CheckWatt: Battery aggregation and electricity-market flexibility

CheckWatt connects batteries and flexible assets to electricity-market services through CM10 site controls and its virtual power plant.

Summary

Best for
Owners of supported batteries and flexible equipment in participating electricity markets.
Less suited to
A stand-alone monitoring purchase without an aggregation or optimisation requirement.
Deployment
Partner-installed CM10 controller, central virtual power plant and EnergyInBalance portal.
Data in
Equipment measurements, available flexibility, dispatch feedback and market signals.
Pricing
Fees depend on installation partner, balance-responsible party and service agreement.

Overview

CheckWatt measures, monitors and controls batteries, renewable generation and flexible demand. Its service portfolio spans residential storage, commercial systems and utility-scale assets. The virtual power plant combines equipment at different sites into resources that can participate in electricity-system services, while local optimisation can also improve self-consumption or manage connection limits.

The connection workflow includes a physical controller, an installation partner and commissioning before market participation. This makes CheckWatt an operating service with equipment integration, rather than only an energy dashboard. Its role also depends on electricity retailers and balance-responsible parties where required; a connected device does not automatically qualify for every service or country.

Offering

The CM10 controller connects site equipment to CheckWatt's virtual power plant. Asset owners use EnergyInBalance to follow operation and earnings, while installation partners and market participants have separate operational tools. The services page describes ancillary services, local flexibility and behind-the-meter optimisation as different uses of the same flexible assets.

Battery operation may combine solar self-consumption and price optimisation with reserve availability. Solar and wind generation can also be curtailed or coordinated against prices and connection limits, while industrial fans and heaters provide flexible demand. CheckWatt's published revenue examples state fee and bidding assumptions. They illustrate a scenario, rather than a fixed return offered to every battery owner.

Technology

CheckWatt publishes manufacturer-specific installation material alongside its CM10 installation manual. The controller separates internet connectivity from equipment-side interfaces, including wired serial and Ethernet connections. Supported integrations use documented paths such as Modbus RTU, Modbus TCP/IP or MQTT; the exact device instructions matter more than a shared protocol label.

Its partner diagnostics announcement describes a ten-second view of connectivity, available battery information and actual power against the dispatched setpoint. That comparison is useful because a sent command and a physical response are different events. Installation, communication, commissioning and market qualification therefore remain separate stages, even when the customer ultimately sees them through one portal.

Customers

The Swedish mFRR announcement describes aggregation of more than 1,000 residential batteries through an agreement with Bixia as balance-responsible party. It reports 37 MW available from participating residential and commercial systems. This is a concrete market-access example, rather than proof that any household battery can immediately enter the same service.

The Polish expansion announcement records another stage of market development, while partner diagnostics describes operational support across a much larger connected fleet. These sources use different dates and denominators, so connected sites, approved capacity and participating assets should not be treated as interchangeable counts. The installer network remains important for commissioning and first-line support.

Company

CheckWatt's company history dates the start of operations to 2017, initially measuring renewable electricity for Sweden's electricity-certificate system. It records first ancillary-service delivery in 2022 and subsequent growth in residential battery aggregation. Its contact page lists offices in Gothenburg and the Stockholm area without identifying one as the global headquarters.

A December 2025 company statement says the proposed acquisition by Emaldo did not proceed because regulatory approvals were not obtained. CheckWatt continued as an independent aggregator, with the commercial partnership continuing. The same statement identifies Dan-Eric Archer as CEO. Older acquisition announcements therefore should not be read as evidence that Emaldo owns the company. The official company profile identifies Danderyd in the Stockholm area as headquarters and gives 2011 for the earlier business, distinct from the current operations begun in 2017.

Alternatives in virtual power plant platforms

What to look for in virtual power plant platforms

References

  1. CheckWatt services (opens in a new tab)
  2. CheckWatt company history (opens in a new tab)
  3. Connect to CheckWatt (opens in a new tab)
  4. Manufacturer installation instructions (opens in a new tab)
  5. Swedish residential batteries and mFRR (opens in a new tab)
  6. Polish market expansion (opens in a new tab)
  7. Partner real-time diagnostics (opens in a new tab)
  8. CM10 installation manual (opens in a new tab) (PDF)
  9. CheckWatt continues independently (opens in a new tab)
  10. CheckWatt offices and support (opens in a new tab)
  11. Official CheckWatt profile and Stockholm headquarters (opens in a new tab)

This profile does not imply a commercial relationship with CheckWatt and may contain inaccuracies.