Stadtwerke Neu-Isenburg

What Stadtwerke Neu-Isenburg does

Stadtwerke Neu-Isenburg GmbH is a municipal utility (Stadtwerke) wholly owned by the city of Neu-Isenburg, providing electricity, natural gas, drinking water, and heating services to approximately 41,000 residents across Neu-Isenburg, Zeppelinheim, and Gravenbruch in Germany. The company is the designated Grundversorger (basic supplier) for electricity and gas through 31.12.2027 under §36(2) EnWG, operating the local electricity and gas distribution networks (the gas network spans ~98 km across low/medium/high pressure) and sourcing drinking water from 11 wells in the Isenburg forest for the PURaqua brand via its own waterworks. Beyond core utility supply, the company runs city bus lines OF-51, OF-52, and OF-53, the WaldSchwimmbad recreational facility (acquired 2002, centenary 2026), and the 'Digitale Dorflinde' Smart City WiFi network.

The product portfolio is organized under branded tariff families: isySTROM (electricity, including basis/privat/maxi/öko/regio/bau/Gewerbe/Mieter/flex/smart14a variants), isyERDGAS (gas), PURaqua (water), isyWÄRME (heating-as-a-service with isyWÄRME-Check assessment), isySTROM_mobil (EV charging, wallboxes, charging cards, THG quota), and isySTROM_solar (PV rental). The company has scaled installed photovoltaic capacity to 2,201 kWp across 56 systems, including Mieterstrom tenant-electricity projects delivered with housing partner GEWOBAU (896 kWp, 783,000 kWh/year) and four commercial customers (446 kWp, 387,300 kWh/year), generating over 2 million kWh annually. Operations run on an SAP-based customer portal (onlineservice.swni-online.de) supported by an outsourced chatbot and voicebot from hsag Heidelberger Services AG. IT security is certified under the IT-Sicherheitskatalog gem. §11(1a) EnWG for secure grid operation.

Revenue is generated primarily through regulated retail and network tariff income from electricity, gas, water, and heat supply, plus public-transport operations, swimming-pool admissions (with isyTreue loyalty discount), and emerging PV/EV infrastructure services. Distribution is direct-to-consumer via an online tariff calculator, SAP-based customer portal, physical customer service center at the Schleussnerstraße headquarters, and 24/7 emergency hotlines for gas and for electricity/water/heat. The supervisory board is chaired by First City Councilor Stefan Schmitt, with Kirk Reineke serving as authorized managing director (Geschäftsführer).

Name

Stadtwerke Neu-Isenburg

Legal name

Stadtwerke Neu-Isenburg GmbH

Website

https://swni.de

Company type

Private

Founded year

1901

Operating status

Operating

Headcount range

51–100 employees

Short description

Stadtwerke Neu-Isenburg is a municipal utility wholly owned by the city of Neu-Isenburg, supplying electricity, natural gas, drinking water, and heating to about 41,000 residents in Neu-Isenburg, Zeppelinheim, and Gravenbruch, and operating the local distribution networks, city buses, and the WaldSchwimmbad.

Ownership category

akta.pro rank

Headquarters

HQ city

Neu Isenburg

HQ country

Germany

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B and B2C

Offering type

Services

Cost components

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

Revenue model

1. Electricity Supply: Supply of electricity to residential and commercial customers through various tariff products (isySTROM product family). As the designated basic supply provider (Grundversorger) for Strom until 31.12.2027, the company supplies most household customers in its network area.
2. Natural Gas Supply: Supply of natural gas to residential and commercial customers through various tariff products (isyERDGAS product family). As the designated basic supply provider (Grundversorger) for Gas until 31.12.2027.
3. Water Supply: Potable water supply to approximately 41,000 residents in Neu-Isenburg, Zeppelinheim, and Gravenbruch, sourced from 11 wells in the local forest and processed at the company's waterworks.
4. Network Operations: Operation of electricity and gas distribution networks within the municipal area. The electricity network covers MS/NS transformation and NS (low voltage), while the gas network spans approximately 98 km across pressure levels.
5. Public Transportation (ÖPNV): Operation of city bus lines OF-51, OF-52, and OF-53, and coordination of regional transport services.
6. WaldSchwimmbad Recreation Facility: Operation of the WaldSchwimmbad forest swimming pool (celebrating 100 years in 2026), offering admission tickets and season passes, with 20% discount for isyTreue card holders.
7. Heat Energy Solutions: isyWÄRME heating solutions including heating system rentals and the isyWÄRME-Check assessment service for energy-efficient heating concepts.
8. Photovoltaic Systems: Installation and rental of solar PV systems including rooftop installations, balcony power plants (Balkonkraftwerke), and larger Mieterstrom (tenant electricity) projects on apartment buildings.
9. E-Mobility Infrastructure: Public EV charging stations, isySTROM_mobil charging cards, wallbox sales and installation for home charging.

Go-to-market motion1 record

Distribution channels5 records

Marketing channels6 records

Core offering

Stadtwerke Neu-Isenburg is a municipal utility that supplies electricity (isySTROM tariff family), natural gas (isyERDGAS), and drinking water (PURaqua) to approximately 41,000 residents in Neu-Isenburg, Zeppelinheim, and Gravenbruch under a Grundversorger mandate through end of 2027. Beyond commodity supply, the company delivers heating solutions (isyWÄRME rentals and assessment), photovoltaic systems (isySTROM_solar including Mieterstrom/tenant electricity projects), e-mobility services (isySTROM_mobil charging cards, public charging stations, home wallboxes), and operates city bus lines OF-51/52/53 plus the WaldSchwimmbad recreation facility.

Product overview

Stadtwerke Neu-Isenburg operates a multi-utility platform providing electricity (isySTROM), natural gas (isyERDGAS), drinking water (PURaqua), and heating solutions (isyWÄRME) to approximately 41,000 residents in Neu-Isenburg, Zeppelinheim, and Gravenbruch. The portfolio is structured around two core energy supply brands (isySTROM and isyERDGAS) complemented by a water brand (PURaqua), a heating-as-a-service offering (isyWÄRME), and an e-mobility offering (isySTROM_mobil). Supporting services include isyTreue loyalty card, an SAP-based customer portal, a public WiFi network (Digitale Dorflinde), and municipal public transport (ÖPNV/Stadtbuslinien). The company also operates its own electricity and gas distribution networks (Netzbetrieb) and is the designated basic supplier (Grundversorger) for both electricity and gas through end of 2027.

Differentiator

Problem solved

Functional benefit

Brands

• PURaqua: Premium drinking water brand sourced from 11 wells in the Isenburg forest, supplied by Stadtwerke Neu-Isenburg for over 125 years.
• isySTROM
• isyERDGAS
• isyWÄRME
• isySTROM_mobil
• isyTreue
• WaldSchwimmbad
• isySTROM_solar

Products and services

• isySTROM (Electricity Supply Tariffs) Electricity supply tariff family for residential, commercial, and construction customers, ranging from Grundversorgung basic supply to eco/renewable and flexible smart-meter options, including specialized Mieterstrom tenant-electricity variants.
• isyERDGAS (Natural Gas Tariffs) Natural gas supply tariffs for residential (privat), commercial (Gewerbe), and basic supply (basis/Grundversorgung) customers in the network area.
• PURaqua (Drinking Water Supply) Potable water supplied to approximately 41,000 residents in Neu-Isenburg, Zeppelinheim, and Gravenbruch from 11 local forest wells, treated at the company's waterworks and certified under the German Trinkwasserverordnung.
• isyWÄRME (Heating Solutions) Heating solutions for residential customers including an initial isyWÄRME-Check energy assessment and a rental (Pachtmodell) heating system package in which Stadtwerke plan, install, maintain, and repair the system against a monthly fee.
• isySTROM_solar (Photovoltaic Systems) Rented or purchased photovoltaic solar systems for single-family homes, two-family homes, and apartment buildings, including balcony power plants (Balkonkraftwerke) and Mieterstrom tenant-electricity installations; Stadtwerke plan, install, maintain, and insure the systems with excess power compensated via feed-in tariff.
• isySTROM_mobil (E-Mobility / EV Charging) E-mobility offering for residential and commercial customers combining public EV charging stations, a branded charging card (isySTROM_mobil), home wallbox sales and installation, an E-Mobility Check advisory service, and THG quota management.
• Netzbetrieb (Electricity & Gas Grid Operation) Electricity and natural gas distribution grid operations within Neu-Isenburg, Zeppelinheim, and Gravenbruch, including smart meter gateway rollout (intelligente Messsysteme), network connection services, and metering data management.
• ÖPNV / Stadtbuslinien (City Bus Services) Local public transport service operating city bus lines OF-51, OF-52, and OF-53 in Neu-Isenburg, coordinating regional transport connections, and offering the Hopper flexible transport service.
• WaldSchwimmbad (Municipal Swimming Facility) Outdoor and indoor swimming pool facility operated by Stadtwerke Neu-Isenburg since 2002 (originally opened 1926), offering single admission tickets and season passes with 20% loyalty discount for isyTreue card holders.

Quantifiable outcome

• 2,201 kWp total installed PV capacity across 56 systems, generating over 2 million kWh annually (enough for ~600 households)
• +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

Integration2 records

AI capability3 records

Feature9 records

Partnerships

Three partnerships are on record, tiered core.

• GEWOBAU (Gemeinnützige Wohnungsbaugesellschaft mbH Neu-Isenburg)coreStrategic or Co-development PartnerStrategic partnership for Mieterstrom (tenant electricity) projects enabling solar power generation and consumption in apartment buildings. GEWOBAU has over 2,106 PV modules (896 kWp) installed on residential buildings, generating 783,000 kWh annually. This partnership enables tenants who cannot install their own PV systems to benefit from locally generated solar energy.
• Gemeinde Neu-Isenburg (Municipality)coreStrategic or Co-development PartnerThe city of Neu-Isenburg is the sole shareholder of Stadtwerke Neu-Isenburg GmbH. The company provides essential municipal services including water supply, energy distribution, public transportation (city buses OF-51, OF-52, OF-53), and operates the WaldSchwimmbad as part of municipal Daseinsvorsorge (public service obligation). The city and company collaborate on renewable energy projects on municipal properties.
• Netzdienste Rhein-Main GmbHcoreTechnology or IntegrationUpstream network operator providing electricity transmission services. The gas network is connected through Netzkopplungspunkt (network coupling point) at Frankfurter Str. (B3) with ETSO/EIC-Code 37Z000000000032586, maximum capacity 2,500 m³/h.

Scale indicators7 records

Recent moves7 records

Expansion highlights5 records

Broad incumbents

• E.ON SE: One of Germany's largest energy incumbents with broad electricity/gas distribution, network operation, and customer solutions across many municipalities. Overlaps with SWNI on network regulation, Grundversorger dynamics, and renewable/heat offerings, but operates at national scale rather than as a municipal specialist.
• EnBW Energie Baden-Württemberg AG: Large integrated German energy supplier offering electricity, gas, water, heat, and e-mobility to municipal and regional customers nationwide. A broad incumbent comparable to SWNI's product categories (supply, networks, heat, mobility) but with vastly greater scale and geographic reach.

Direct peers

• Mainova AG: Frankfurt-based municipal multi-utility (electricity, gas, water, heat) serving the immediate Rhine-Main region. Closely comparable to SWNI in product mix (electricity/gas/water supply, distribution network operation, heating solutions) and regulatory Grundversorger profile, with overlapping service territory.
• N-ERGIE Aktiengesellschaft: Nürnberg-based municipal multi-utility providing electricity, gas, water, and heat to its city and surrounding region. Directly comparable to SWNI in scope (integrated multi-utility, network operator, Grundversorger, regional energy-transition services), differing primarily in scale.
• RheinEnergie AG: Cologne-area municipal multi-utility offering electricity, gas, water, and heat with a strong renewable energy and e-mobility agenda. Directly comparable to SWNI in product mix and integrated utility model, at much larger scale.
• Mainzer Stadtwerke AG: Municipal multi-utility serving Mainz with electricity, gas, water, heat, and public transport. Comparable business model and product portfolio to SWNI, including bundled renewable and mobility offerings for a mid-sized German city.
• Stadtwerke Düsseldorf AG: Düsseldorf's municipal utility providing electricity, gas, water, and heat plus mobility services. Directly comparable to SWNI as a multi-product German Stadtwerke with renewable energy and e-mobility offerings for residential and business customers.
• Stadtwerke München GmbH (SWM): Munich's municipal multi-utility providing electricity, gas, district heating, water, and public transport. Same integrated Stadtwerke model as SWNI with a far larger scale, useful as a strategic benchmark for service breadth and energy-transition deployment.

Regional players

• Energieversorgung Offenbach AG (EVO): Multi-utility headquartered in Offenbach am Main, directly adjacent to Neu-Isenburg. Offers electricity, gas, water, heat, and e-mobility to a neighboring municipal territory, making it the most immediate geographic and product peer to SWNI.
• HEAG Südhessische Energie AG (HSE): Darmstadt-based regional energy supplier (part of HEAG group) serving the southern Hesse area around the Rhine-Main region. Comparable to SWNI as a regional electricity, gas, and heat supplier with overlapping geography in southern Hesse.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks5 records

Key highlights7 records

Customer concentration

• Facebookfacebook.com/StadtwerkeNeuIsenburg
• LinkedInlinkedin.com/company/stadtwerke-neu-isenburg-gmbh
• Instagraminstagram.com/stadtwerkeneuisenburg

Compliance7 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 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 Neu-Isenburg