--- title: Themo acquires OptiWatti, taking a major step towards becoming Europe's leading electric heating technology provider description: Themo acquires OptiWatti, taking a major step towards becoming Europe's leading electric heating technology provider image: https://www.themo.io/hubfs/IMG24_vaaka.jpg --- [![Themo](https://www.themo.io/hubfs/themo-white.svg "Themo")](https://www.themo.io/) - [Consumers](https://www.themo.io/consumers) - [Themo Smart Thermostat](https://www.themo.io/themo-smart-thermostat) - [Themo DIN](https://www.themo.io/themo-din) - [Property companies](https://www.themo.io/property-companies) - [Rental housing companies](https://www.themo.io/property/rental-properties) - [Assisted living facilities](https://www.themo.io/property/assisted-living-facilities) - [Accommodation](https://www.themo.io/property/accommodation) - [Housing companies](https://www.themo.io/housing-companies) - [Reserve Market](https://www.themo.io/reserve-market) - [Themo Flexibility](https://www.themo.io/themo-flexibility) - [References](https://www.themo.io/en/references) - [Themo](https://www.themo.io/company) - [Contact us](https://www.themo.io/contact-us) - [Open positions](https://www.themo.io/recruitment) - [Company](https://www.themo.io/company) - [Frequently Asked Questions](https://www.themo.io/frequently-asked-questions) - [Support](https://support.themo.io/en/support/home) EN - [FI](https://www.themo.io/fi) - [NO](https://www.themo.io/no) - [ET](https://www.themo.io/et) - [LV](https://www.themo.io/lv-lv) # Themo acquires OptiWatti Article 11.11.2026 ## Themo acquires OptiWatti, taking a major step towards becoming Europe's leading electric heating technology provider With over 70,000 heating systems and more than 50 MW of connected electrical heating capacity, the combined company is accelerating its Nordic growth with the backing of a new investment. **Finland, November 2026** – Estonian-Finnish smart heating technology company Themo has acquired OptiWatti Oy, bringing together two established players in intelligent electric heating management. The acquisition marks a significant milestone in Themo's ambition to become Europe's leading electric heating technology provider. Together, Themo and OptiWatti now manage more than **70,000 electric heating systems** in homes and businesses across Finland and Norway, representing over **50 megawatts (MW) of connected electrical heating capacity**. Both companies have spent years developing technologies that make electric heating smarter, reduce electricity costs, and enable buildings to support the stability of electricity grids. By combining their technologies, expertise, and customer bases, Themo aims to accelerate innovation and expand its solutions across the Nordic countries and eventually throughout Europe. "OptiWatti has built great technology for intelligent electric heating and supporting electricity grid stability. In a market the size of Finland, it makes little sense for two companies to develop solutions to the same challenges independently when we could achieve so much more together," says **Madis Uuemaa, CEO and Co-founder of Themo**. "Our ambition is to bring intelligent electric heating technology to millions of heaters across Europe and beyond. Today, too many electric heaters still operate blindly, heating rooms regardless of whether they are occupied, what electricity costs, or what the power grid needs. By joining our technologies and teams, we can move significantly faster towards changing that.," Uuemaa continues. ## Investment supports European ambitions To support the acquisition and its next phase of growth, Themo has also successfully closed an investment round. The investment strengthens Themo's position in the Nordic energy technology market and provides a foundation for further international expansion. As part of the arrangement, **Voimatel Oy** became a minority owner of Themo. **Voimatel is a former owner of OptiWatti and a wholly owned subsidiary of Finnish investment company KPY**. "We believe in Themo's vision and its potential to grow, first in the Nordics and ultimately in the global market," says **Mika Perkiö, interim CEO of Voimatel**. "By combining Themo and OptiWatti, we are bringing together two teams with deep technological expertise and a shared ambition. We are also pleased that OptiWatti has found a strong new home where its technology, customers and years of development can continue to thrive," Perkiö adds. ## Turning electric heating into intelligent energy management Electric heating is widely used in hotels, rental apartments, student housing and other accommodation properties across the Nordic countries. Yet in many buildings, heaters still operate with little intelligence, consuming electricity even when rooms are unoccupied or heating is not needed. For accommodation providers, this means unnecessary electricity costs, limited visibility into heating consumption and little control over one of their major operating expenses. **Themo Control addresses this problem by giving property operators centralized control over their electric heating systems.** Instead of heaters operating independently, heating can be managed intelligently according to room occupancy, booking schedules and actual heating needs. The system helps operators avoid heating empty rooms unnecessarily while maintaining comfortable temperatures for guests and residents. By automating heating management, Themo enables accommodation providers to reduce electricity consumption and operating costs without requiring staff to manually adjust individual heaters. Beyond individual buildings, intelligent electric heating can also benefit the wider energy system. As electricity markets become more dynamic and renewable energy generation increases, connected heating systems can adjust their consumption to electricity prices and participate in demand response services, helping balance the power grid. The acquisition of OptiWatti strengthens Themo's capabilities in both areas: **helping property owners reduce heating costs and enabling electric heating to become a flexible resource for the electricity grid.** OptiWatti will continue serving its existing customers, with its technology and expertise becoming part of the wider Themo Group. **Themo's long-term vision is simple: electric heating should no longer operate blindly. Every electrically heated building should be able to use electricity intelligently, economically and in a way that benefits both the building owner and the wider energy system.** ## Kokemuksia ja artikkeleita ![Holiday Club Tampere](https://www.themo.io/hubfs/tampereen-kehraamo---hero---1920x1080.webp) Leisure properties Article Themo 19.5.2026 ### Holiday Club [Read the entire story](https://www.themo.io/en/references/holiday-club-clone) ![](https://www.themo.io/hubfs/DSCF0653_smalll.png) Property companies Housing companies Article Rental properties Housing associations Themo 13.10.2025 ### Themo’s Production Story [Read the entire story](https://www.themo.io/en/references/themos-production-story) ![](https://www.themo.io/hubfs/Themo45@0.5x_small.png) Property companies Consumers Article Themo 3.10.2025 ### Grid – it’s all about balance [Read the entire story](https://www.themo.io/en/references/grid-its-all-about-balance) [![Themo](https://www.themo.io/hubfs/themo-white.svg "Themo")](https://www.themo.io/) [info@themo.io](mailto:info@themo.io) Äyritie 8a 01510 Vantaa, Finland [Follow us on Facebook](https://www.facebook.com/ThemoSuomi/) [Follow us on LinkedIn](https://www.linkedin.com/company/smart-load-solutions/) ## [Consumers](https://www.themo.io/consumers) - [Themo Smart Thermostat](https://www.themo.io/themo-smart-thermostat) - [Themo DIN](https://www.themo.io/themo-din) ## [Property companies](https://www.themo.io/property-companies) - [Rental housing companies](https://www.themo.io/property/rental-properties) - [Assisted living facilities](https://www.themo.io/property/assisted-living-facilities) - [Accommodation](https://www.themo.io/property/accommodation) ## [Housing companies](https://www.themo.io/housing-companies) ## [Reserve Market](https://www.themo.io/reserve-market) - [Themo Flexibility](https://www.themo.io/themo-flexibility) ## [References](https://www.themo.io/en/references) ## [Themo](https://www.themo.io/company) - [Contact us](https://www.themo.io/contact-us) - [Open positions](https://www.themo.io/recruitment) - [Company](https://www.themo.io/company) - [Frequently Asked Questions](https://www.themo.io/frequently-asked-questions) ## [Support](https://support.themo.io/en/support/home) © 2025 | All right reserved | [Privacy Policy](https://www.themo.io/privacy-policy)  | [Declaration of Conformity](https://www.themo.io/hubfs/Declaration%20of%20Conformity_Themo%20Wall%20-%20Themo%20DIN_%20700_700%2B900.pdf) | [General Terms and Conditions](https://www.themo.io/themo_app_terms) ```json { "@context" : "https://schema.org", "@type" : "BlogPosting", "author" : { "@type" : "Person", "name" : "Themo", "url" : "https://www.themo.io/en/references/author/themo" }, "dateModified" : "2026-11-11T09:51:02.925Z", "datePublished" : "2026-11-11T09:51:02.000Z", "headline" : "Themo acquires OptiWatti, taking a major step towards becoming Europe's leading electric heating technology provider", "image" : [ "https://www.themo.io/hubfs/IMG24_vaaka.jpg" ], "mainEntityOfPage" : { "@id" : "https://www.themo.io/en/references/themo-acquires-optiwatti-taking-a-major-step-towards-becoming-europes-leading-electric-heating-technology-provider", "@type" : "WebPage" }, "publisher" : { "@type" : "Organization", "logo" : { "@type" : "ImageObject", "url" : "https://www.themo.io/hubfs/ThemoControl_logo_white-1.svg" }, "name" : "Themo Nordic Oy" } } ```