Mainzer Stadtwerke

What Mainzer Stadtwerke does

Mainzer Stadtwerke AG is the municipal multi-utility of Mainz, Germany, wholly owned by the City of Mainz (Stadt Mainz) and operating as an Aktiengesellschaft under German law. Founded in 1933 by consolidating the city's electricity, gas, water, and transport operations, the group today runs ~50 subsidiaries and roughly 1,900 employees across an integrated portfolio: electricity and gas retail (Mainzer Energie and Überlandwerk Groß-Gerau), electricity/gas/water grid operations (Mainzer Netze, serving ~550,000 electricity customers, 39,800 gas connections, and ~272,000 water customers), district heating (Mainzer Fernwärme, ~30 km network, ~3,500 customers), public transport by bus and tram (Mainzer Mobilität, 56.8 million passengers in 2024), broadband fiber and public WiFi (Mainzer Breitband/M-Hotspot), and a swimming/spa facility (Taubertsberg Bad). Beyond these core utilities, the group holds a one-third stake in PIONEXT GmbH to operate open-space solar parks and operates the Energiepark Mainz green-hydrogen facility in partnership with Linde GmbH, with a modernized Energypark Mainz 2.0 scheduled for 2027.

The underlying technology footprint combines regulated network infrastructure — 24/7 Netzleitstelle (network control center), new substations such as Umspannwerk Mainspitze, riverbank filtration wells at waterworks Eich, ~26,500 street-lighting points, and the Zollhafen/Heiligkreuz-Viertel urban-development projects — with renewable generation assets totaling ~331 installations (191 PV, 79 wind, 12 hydropower and others via subsidiary KMW AG), producing ~594 million kWh of renewable electricity in 2024. The Energiepark Mainz produces green hydrogen via electrolysis powered by wind energy, a pioneering installation dating to 2015. Real-time customer service operates Monday-Thursday 08:00-17:00 and Friday 08:00-15:00 from headquarters at Rheinallee 41, supplemented by a digital portal and integration with the RMV (Rhein-Main-Verkehrsverbund) tariff system including the Germany-wide Deutschland-Ticket.

The revenue model is a hybrid of regulated network fees and competitive retail tariffs: subscription/recurring revenue from electricity, gas, water, district heating, and broadband supply to residential and commercial customers; transaction/fee revenue from public-transport fares (~56.8M passengers in 2024), swimming-pool admissions, and Zollhafen real estate transactions; infrastructure-development fees via the Heiligkreuz-Viertel project (~2,000 apartments for ~6,000 residents). FY2024 produced an annual surplus (Jahresüberschuss) of €17.2 million, generated after absorbing €27.8 million in public-transport loss compensation and €15.1 million in concession fees to the City of Mainz, with an equity ratio of 42.8%. The go-to-market motion is sales-led and direct, leveraging the customer-service center, an in-person energy sales force for commercial/industrial accounts through Mainzer Stadtwerke Energie und Service GmbH, the Mainzer Mobilität transit channels (mobile app, ticket shops, RMV integration), and Mainzer Netze grid-connection services for industrial customers including a recently signed 90 MW data-center connection order.

Name

Mainzer Stadtwerke

Legal name

Mainzer Stadtwerke AG

Website

https://mainzer-stadtwerke.de

Company type

Private

Founded year

1933

Operating status

Operating

Headcount range

1,001–5,000 employees

Short description

Mainzer Stadtwerke AG is a Mainz-based municipal multi-utility wholly owned by the City of Mainz, delivering electricity, gas, water, district heating, broadband, and bus/tram public transport to roughly 550,000 electricity customers, 272,000 water customers, and 56.8 million annual transit passengers across the region.

Ownership category

akta.pro rank

Product category

Municipal Utilities

NAICS

Utilities (221), Water Supply and Irrigation Systems (221310), Water, Sewage and Other Systems (2213)

SIC

Water Supply (4941), Electric, Gas & Sanitary Services (4900)

akta.pro primary industry

Water Park Operations & Management Services (Third-Party Operators) (THAAABAI)

akta.pro secondary industries

Water, Air Quality & Environmental Hygiene (Legionella/IAQ) (BPABAAAO), Monitoring & Control (Dosing Systems, Remote Monitoring, Sensors) (BPABAJAK), HVAC, Water Heaters & Indoor Air Quality Distribution (CRAOAFAJ)

Keywords

• Municipal utility services
• Energy and water supply
• Public transportation services
• District heating supply
• Renewable energy operations

Headquarters

HQ city

Mainz

HQ country

Germany

HQ region

Europe

Offices3 records

Markets served

GTM type

B2B and B2C

Offering type

Services

Cost components

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

Revenue model

1. Electricity Supply: Sale of electricity including green/eco electricity products to residential and commercial customers in Mainz and surrounding region. Revenue from grid fees and energy sales.
2. Gas Supply: Natural gas supply services to residential and commercial customers.
3. Drinking Water Supply: Water production, treatment and distribution through Mainzer Netze GmbH. Supply to approximately 272,000 people from waterworks Hof Schönau, Eich and Petersaue.
4. Public Transportation: Bus and tram services through Mainzer Verkehrsgesellschaft mbH (Mainzer Mobilität). Revenue from ticket sales. 56.8 million passengers in 2024. Integrated with RMV tariff system.
5. District Heating: Central heating supply through Mainzer Fernwärme GmbH and Mainzer Wärme Plus GmbH (100% subsidiary of MSES). Approximately 3,500 customers on Lerchenberg and Berliner Siedlung.
6. Broadband/Fiber: Fiber optic network services through Mainzer Breitband GmbH. Public WLAN hotspots (M-Hotspot).
7. Swimming Pool and Wellness: Operation of Taubertsberg Bad sports and family pool plus spa facility through Mainzer Stadtbad GmbH.
8. Infrastructure Development: Real estate development and infrastructure projects including Zollhafen and Heiligkreuz-Viertel urban development through Zollhafen Mainz GmbH & Co. KG and direct subsidiary projects.

Pricing tiers

Go-to-market motion1 record

Distribution channels6 records

Marketing channels11 records

Core offering

Mainzer Stadtwerke AG is a municipal multi-utility holding company providing essential public services across the Mainz and Rhein-Main region, including electricity, natural gas, drinking water, district heating, public transportation (buses and trams), broadband/fiber networks, public WiFi, renewable energy, and swimming/wellness facilities. The company operates through more than 50 subsidiaries including Mainzer Netze, Mainzer Energie, Mainzer Mobilität, Mainzer Fernwärme, Mainzer Breitband, and Mainzer Erneuerbare Energien, serving approximately 272,000 water customers, 23,500 energy customers, and 56.8 million public transport passengers annually.

Product overview

Mainzer Stadtwerke AG is a municipal utility company operating as a multi-utility provider and holding company with over 50 subsidiaries. The organization offers a diversified portfolio of services organized around core business segments: energy supply (electricity, gas, heating via Mainzer Energie and subsidiary Wärme Plus), water supply and grid infrastructure (Mainzer Netze), public transportation (Mainzer Mobilität), district heating (Mainzer Fernwärme), broadband/fiber (Mainzer Breitband), and renewable energy development (Mainzer Erneuerbare Energien). Additional operations include swimming facilities (Taubertsberg Bad), urban development projects (Heiligkreuz-Viertel, Zollhafen), hydrogen production (Energiepark Mainz), and sustainability programs. The company provides 24/7 utility services to Mainz and the region under its corporate purpose 'Da.Sein – Vor.Ort' (Being There – On Site), with approximately 1,900 employees serving roughly 272,000 water customers and operating extensive electricity, gas, and district heating networks.

Differentiator

Problem solved

Functional benefit

Brands

• Mainzer Energie: Energy supply brand for electricity, gas, and cooling solutions for private and commercial customers
• Mainzer Mobilität
• Mainzer Netze
• Mainzer Fernwärme
• Mainzer Breitband
• Mainzer Taubertsbergbad
• Mainzer Erneuerbare Energien
• M wie Zukunft
• Energiepark Mainz
• Aus Grau wird Leben

Products and services

• Electricity Supply (Mainzer Energie)

Quantifiable outcome

• Supplied approximately 272,000 people with drinking water
• +5 more outcomes

Named customers4 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

Integration13 records

Feature5 records

Partnerships

Seven partnerships are on record, tiered core, major and minor.

• Linde GmbHcoreStrategic or Co-development Partner · 7 August 2025Partnership with Linde for hydrogen production at Energypark Mainz since 2015. Extended collaboration for 15 more years with Energypark Mainz 2.0 project featuring modern electrolyzers (5 MW total), 300 bar filling station, and industrial hydrogen supply. Linde provides process gas to industrial customers while Mainzer Stadtwerke supplies green electricity for electrolysis.
• PIONEXT GmbHcoreStrategic or Co-development PartnerMainzer Erneuerbare Energien GmbH holds one-third stake in PIONEXT GmbH which operates renewable energy installations. First open-space photovoltaic park in Lipporn (Rhein-Lahn-Kreis) with 10.7 MWp capacity. Next solar park in Lonsheim (25 hectares, 56,000+ modules) going online summer 2025.
• CA ImmomajorStrategic or Co-development PartnerJoint development of Zollhafen Mainz project on 30-hectare area combining residential, cultural, and commercial spaces with restored industrial monuments, canals, and marina. Project advancing with Grünufers Nord (10,000 sqm park) and continued development.
• Deutsche Telekom GmbHminorImplementation/ SI/ Consulting PartnerService provider for DocuSign digital signature processing with data hosting in three EU data centers (Paris, Amsterdam, Frankfurt).
• Kraftwerke Mainz-Wiesbaden AG (KMW AG)coreStrategic or Co-development Partner50% subsidiary of Mainzer Stadtwerke group contributing to total of 331 renewable energy installations. Part of 594 million kWh renewable electricity production in 2024.
• RMV (Rhein-Main-Verkehrsverbund)majorStrategic or Co-development PartnerRegional transport association integrating Mainz public transport into unified tariff and ticketing system. Provides Deutschland-Ticket and other ticket options. 56.8 million passengers transported in 2024.
• Mainzer Stiftung für Klimaschutz und EnergieeffizienzcoreStrategic or Co-development PartnerFoundation jointly established by Mainzer Stadtwerke AG and City of Mainz supporting climate protection and energy efficiency projects including 'Aus Grau wird Leben' greening program for schoolyards.

Scale indicators16 records

Recent moves7 records

Expansion highlights8 records

Direct peers

• N-ERGIE Aktiengesellschaft: Nürnberg's regional municipal energy company supplying electricity, gas, heat, and water across Middle Franconia. Comparable mid-tier municipal energy company with a similar regional franchise model.
• Stadtwerke München (SWM): Munich's municipal multi-utility (M-Stadtwerke) operating electricity, gas, water, district heating, public transit (MVG), and broadband (M-Net). The most direct structural analog to Mainzer Stadtwerke as a vertically integrated municipal Versorger with similar Daseinsvorsorge mandate and multi-utility scope.
• Stadtwerke Düsseldorf AG: Düsseldorf's municipal utility operating electricity, gas, water, heat, and public transit. Direct German Stadtwerke peer with comparable mid-city scale and multi-utility profile.
• Mainova AG: Frankfurt-based municipal multi-utility (electricity, gas, water, heat, energy services), part of the same Rhein-Main regulatory geography. Closest regional peer in terms of customer mix, network operations, and multi-utility footprint overlapping Mainzer Stadtwerke's territory.
• Stadtwerke Köln GmbH: Cologne's municipal multi-utility operating electricity, gas, water, district heating, public transit (KVB), and broadband. Comparable mid-tier German Stadtwerke with a similar multi-utility structure and Rhine-region footprint.
• Leipziger Stadtwerke: Leipzig's municipal multi-utility providing electricity, gas, heat, water, and public transit in eastern Germany. Direct peer as a mid-size German Stadtwerke with similar vertically integrated structure.
• enercity (Stadtwerke Hannover AG): Hannover's municipal multi-utility providing electricity, gas, heat, water, and e-mobility to a comparable mid-size German city. Direct Stadtwerke peer with similar scope and renewable energy strategy.

Broad incumbents

• EnBW Energie Baden-Württemberg AG: One of Germany's four major integrated utilities, providing electricity, gas, water, and network services. Acts as a broad incumbent competitor and counterparty rather than a direct multi-utility peer, but is the relevant scale benchmark for grid, generation, and energy services competition in Germany.

Others

• Thüga Aktiengesellschaft: Munich-based holding/consortium of more than 100 German municipal utilities, providing shared services, procurement, and digital solutions to Stadtwerke. Closely related ecosystem participant — comparable to Mainzer Stadtwerke as a peer network rather than a direct competitor.

Regional players

• EWR AG (Energieversorgung Worms, Rheinhessen): Worms-based regional municipal utility operating in the Rheinhessen region, adjacent to Mainz's territory. Comparable regional Versorger with overlapping franchise geography and similar municipal-ownership structure.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• YouTubeyoutube.com/user/stadtwerkemainz
• Facebookfacebook.com/mainzerstadtwerke
• LinkedInlinkedin.com/company/mainzer-stadtwerke-ag
• Instagraminstagram.com/mainzer_stadtwerke
• TikToktiktok.com/@mainzer.stadtwerke

Compliance3 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles3 records

Subsidiaries13 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 Mainzer Stadtwerke