Deelstroom Delft

What Deelstroom Delft does

Deelstroom Delft is a Dutch energy cooperative (Coöperatie Deelstroom Delft U.A.) founded on 31 May 2017 in Delft, Netherlands, structured as a non-profit, member-owned entity. It enables Delft residents who cannot install private solar panels — typically renters, monument occupants, or households with shaded or insufficient roofs — to co-own renewable generation by purchasing 'stroomdelen' (power shares), where each unit represents 100 Wp of installed capacity priced at €100–€120. Members finance collective solar arrays mounted on municipal, educational, and commercial rooftops under 'Recht van Opstal' (right of superficies) agreements; completed projects include Stadskantoor (2018), Gymzaal Loevesteinplaats (2020), Sporthal Buitenhof with climate-roof features (2021), Scholencombinatie Delfland (2022), and KD-lab (in development 2025). Cumulative operating track record stands at 1,024 panels across four completed sites, ~321,000 kWh annual generation (1,000,000 kWh cumulative as of May 2024), and 314 participating Delft residents.

The cooperative's technology stack combines standard solar PV hardware with SolarEdge real-time monitoring, Econobis administrative software for member and project accounting, and the Mijn Deelstroom member portal. Product innovations include the standardized stroomdeel unit enabling fractional participation, climate roofs pairing solar panels with sedum green borders for water buffering and biodiversity, and the Rable portable mounting system at KD-lab designed for structurally weak roofs. Since 2021, the cooperative has operated as a licensed energy retailer under the sub-brand Deelstroom Delft | om, supplying 100% locally and regionally generated green electricity via the national om|nieuwe energie cooperative collective; it claims to be the first Dutch energy supplier to credit profits directly back to customer bank accounts.

The business model is non-profit and member-funded: €10 average annual membership contributions, one-time stroomdelen investments, lease financing for the Stroomdelen+ accessible tier (≈€12 per stroomdeel), and operating income from the energy supply arm. Returns to participants come from 15-year Dutch SCE subsidies, energy sales, and tax refunds (energiebelasting). The cooperative works closely with 015Duurzaam on energy coaching and with the municipality, water authority (Hoogheemraadschap Delfland), schools, Rabobank, and others; board-level governance was formally separated from 015Duurzaam in 2025. Activities are confined to the Delft region with no announced geographic expansion.

Name

Deelstroom Delft

Legal name

Coöperatie Deelstroom Delft

Website

https://deelstroomdelft.nl

Company type

Private

Founded year

2017

Operating status

Operating

Headcount range

11–50 employees

Short description

Deelstroom Delft is a Dutch non-profit energy cooperative founded in 2017 that lets Delft residents co-invest in shared rooftop solar installations via standardized 'stroomdelen' (power share) units, while also operating a local green-electricity retail supply under the Deelstroom Delft | om brand.

Ownership category

akta.pro rank

Product category

Community Solar Energy Services

NAICS

Solar Electric Power Generation (221114)

SIC

Cogeneration Services & Small Power Producers (4991)

akta.pro primary industry

Renewable Distributed Generation (Rooftop/Onsite Solar, Small Wind, Small Hydro) (EUACALAJ)

akta.pro secondary industry

DER Financing, Contracting & Program Management (PPAs, Shared Savings, Performance) (EUAFAHAL)

Keywords

• Community energy cooperative
• Collective solar installations
• Local green energy supply
• Rooftop solar projects
• Energy transition services

Headquarters

HQ city

Delft

HQ country

Netherlands

HQ region

Europe

Offices1 record

Markets served

GTM type

B2C

Offering type

Services

Cost components

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

Revenue model

1. Membership Fees: Annual voluntary membership contribution averaging €10 per year per member, providing access to participate in projects and decision-making.
2. Stroomdelen (Power Share) Investments: Members purchase stroomdelen at €100-120 per unit (100 Wp). Each unit generates 84-92 kWh annually. Revenue comes from government subsidies (SCE) for 15 years and energy sales, distributed to participants after deducting administrative costs.
3. Energy Delivery (Deelstroom Delft |om): Since 2021, the cooperative acts as a licensed energy supplier, providing 100% locally and regionally generated green energy directly to customers. First Dutch energy supplier to directly pay profits back to customers' bank accounts.
4. Installation Leasing (KD-lab): The KD-lab installation is leased to the building owner, who directly consumes the generated energy on-site, solving grid congestion problems while providing rental income to the cooperative.
5. Stroomdelen+ (Accessible Participation): Accessible participation option at 1/10th the normal price (approximately €12 per stroomdeel) for participants who cannot afford the full investment. The cooperative provides financing through lease contracts.

Pricing tiers

Go-to-market motion1 record

Distribution channels4 records

Marketing channels7 records

Core offering

Deelstroom Delft is a non-profit energy cooperative that develops collective solar panel installations on rooftops of municipal, educational, and commercial buildings in Delft, Netherlands. Delft residents become members and purchase "stroomdelen" (power shares representing 100 Wp capacity) to invest in shared solar installations and receive annual returns from energy production and government subsidies. The cooperative also operates as a licensed energy supplier under the brand Deelstroom Delft | om, delivering 100% locally and regionally produced green energy directly to customers.

Product overview

Deelstroom Delft is a non-profit energy cooperative founded in May 2017 that enables Delft citizens to participate in local renewable energy production through collective solar panel installations on municipal and institutional rooftops. The core offering consists of Stroomdelen (electricity shares) and Stroomdelen+, which allow members to invest in 100 Wp solar panel units and receive annual returns from energy production. Through its sub-brand Deelstroom Delft | om, the cooperative also supplies 100% locally-produced green energy directly to customers, distinguishing itself as the first Dutch energy supplier to credit profits straight to customers' bank accounts. Energy coaching services are delivered through the 015Duurzaam partnership, offering residents free advice on energy conservation and sustainable home improvements.

Differentiator

Problem solved

Functional benefit

Products and services

• Stroomdelen (Electricity Shares) Unit-based investment system where one stroomdeel represents 100 wattpeak (Wp) capacity in a collective solar installation. Members purchase shares at €100-€120 per unit, with each unit generating 84-92 kWh annually. Returns come from government subsidies (SCE) over 15 years and energy sales distributed to participants. Targeted at Delft residents who cannot install their own solar panels due to renting, monuments, or shading issues.
• Stroomdelen+ Affordable participation option available for one-tenth of the regular Stroomdeel price (approximately €12 per stroomdeel), making solar energy investment accessible to participants who cannot afford the full investment. The cooperative provides financing through lease contracts, with a minimum of 10% of stroomdelen per project reserved for this option.
• Collectieve Zonnepaneelinstallaties (Collective Solar Panel Installations) Shared solar panel installations on municipal, educational, and commercial rooftops in Delft, including projects at Stadskantoor, Sporthal Buitenhof, Gymzaal Loevesteinplaats, Scholencombinatie Delfland, and KD-lab. Enables citizens to invest in and benefit from local renewable energy production through collective ownership.
• Deelstroom Delft | om (Energy Supply) Licensed energy supply service providing 100% locally and regionally produced green energy to customers. Deelstroom Delft is the first energy supplier in the Netherlands to directly credit profits to customers' bank accounts. Part of the om|nieuwe energie collective of local energy cooperatives.
• Energiecoaching (via 015Duurzaam) Free energy conservation advisory services including home energy assessments, advice on insulation, heating systems, and sustainable living practices. Includes equipment lending such as thermal cameras and energy monitors. Delivered through partnership with 015Duurzaam organization at OPEN library, DOK, and through home visit appointments.

Quantifiable outcome

• 320,999 kWh annual green energy production (as of homepage)
• +5 more outcomes

Named customers7 records

Segments4 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature3 records

Partnerships

Ten partnerships are on record, tiered core and minor.

• Kabeldistrict BVcoreStrategic or Co-development Partner · 11 November 2024Kabeldistrict BV and Deelstroom Delft formed a unique partnership for the KD-lab solar project. The cooperative installs a temporary solar panel system on the building roof and leases it to Kabeldistrict BV, which consumes the generated energy on-site. This arrangement solves grid congestion problems while enabling local energy production.
• RablecoreTechnology or Integration · 11 November 2024Rable provides the innovative underconstruction system for the KD-lab project. Their portable framework allows solar panel installation on relatively structurally weak roofs and can be relocated after the 10-year project period ends.
• Gemeente Delft (Municipality of Delft)coreStrategic or Co-development PartnerThe municipality provides building rooftops for collective solar installations through Recht van Opstal agreements. Delft city council decided in 2017 to make municipal building roofs available. The municipality also provides co-funding for projects and supports the energy transition goals.
• 015DuurzaamcoreStrategic or Co-development PartnerClosely aligned organization providing energy coaching services to Delft residents. Joint initiative for energy conservation, home energy assessments, and community education. Deelstroom Delft and 015Duurzaam are administratively separated but operationally intertwined.
• om|nieuwe energie (Samen Om)coreStrategic or Co-development PartnerNational collective of local energy cooperatives. Deelstroom Delft |om is co-founder and active participant. This collective enables cooperatives to jointly supply energy to customers nationwide as the only cooperative national energy supplier without profit motive.
• Hoogheemraadschap DelflandminorGTM or Marketing PartnerWater management authority that co-funded the Sporthal Buitenhof climate roof project and participated in the official opening ceremony.
• RabobankminorGTM or Marketing PartnerCo-funder of the Sporthal Buitenhof climate roof project, contributing to the financing of the first climate roof in Delft.
• Platform Energietransitie DelftminorStrategic or Co-development PartnerLocal platform coordinating energy transition efforts in Delft; partner in 015Duurzaam initiative.
• UrgendaminorGTM or Marketing PartnerNational sustainability organization partnering on campaigns such as 'Zet m op 60!' (CV temperature reduction) and supporting energy conservation initiatives.
• HoomminorStrategic or Co-development PartnerOrganization providing online energy coach training that Deelstroom Delft members can access at discounted rates.

Scale indicators11 records

Recent moves6 records

Expansion highlights5 records

Direct peers

• Wocozon: Dutch cooperative offering collective rooftop solar investment products (zonne-aandelen) on public/commercial buildings. Closest direct peer to Deelstroom's stroomdelen model with national rather than single-city footprint.
• ZonnepanelenDelen: Online platform that crowdsources financing for Dutch solar projects and offers participaties to investors. Comparable business model in collective solar ownership and returns, though run as a commercial platform.
• om|nieuwe energie (Samen Om): National federation of Dutch local energy cooperatives of which Deelstroom is a co-founder. Operates the same cooperative green-energy supply model; Deelstroom Delft |om supplies electricity under this umbrella.
• Energie Samen: National trade association for Dutch energy cooperatives; represents and supports local cooperatives including Deelstroom. Peer in cooperative structure and collective renewable energy ownership.

Broad incumbents

• Pure Energie: Netherlands-based green energy company developing, producing, and supplying renewable electricity nationwide. Incumbent in green supply with both generation assets and retail supply.
• Vandebron: Major Dutch green energy supplier offering locally produced energy with transparent sourcing. Competes with Deelstroom Delft |om in retail green energy supply but operates commercially at national scale.
• Greenchoice: One of the largest Dutch green electricity and gas suppliers. Broad incumbent offering renewable supply across NL, contrasting with Deelstroom's local non-profit supply model.

Emerging players

• Windunie: Dutch cooperative of wind/solar project owners and local energy initiatives supporting collective renewable generation. Adjacent cooperative model with broader technology focus (wind + solar).

Regional players

• SolarShare / SolarEnergy UK member coops: UK and other European community-energy cooperatives running shared rooftop solar with member financing. Conceptually identical cooperative PV model in non-Dutch geographies; useful for cross-border model comparison.

Others

• Hoom: Organization providing online energy-coach training that Deelstroom members access at discounted rates. Ecosystem partner enabling the energy-coaching volunteer network rather than a direct competitor.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat4 records

Key risks5 records

Key highlights7 records

Customer concentration

• Facebookfacebook.com/deelstroomdelft

Revenue estimate

Valuation estimate

Number of profiles

Profiles7 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 Deelstroom Delft