-Württemberg.
• Stadtwerke Konstanz GmbH: Municipal multi-utility serving Konstanz on Lake Constance with electricity, gas, water, district heating, bus services and a lakeside swimming facility. Highly comparable as a Baden-Württemberg Stadtwerke of similar geographic and operational profile, including waterfront leisure assets and renewable generation.
• Technische Werke Friedrichshafen GmbH: Municipal utility for Friedrichshafen providing electricity, gas, water, district heating and telecommunications (TWF fiber). Comparable as a regional Baden-Württemberg multi-utility combining regulated energy networks with municipal services and infrastructure investments.
• Stadtwerke Tuttlingen GmbH: Municipal utility serving the Tuttlingen district with electricity, gas, water and district heating, including renewable generation. Closely comparable mid-sized Stadtwerke in southern Baden-Württemberg with similar customer scale and product breadth.
• Stadtwerke Balingen GmbH: Municipal utility in the Zollernalbkreis region supplying electricity, gas, water and heat to roughly 35,000 residents. Same regional size tier and multi-utility scope as Stadtwerke Sigmaringen, including renewable generation assets.
• Stadtwerke Villingen-Schwenningen GmbH: Dual-city municipal utility supplying electricity, gas, water and heat, plus local public transport (Schwarzwald-Baar Bus) and Bäder (swimming facilities). Mirrors Stadtwerke Sigmaringen's combined energy-plus-mobility-plus-baths operating model in the same region.
• Stadtwerke Ravensburg GmbH: Municipal utility providing electricity, gas, water, district heating and a Technische Werke subsidiary for telecommunications in the Oberschwaben region. Comparable upper-Swabia multi-utility operator with similar customer scale and renewable energy focus.

Broad incumbents

• Netze BW GmbH: Largest distribution system operator in Baden-Württemberg and EnBW subsidiary, operating electricity, gas and water networks across the state. Serves as the upstream grid counterpart to Stadtwerke Sigmaringen and is the broad-incumbent benchmark for regulated network operations in the region.
• EnBW Oberschwaben-Allgäu GmbH & Co. KG: Regional EnBW subsidiary supplying electricity and grid services across the Oberschwaben-Allgäu territory. Comparable as a regional utility serving the same southern Baden-Württemberg geography, though at significantly larger scale and as part of the EnBW group.

Others

• Bodenseewasserversorgung: Inter-municipal water supply utility providing drinking water from Lake Constance to municipalities across Baden-Württemberg, including Stadtwerke Sigmaringen via the Wittberg treatment plant. Directly relevant as the partner supplying backup water to the company's distribution network.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key highlights6 records

Customer concentration

• Xx.com/mastodon
• YouTubeinstagram.com/stadtwerke_sigmaringen
• Facebookfacebook.com/stadtwerkesigmaringen
• Instagraminstagram.com/stadtwerke_sigmaringen
• LinkedInlinkedin.com/company/stadtwerke-sigmaringen

Revenue estimate

Valuation estimate

Number of profiles

Profiles8 records

Subsidiaries3 records

Funding overview

Funding rounds

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 Stadtwerke Sigmaringen GmbH