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About Joulo
Thought up on a driveway. Built for every EV driver.
Joulo started between two Teslas in Brummen. Now our own team builds everything you need as an EV driver: the link with your charger, the app and your quarterly payout.
- net per kWhcustomer average
- 12.6 cents
- net per kWhcustomer average
- service feediscounts via referrals, paid out quarterly
- 20%
- service feediscounts via referrals, paid out quarterly
- retroactive fromsessions from then count
- 1 Jan 2026
- retroactive fromsessions from then count
Joulo by the numbers
- supported brands
- 67
- supported brands
- 33 via cloud, the rest via OCPP
- fastest to link
- Tesla
- fastest to link
- 3s to link · median
the mission
Accelerating the transition to electric driving.
Everything we build serves that one sentence. Electric driving should be beautiful and easy, and it is not yet everywhere. ERE's are the start: they make an electric car cheaper to run. Then comes the rest of charging: sharing your charging station with your neighbours, smart charging at the cheapest moment, and charging points for businesses and homeowner associations that we operate. Every barrier we remove brings the switch closer.
Joulo at a glance
It starts with ERE's.
Home charging yields the proof that you drive cleaner. Since the new ERE regulation, fuel suppliers buy that proof. We register it, sell it and pay out every quarter.
ERE registration for home chargers.
Earn money for every kWh you charge at home. Joulo automatically registers your charging sessions as Emission Reduction Units (ERE) with the Dutch Emissions Authority (NEa), sells them and pays you out quarterly. 20% service fee • discounts via referrals. Cancel yearly.
Works with your existing charger • the most automatic integrations.
Joulo connects directly with 15 charger brands via their own cloud API: Tesla, Easee, Wallbox, Zaptec, Smappee, V2C, Enphase, NexBlue, ChargeAmps, Ohme, go-e, Victron, Ecotap, Volt Time and SolarEdge. Different brand? Our OCPP 1.6J gateway at ocpp.joulo.nl talks to virtually every modern charger • Alfen, ABB, KEBA, Schneider, Vestel and hundreds more. On top of that, Joulo syncs straight from the backends of charging platforms and energy companies, including Plugchoice. Joulo is the only ERE registration provider combining all three connection routes: cloud API, OCPP and platform backends. Everything runs fully automatically via cloud API or OCPP • you never enter meter readings by hand. A photo or manual entry is not a valid measurement source for registration and creates audit risk in the NEa verification; Joulo uses the full session data from the backend. Not MID-certified? We arrange an upgrade to a MID charger, or you request a Secondary Allocation Point (SAP) with your grid operator. The chargers we supply we source from Rexel, our procurement partner and one of the largest electrical wholesalers.
Web, iOS and Android.
Full dashboard on joulo.nl with real-time insight into sessions, ERE's and payouts. Native apps for iPhone and Android with the same data • with 39,500+ downloads the largest ERE registration app in the Netherlands. For business partners (energy companies, installers, CPOs, fleet operators) we offer white-label landing pages, REST APIs, widgets and a partner dashboard.
our story
Fintech DNA, built for the energy market.
Before Joulo existed, we built payment-gateway architecture, audit-compliance platforms and subscription systems at scale. That fintech experience is embedded in every part of Joulo: from automated NEa registration to the audit trail behind every charging session.
As Tesla drivers with Full Self-Driving, we know how great electric driving is. When we discovered that home charging yields ERE's, proof of cleaner driving that fuel suppliers pay for, we saw the opportunity to combine fintech and energy into one platform that pays EV drivers automatically.
architecture
Built as one system
Our own team builds all four layers: connections, memory, brain and insight. Together they read your sessions, run the numbers and pay out • without manual work.
01
Connections
Joulo talks to 67 charger brands. Connecting often takes a single click.
REST API • OAuth 2.0 • OCPP 1.6J • MID verification
02
Memory
Every session, every kWh, every price • remembered and organised.
Charging sessions • EAN registration • Energy mix • Market prices
03
Brain
Automatically validate, calculate and pay out. No hassle.
NEa compliance • Anomaly detection • Market timing • Audit trail • Capptions
04
Insight
Your dashboard, app and exports • always up to date.
Real-time dashboard • iOS & Android • Widget • CSV export
ERE market
How we sell your ERE's.
A deliberate sales strategy, not speculation.
Joulo aggregates ERE's from thousands of home chargers and sells them directly to obligated parties under the Dutch Energy for Transport regulation: fuel suppliers and energy companies that must cover their annual obligation (14.4% in 2026, rising to 28.4% in 2030). By aggregating volume we negotiate terms an individual driver would never get on their own.
We pursue a deliberate strategy to consistently pay out a market-aligned price. The price itself remains subject to supply and demand • we always communicate the current guide price upfront and the actual realisation afterwards. No price guarantees, full traceability: every kWh, every certificate, every euro.
12.6 cents
net per kWh, customer average
founders background
Years of experience in fintech and compliance.
Johan has worked in energy and tech for years • from Solarplaza to Philips. Ruben has been building software and platforms for years with his company Capptions. Together we combine that experience in Joulo.
That background makes Joulo different: we understand how markets work, how to process data reliably and how to build a fair product that people trust.
- Fintech & payments
- Payment gateway architecture, transaction processing
- Energy markets & commodities
- Emission rights, RED III regulation, own account with the NEa
- Regulatory compliance
- ISO 27001 certified, MID certification, GDPR, audit trail via Capptions
- EV ecosystem & charging infra
- OCPP, charger APIs, smart charging protocols
the team
The team behind Joulo
Fintech, energy and the financial markets. The team behind every booked kWh.
Ruben Stolk
Founder • Managing Director
Fintech Architecture & Compliance
15+ years of experience in audit and compliance software. Founder of Capptions B.V. • a platform used by large enterprises to manage inspections, incidents and regulations. At Joulo he owns the fintech architecture, NEa registration and the audit trail behind every charging session. BSc Telematics (UT), MSc Computer Science & Economics (EUR).
Compliance software • Fintech • Capptions B.V. • Own account with the NEa
Drives a Tesla Model Y
Johan Trip
Founder • Managing Director
Payments & Energy
Was at the start of Solarplaza.com and served as smart meter and EV specialist at KPN. Led REX, a demand-response startup within Alliander subsidiary Entrnce, and co-built energy company ServiceHouse • since sold to Coolblue. At Philips he scaled the subscription and payment platform to 505K subscribers and €40M ARR. Combines payments-at-scale expertise with deep energy market knowledge.
Payments • Energy • Demand response • Subscriptions at scale
Drives a Tesla Model X
Harm Oosthoek
CFO
Finance & Markets
7+ years as a trader at Flow Traders • Europe's largest liquidity provider and market maker in ETFs and futures, active across equity, fixed income, FX and commodities. That's where he learned how price formation, liquidity and market structure really work. At Joulo he is CFO: he runs finance and the trading strategy behind ERE sales. MSc Financial Economics, Erasmus University Rotterdam.
Flow Traders • Market making • Commodities & futures • MSc Financial Economics
our approach
How we build
Three principles guide everything we build.
- 01
Invisible
The best infrastructure goes unnoticed
Joulo works in the background • no manual work, no hassle. Registration, validation and payouts are fully automated.
- 02
Fair
Every kWh is traceable
Every euro is accountable. Transparency is architecture: full audit trail with source, timestamp and mutations per session.
- 03
Autonomy
The system runs itself
The system learns, validates and pays out. Without intervention, without delay. Built to scale without human bottlenecks.
Use Joulo on mobile.
The app for iPhone and Android shows the same data as your dashboard.
4.7 • 250 ratings
Help build the stack for EV drivers
Are you an EV driver and want to start earning? Or interested in a partnership as an installer or consultant?