Why use home ESS from AEMA?
Use Affordable Battery-Powered Electricity Without Worry With AEMA’s smart home battery, you can take advantage of electricity price fluctuations on the energy market. The battery automatically charges when market electricity prices are low and acts as an energy storage system. It then discharges the stored electricity when prices rise again, allowing you to use power worry-free exactly when you need it. AEMA system can also function as a backup power source during outages with the help of a separately sold backup device. The electricity stored in the ESS can keep essential appliances like your fridge, freezer, and lights running during a power outage.
Your financial benefits
Below is an example of a financial estimate for a medium-sized house using a 21 kWh battery. Batteries are also available in 14 kWh and 28 kWh capacities. The appropriate battery size will be determined during a site assessment with our specialists. Equipment prices range from €52.99/month to €94.99/month (on a 120-month interest-free and fee-free credit plan). A one-time payment option is also available.
The examples are based on real electricity consumption profiles from approximately one hundred detached houses, modeled using electricity prices from December 2022 to December 2023.
Example Calculation: 21 kWh Battery
Suitable for a medium-sized detached house, approximately 150 m². You can find more example calculations in the FAQ section.
You can also get a personalized savings estimate using our savings calculator.
| Benefit | Amount |
|---|---|
| Benefit amount notes utilization of low-cost hours | + €21.85/month
(Range: €0–86/month depending on the season) |
| Battery reserve compensation | + €50/month
(Estimated average compensation level, guaranteed until the end of 2025) |
| Storage of excess solar energy | + €18/month
(Depends on solar panel output and electricity prices) |
| Hybrid inverter for your solar panel investment | + €15/month
(Assuming a purchase price of €1800 and 10-year usage period) |
| Price of Kotiakku (21 kWh) | – €69.99/month
(120-month credit plan) |
| Total Impact | = €29.86/month
On average, you come out ahead |
Reduce emissions
Especially during the winter season, when electricity consumption is at its highest, Finland has had to rely heavily on backup power plants that produce significant emissions. Electricity is typically at its cheapest when a large share comes from low-emission renewable energy sources. By charging your Kotiakku during off-peak hours and using the stored energy during peak demand, you not only save money but also help the environment.
As wind and solar power become more widespread, electricity production is increasingly variable. To further increase the share of renewable energy, consumption must become more flexible—battery systems like Kotiakku are a key part of this solution.
Our app
You can monitor the system’s performance through the AEMA app. The app shows real-time energy flow and allows you to explore historical energy data. For example, you can see how AI has managed the charging and discharging of the batteries, and whether your solar panel output has been used for consumption, stored in batteries, or fed into the grid.
The app, developed by AEMA, is available for both iOS and Android devices.
Why choose AEMA?
AEMA has extensive experience in electricity usage optimization and operating in reserve markets. Since 2022, we’ve developed a battery reserve for our mobile base station network, optimizing electricity use and participating in the electricity reserve markets maintained by Fingrid. With AEMA, you can trust in both system reliability and top-tier data security—developed and maintained in Finland.
Frequently asked questions
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How much can I save with AEMA? (Example calculations)
AEMA generates savings by leveraging fluctuations in electricity spot prices and participating in reserve markets as part of Elisa’s battery reserve. Example calculations for different battery sizes are provided below:
Example сalculation for 14 kWh (recommended for annual consumption under 15,000 kWh, typically under 100 m²)
Place for data tables
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When will AEMA’s availability expand?
AEMA’s geographical availability is continuously expanding based on demand. If you reside outside the current service area and are interested in acquiring AEMA, you can still submit your information via the form. We consider received forms in planning future area expansions and will contact you once Kotiakku becomes available in your region.
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How does AEMA work?
AEMA charges electricity during low spot price periods and utilizes the stored energy when prices are higher. It also safeguards your home against power outages. Kotiakku is integrated into AEMA’s battery reserve and is used to balance Finland’s electricity grid.
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Can I use AEMA without solar panels?
Yes, AEMA functions excellently even without solar panels by taking advantage of spot price fluctuations and protecting your home from power outages.
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What are the benefits of AEMA with solar panels?
With solar panels, AEMA allows for the storage and later use of solar electricity, enhancing your energy self-sufficiency and saving on transmission fees and taxes.
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I have solar panels. Is my inverter compatible?
AEMA’s software controls the inverter, which in turn manages the battery system. Therefore, AEMA Beta includes a compatible hybrid inverter with AEMA’s settings. Existing inverters cannot be used, but if certain conditions are met, we offer a trade-in benefit.
Trade-in benefit: ● Hybrid inverter compensation: €1,000 regardless of model
● Non-hybrid inverter compensation: €500 regardless of model
● We only compensate for functional inverters used for less than 3 years
● The inverter must be in use at the specified property
● Elisa reserves the right to make changes to the compensation prices, terms, or validity -
What is the operational logic of AEMA?
AEMA automatically adjusts consumption to the cheapest hours of the day, requiring no action from the customer. Its operational logic is to charge the battery during the day’s cheapest hours and use the stored energy when prices are higher. The system also considers losses from charging and discharging, acting only when price differences are sufficiently significant.
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What is the appropriate battery size and price for me?
The suitable battery size is determined during a survey visit. The most significant factor is annual electricity consumption, which depends on the house’s size and heating method. With solar panels, it’s advisable to choose a battery one size larger than recommended to store surplus production.
Battery options: ● 14 kWh battery: €52.99/month, 120-month credit sale; for annual consumption under 15,000 kWh, typically under 100 m²
● 21 kWh battery: €69.99/month, 120-month credit sale; for annual consumption between 15,000 – 20,000 kWh, typically 100 – 200 m²
● 28 kWh battery: €94.99/month, 120-month credit sale; for annual consumption over 20,000 kWh, typically over 200 m² -
What type of houses is AEMA available for?
Currently, Kotiakku is sold only to detached and semi-detached houses with a spot electricity contract. If solar panels are in use, the peak power should be under 15 kWp, and only one inverter should be in use. It’s also advisable to ensure no major renovations are planned that would prevent Kotiakku installation.
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Is AEMA easy to install?
AEMA provides installation and takes care of battery maintenance as part of the service. You don’t need to worry about technical details.
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What kind of space is needed for AEMA?
The equipment placement is agreed upon during the survey visit with an authorized electrician and AEMA’s service installer. The battery is placed in a warm, sheltered space. In addition to the battery, a hybrid inverter and, if desired, a backup device are installed. The inverter and backup can be installed outdoors.
Typically, the battery is placed in a garage, warm storage, or technical room. Batteries cannot be installed in living spaces.
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What if I move?
AEMA is part of the property, and during a move, it’s advisable to leave the battery in place. AEMA can increase the property’s value. The service agreement can be transferred to the new resident. If there are unpaid installments in the credit sale, they can be paid off in a lump sum.
The battery can also be moved to a new property during relocation, but in that case, the installation cost must be paid again.
For detailed moving instructions, contact Kotiakku customer service.
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Can AEMA be acquired for a housing company?
During AEMA installation, one or more penetrations are typically made into the building structure for connections. In housing company-type buildings, the owner must apply for and obtain a modification permit from the housing company before installation. The housing company may set conditions for the modification permit, which the apartment owner must consider during installation.
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What does the Beta program mean?
Beta programs are a typical way to introduce a new product or service to a limited audience. Typically, Beta programs aim to gather feedback and identify issues before broader deployment.
In the case of AEMA, during the Beta program, you can influence service development through surveys and feedback forms. We will also interview customers during the Beta period. -
Is the survey visit chargeable?
The survey visit is free of charge.
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What warranty does AEMA have?
Device Warranty: ● Battery: 15 years, with at least 60% capacity during the warranty period
● Hybrid inverter: 10 years
● Energy meter: 2 years
● Backup: 2 yearsThe installation warranty period is 2 years, and the warranty for installation materials is 6 months.
The warranty does not cover faults due to the installation site, normal wear and tear, external factors, or damages caused by misuse or incorrect use. If the fault is found to be outside the warranty, AEMA has the right to charge separately for fault investigation and repair work.
Note: The 15-year battery warranty applies only to new Huawei S1 model batteries. S0 model batteries have a 10-year warranty. -
Does AEMA need to be insured?
Discuss with your insurance company whether you need separate insurance for home batteries. Home batteries may be included in home insurance, but the compensation amount may be limited. Practices vary between insurance companies.