Mainzer Stadtwerke AG

About Mainzer Stadtwerke

Mainzer Stadtwerke AG is a municipal enterprise of the City of Mainz and provides public services in the areas of electricity, gas and drinking water supply, district and local heating, public transport, broadband/telecommunications, energy services and port operations. The group comprises around 50 subsidiaries and affiliated companies, including Mainzer Netze GmbH (operation of the electricity, gas and water networks), Mainzer Verkehrsgesellschaft (public transport under the Mainzer Mobilität brand with around 56 million passengers per year), Mainzer Fernwärme GmbH and Mainzer Hafen GmbH. District heating supply is provided primarily by combined heat and power at the Ingelheimer Aue site; a 95-kilometer heating network supplies around 2,500 customers, including state authorities, the university, university hospitals and 1. FSV Mainz 05. In renewable energies, the group holds interests in more than 80 wind turbines and over 200 photovoltaic systems, which generate more than 370 million kWh of electricity annually, complemented by 12 hydropower plants. The sole shareholder is the City of Mainz; the annual surplus most recently amounted to around 18.3 million euros.

Site

Mainz

Processes

Electricity supply, Gas supply, Drinking water supply, District and local heating supply, Generation of renewable energies (wind, PV, hydropower), Public transport (bus and tram, Mainzer Mobilität), Grid operation electricity/gas/water (Mainzer Netze), Broadband/telecommunications services (Mainzer Breitband GmbH)

Industries

Energy supply, Public transport, Drinking water supply, Telecommunications, Port logistics, Waste recycling/Thermal waste treatment

1. 01

   Energy generation (combined heat and power, renewable energies)

2. 02

   Grid operation electricity/gas/water

3. 03

   Distribution and sales

4. 04

   Services (public transport, broadband, contracting, port)

Locations

Services and Facilities

Inside the production

History

1. 1960

   Foundation of Mainzer Fernwärme GmbH (until the end of 2016 Heizkraftwerk GmbH Mainz)

2. 2013

   Electric boiler (power-to-heat, 20 MW) commissioned in the balancing energy market

3. 2014

   Foundation of Thermago GmbH (since 2016 Mainzer Wärme GmbH); supply of the Berlin settlement by Mainzer Wärme plus GmbH from 01.10.2014

4. 2015

   Pionext GmbH founded together with EWR AG and Pfalzwerke AG (2019)

5. 2016

   Introduction of the umbrella brand 'Mainzer'; re-entry into electricity and gas sales (Mainzer Stadtwerke Energie und Service GmbH); Mainzer Fernwärme plus supplies the Lerchenberg district from 01.05.2016; takeover of Mainz broadband activities

6. 2018

   Takeover of the Taubertsbergbad by Mainzer Stadtbad GmbH

7. 2020

   Council decides on tram expansion; first M-Wimmelbuch published

8. 2026

   Annual surplus rose to around 18.3 million euros; opening of the renovated sports and family pool (Taubertsbergbad) in October