At CheckWatt, we maximize the value of your battery by making it available for multiple services and markets — and optimizing across them. CheckWatt controls batteries in all market segments: in households, commercial properties and utility scale parks.
A battery is versatile, and the value it creates can be divided into several categories.
To ensure that the electricity system is always in balance, transmission system operators such as Svenska kraftnät and Fingrid purchase various types of ancillary services. Batteries connected to CheckWatt help avoid frequency disturbances by providing the ancillary services FCR-D and FCR-N, as well as mFRR, which restores system balance when needed. For larger sites equipped with a local frequency meter, FFR is also delivered.
Through CheckWatt, battery owners can sell flexibility to local grid owners (or DSOs) to support the grid during periods when the grids are strained. These situations typically occur during a few dozen hours per year but are often well compensated. Around 10 percent of CheckWatt’s customers currently live in areas where the grid owner procures flexibility during the winter months. In previous winters, revenues from providing local flexibility have amounted to just under €100 for a 10 kW / 10 kWh battery system — which adds to the income from ancillary services and electricity cost savings.
CheckWatt uses artificial intelligence to analyze and forecast how electricity is used and produced in the property. Based on this, charging and discharging are managed to reduce electricity costs, for example by storing excess solar power and shifting electricity consumption to hours with low prices. By using a limited range of the battery’s energy and power for these services, the battery can deliver ancillary services in parallel.
Below you can find example revenues for Swedish battery systems connected to CheckWatt. Revenues will differ from market to market. In earlier years, revenue mainly came from the delivery of FCR-D, which then was the most profitable ancillary service. Today, revenue increasingly comes from a variety of ancillary services and local flexibility — and savings from services in the household or property such as self-consumption of solar energy and electricity price optimization.
Time period
date-range
Residential system
10 kW / 10 kWh
Per month
Industry
250 kW / 250 kWh
Per month
Utility
1 MW / 1 MWh
Per month
Residential system
10 kW / 10 kWh
Per month
Industry
250 kW / 250 kWh
Per month
Utility
1 MW / 1 MWh
Per month
Historically, revenue from batteries connected to CheckWatt have primarily come from the delivery of ancillary services. Here, we use historical prices for the ancillary service FCR-D which dominated battery revenues until the summer of 2024. The compensation is calculated after safety margins in bidding as well as after fees to CheckWatt, installation partners, and the balance responsible party. In practice, these compensations may vary from customer to customer. The prices for ancillary services are published on Svenska kraftnät’s website Mimer.
These deductions are assumed in the calculation:
Residential systems using CheckWatt’s control typically combine delivery of ancillary services with local services that reduce electricity costs, such as increased self-consumption of solar power and electricity price optimization. These savings vary from customer to customer depending on whether they have a time-of-use electricity contract and the battery’s storage capacity. In the calculation, we have assumed a fixed monthly saving of 50 SEK for a 10 kW system.
In addition to batteries, flexible resources such as solar power systems, wind turbines, electric vehicle chargers, and flexible consumption can be intelligently controlled to create value. By connecting and managing these resources in real time, they can help balance the power grid — while also increasing profitability for the owner.
CheckWatt can optimize the production of solar power systems based on factors such as electricity prices, imbalance costs, contract structures, and the capacity of grid connections. We also pre-qualify larger solar parks for the delivery of ancillary services.
CheckWatt also monitors and controls wind turbines. For example, production can be adjusted down during negative electricity prices or combined with energy storage to optimize import and export at a grid connection.
CheckWatt manages fast chargers with the aim of improving cost efficiency and maximizing charging speed. When combined with batteries, our customers can deliver ancillary services and reduce the grid connection capacity, while still providing fast charging to their customers. Our solution can also be optimized to utilize local solar power production. Additionally, CheckWatt supports customers in managing flexible connection agreements, where the grid owner has the right to limit consumption during periods of high load in the grid.
CheckWatt controls and delivers ancillary services from flexible electricity users such as industrial fans and heaters. Typically, this involves getting paid for reducing or shutting off electricity consumption during times when there is an imbalance between production and consumption in the power system.
CheckWatt can optimize the production of solar power systems based on factors such as electricity prices, imbalance costs, contract structures, and the capacity of grid connections. We also pre-qualify larger solar parks for the delivery of ancillary services.
CheckWatt also monitors and controls wind turbines. For example, production can be adjusted down during negative electricity prices or combined with energy storage to optimize import and export at a grid connection.
CheckWatt manages fast chargers with the aim of improving cost efficiency and maximizing charging speed. When combined with batteries, our customers can deliver ancillary services and reduce the grid connection capacity, while still providing fast charging to their customers. Our solution can also be optimized to utilize local solar power production. Additionally, CheckWatt supports customers in managing flexible connection agreements, where the grid owner has the right to limit consumption during periods of high load in the grid.
CheckWatt controls and delivers ancillary services from flexible electricity users such as industrial fans and heaters. Typically, this involves getting paid for reducing or shutting off electricity consumption during times when there is an imbalance between production and consumption in the power system.
CheckWatt is a company that manages energy resources in a smart way. All CheckWatt installations are carried out by our experienced partner companies. Find an installer near you.
Together, we’re making the power system smarter and more renewable.
För att säkerställa att elsystemet alltid är i balans handlar Svenska kraftnät upp olika typer av stödtjänster.
Batterier i CheckWatts virtuella kraftverk Currently bidrar exempelvis med att upprätthålla frekvensen vid driftstörningar genom stödtjänsterna FCR-D upp och ned och FCR-N. För större anläggningar med en lokal frekvensmätare levereras även FFR. Framöver kommer batterier inom CheckWatts virtuella kraftverk även kunna leverera stödtjänsterna mFRR och aFRR. Även om just FCR-D och FCR-N gått ner i pris till följd av den snabba utbyggnaden av batterier är stödtjänster generellt sett fortfarande det mest lönsamma användningsområdet för batterier.
Den som har egna solceller kan använda batteriet för att lagra solel så att den kan användas när solen har gått ner. Det är den vanligaste användningen för system som inte är anslutna till CheckWatts tjänster, men eftersom det är relativt liten skillnad mellan vad man får betalt för den el man säljer och den el man köper är lönsamheten för detta begränsad.
För ett batteri på 10 kW och 10 kWh som enbart användes för att lagra solel mellan november 2023 och oktober 2024 låg besparingen på runt 500 kronor.
Ovan visas värdet av att leverera olika stödtjänster på spotprismarknaden under perioden 1 november 2023 till den 31 oktober 2024 för ett system på 1 MW / 1 MWh. Fram till sommaren 2024 var FCR-D oftast den mest lönsamma stödtjänsten. Sedan dess har andra stödtjänster såsom FCR-N, mFRR och aFRR alltmer frekvent varit mer välbetalda än FCR-D.
Till höger syns intäkter av en optimal planering där den mest lönsamma stödtjänsten har valts för varje timme. I realiteten är det omöjligt att skapa perfekta prognoser. Därför ska utfallet ses som en fingervisning om vilken potential som finns för ersättningen när man kombinerar leverans av olika stödtjänster.