OpenEnergyMonitor
OpenEnergyMonitor designs and sells open-source hardware and software for home energy, solar PV, and heat pump monitoring, built on Raspberry Pi and Arduino platforms and sold direct-to-consumer via its own online shop.
- Company typePrivate
- Founded2009
- HeadquartersPenrhyn Deudraeth, United Kingdom
- Headcount11–50
- GTM typeB2C
- OfferingHardware or Manufacturing
What OpenEnergyMonitor does
OpenEnergyMonitor is a privately held open-source project founded in 2009 by Trystan Lea and Glyn Hudson, headquartered in Eryri (Snowdonia), North Wales, UK. The company designs and sells a modular energy monitoring ecosystem built on Raspberry Pi and Arduino platforms, centered on the emonPi3 base station - a 6-channel electricity monitor with integrated Raspberry Pi that supports single or three-phase monitoring, wired temperature sensing, and pulse counting. The system is extended wirelessly via emonTx6 (additional current transformer channels) and emonTH2 (temperature/humidity) nodes communicating over 433.92MHz RFM69CW radio, with data processed and visualized through EmonCMS, an open-source web application runnable locally or on emoncms.org, and supported by emonHub for protocol interfacing and emonSD as a pre-built Raspberry Pi image. Specialized bundles extend the platform into heat pump monitoring (with M-Bus/Modbus integration for heat meters), PV surplus diversion via the Mk2 PV Router, and EV charging monitoring via EmonEVSE.
The company monetizes exclusively through direct-to-consumer hardware sales via its own e-commerce storefront (shop.openenergymonitor.com), with no third-party resellers, no subscription SaaS revenue, and no disclosed institutional funding. Customers are primarily residential: homeowners monitoring electricity consumption, solar PV owners tracking generation and self-consumption, and heat pump owners optimizing system performance. A secondary segment comprises sustainable energy researchers and DIY maker communities supported through GitHub repositories, technical documentation, and an active community forum. Current research and product focus centers on heat pump performance, anchored by the HeatPumpMonitor.org community data initiative. Pricing is quote-based and not publicly disclosed; the company does not hold patents or listed certifications, and operates as an independent founder-led project with no parent company.
OpenEnergyMonitor firmographics
Firmographics- Name
- OpenEnergyMonitor
- Legal name
- OpenEnergyMonitor
- Website
- https://openenergymonitor.org
- Company type
- Private
- Founded year
- 2009
- Operating status
- Operating
- Headcount range
- 11–50 employees
- Short description
- OpenEnergyMonitor designs and sells open-source hardware and software for home energy, solar PV, and heat pump monitoring, built on Raspberry Pi and Arduino platforms and sold direct-to-consumer via its own online shop.
- Ownership category
- akta.pro rank
OpenEnergyMonitor industry classification
Industry- Product category
- Energy Monitoring Hardware
- NAICS
- Automatic Environmental Control Manufacturing for Residential, Commercial, and Appliance Use (334512)
- SIC
- Electronic & Other Electrical Equipment (No Computer Equip) (3600)
- akta.pro primary industry
- Home Energy & EV Charging (HEMS, Smart Meters, Batteries, Chargers) (HSAPAQAF)
- akta.pro secondary industries
- Microgrids & Energy Management Controllers (Campus/Community/Industrial) (EUADAPAE), Remote Operations, Control Room & Digital O&M (Monitoring, Diagnostics) (EUAEAGAM), Smart Energy Management (Meters, EV Chargers, Solar/Battery Monitors) Retail (CRACAGAI), Smart Plugs, Outlets & Energy Monitoring Retail (CRAIAMAJ), Charging Network Operators & CPOs Offering Smart Charging/V2G (EUAFAMAD)
Keywords
Where OpenEnergyMonitor is headquartered
LocationHeadquarters
- HQ city
- Penrhyn Deudraeth
- HQ country
- United Kingdom
- HQ region
- Europe
Offices1 record
Markets served
OpenEnergyMonitor business model
Business model- GTM type
- B2C
- Offering type
- Hardware or Manufacturing
- Cost components
- Personnel, Supply Chain, Operations, Technology or R&D, Marketing or Sales
Revenue model
- Hardware Sales: Sale of monitoring hardware including emonPi3, emonTx6, emonTH2, CT sensors, AC/AC adapters, heat pump monitoring bundles, and accessories through their online shop.
Go-to-market motion1 record
Distribution channels1 record
Marketing channels5 records
OpenEnergyMonitor product offering
Product offeringCore offering
OpenEnergyMonitor designs, manufactures, and sells open-source hardware and software for monitoring electricity use, solar PV generation, and heat pump performance. Its product ecosystem centers on the emonPi3 base-station (a 6-channel electricity monitor with integrated Raspberry Pi), paired with expandable wireless sensor nodes (emonTx6, emonTH2), CT current transformers, voltage sensors, and the EmonCMS open-source web application for local or remote data logging and visualization. The company sells these products directly to consumers, researchers, and enthusiasts through its own e-commerce storefront.
Product overview
OpenEnergyMonitor is an open-source energy monitoring ecosystem built on Raspberry Pi and Arduino platforms. The core system consists of emonPi3 (a 6-channel electricity monitor with integrated Raspberry Pi) as the base-station, which works with expandable sensor nodes including emonTx6 (additional CT channels) and emonTH2 (temperature/humidity sensors). Data is processed and visualised via EmonCMS (runnable locally or on EmonCMS.org), with emonHub managing data interfacer communications. The product line also includes CT sensors, emonVs voltage sensors, and a pre-provisioned Heat Pump Monitor Bundle for specialised heat pump monitoring applications. All hardware and software is fully open-source.
Differentiator
Problem solved
Functional benefit
Products and services
- emonPi3
Quantifiable outcome
- Heat pump monitoring with COP (Coefficient of Performance) calculation
- +2 more outcomes
Companies that use OpenEnergyMonitor
Customer profileSegments5 records
Ideal customer profiles4 records
OpenEnergyMonitor technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- Yes
- API docs
- API detail
Core technology
AI maturity
App detail
Integration4 records
AI capability1 record
Feature7 records
OpenEnergyMonitor partnerships and signals
Strategic signalScale indicators2 records
Recent moves5 records
Expansion highlights4 records
OpenEnergyMonitor competitors and assessment
Company assessmentDirect peers
- Smappee: European smart energy monitor (Belgium) offering Genius hub with CT clamps, solar monitoring and EV charging integration. Closely comparable smart energy management hardware for residential and SMB customers across European geographies.
- Emporia Energy: Emporia makes CT- and smart-circuit-based home energy monitors with cloud dashboards and integrations for solar and EV. Directly comparable product feature set (multi-channel CT monitoring, solar monitoring, EV charging awareness) targeting the same prosumer/home energy customer.
- Current Cost (Envi): Pioneer in whole-home energy monitoring displays that used clip-on CT sensors for real-time consumption tracking. Historical UK competitor in the same DIY/home energy monitoring category that OpenEnergyMonitor serves.
- Sense: Sense makes an app-driven home energy monitor that uses ML on a single sensor to identify individual appliance consumption. Competes directly with OpenEnergyMonitor for the same home energy monitoring use case, though with a polished consumer UX rather than DIY/Raspberry Pi architecture.
Broad incumbents
- Enphase Energy: Solar microinverter leader with growing home energy monitoring and battery/EV integration via the IQ system. Comparable in residential solar generation monitoring but operates at much larger scale as an incumbent solar+storage vendor.
- EcoStruxure (Schneider Electric): Schneider Electric's broad energy management platform including home/building energy monitoring, solar, EV and heat pump integration. Operates across the same verticals but as part of a larger industrial/commercial portfolio rather than a residential monitor specialist.
- Tibber: European retail energy supplier combining dynamic tariffs with smart home energy device integrations (Tibber Pulse). Comparable where it bridges energy supply and smart home monitoring - overlapping with OpenEnergyMonitor's residential monitoring purpose.
Emerging players
- Home Assistant: Open-source home automation platform with a large community-driven energy dashboard feature supporting CT sensors, smart meters and solar inverters. Overlaps with OpenEnergyMonitor's EmonCMS open-source energy visualization and shares the prosumer/open-source community.
- OpenHAB: Open-source home automation platform with energy data integrations and community-driven development model. Comparable open-source ethos and ability to integrate with the same CT/energy monitoring hardware, though broader scope across home automation.
Others
- EnergyAid / Smart Energy GB (UK smart meter rollout): UK-wide smart meter rollout program providing competing real-time consumption data to households. Indirect competitor because smart meter in-home displays address the same residential visibility use case that OpenEnergyMonitor hardware targets.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat4 records
Key risks6 records
Key highlights6 records
Customer concentration
OpenEnergyMonitor social profiles
Digital presenceOpenEnergyMonitor financial estimates
Financial estimateRevenue estimate
Valuation estimate
OpenEnergyMonitor leadership team
Management profileNumber of profiles
Profiles2 records
OpenEnergyMonitor funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
OpenEnergyMonitor M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about OpenEnergyMonitor
What does OpenEnergyMonitor do?
OpenEnergyMonitor designs, manufactures, and sells open-source hardware and software for monitoring electricity use, solar PV generation, and heat pump performance. Its product ecosystem centers on the emonPi3 base-station (a 6-channel electricity monitor with integrated Raspberry Pi), paired with expandable wireless sensor nodes (emonTx6, emonTH2), CT current transformers, voltage sensors, and the EmonCMS open-source web application for local or remote data logging and visualization. The company sells these products directly to consumers, researchers, and enthusiasts through its own e-commerce storefront.
Is OpenEnergyMonitor a public or private company?
OpenEnergyMonitor is a private company. It is classified as founder individual operated bootstrapped and is currently operating.
When was OpenEnergyMonitor founded?
OpenEnergyMonitor was founded in 2009. It employs 11 to 50 people.
Where is OpenEnergyMonitor based?
OpenEnergyMonitor is headquartered in Penrhyn Deudraeth, United Kingdom, in the Europe region.
How does OpenEnergyMonitor make money?
One revenue line is on record: hardware Sales.
Who are OpenEnergyMonitor's main competitors?
Direct peers on record are Smappee, Emporia Energy, Current Cost (Envi) and Sense. Broad incumbents are Enphase Energy, EcoStruxure (Schneider Electric) and Tibber. Emerging players are Home Assistant and OpenHAB. EnergyAid / Smart Energy GB (UK smart meter rollout) is listed as an others.
Does OpenEnergyMonitor have an API?
Yes. OpenEnergyMonitor provides MQTT and HTTP APIs for data posting. The MQTT service (mosquitto) enables real-time data transmission from sensor nodes. EmonHub handles interfacer configuration for receiving data via MQTT. EmonCMS supports data posting via HTTP and MQTT protocols. EmonCMS.org provides remote data logging and visualisation. Documentation available at docs.openenergymonitor.org with sections on 'Posting data' and 'MQTT' integration. Developer documentation is at docs.openenergymonitor.org/emoncms/postingdata.html.
What industry is OpenEnergyMonitor in?
OpenEnergyMonitor's product category is Energy Monitoring Hardware. Its primary akta.pro industry code is HSAPAQAF, Home Energy & EV Charging (HEMS, Smart Meters, Batteries, Chargers), with a secondary code of EUADAPAE, Microgrids & Energy Management Controllers (Campus/Community/Industrial). Its NAICS code is 334512 and its SIC code is 3600.