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ENERGY SOLUTIONS IN ESTONIA

Battery and energy storage

Storage should match your consumption and objectives. We help select and integrate batteries, inverters and controls around your existing electrical system.

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To get started

  • 01Electricity consumption data
  • 02Grid connection details
  • 03Existing solar installation
  • 04Your intended use of storage
Earning through frequency reserves

Reliable power. A chance to earn extra income.

With a suitable battery and controls, your solar system may earn extra income. Frequency reserve markets pay systems to help keep the electricity grid balanced. We check your equipment and grid connection to see whether this could work for you.

With our aggregator

We have an aggregator — a service provider that controls the battery and manages market participation. We help connect your system.

With your chosen aggregator

Already have an aggregator, or prefer another one? We can build a compatible system. We check equipment and control requirements before you order.

Before starting, we check suitability, carry out required tests and agree the terms. Income changes with the market. We also agree how much battery energy to keep for backup.

Could my system qualify? ↗

Start with your objectives and consumption

Do you want to use more of your solar production, manage electricity demand or plan backup power? Each objective sets a different brief. We begin by reviewing consumption, existing generation and grid connection conditions.

We compare suitable approaches and agree the functions your system should provide. Capacity, power and project cost are determined by site data and the intended operating arrangements.

Integration with your existing installation

We review existing inverters, switchboards, metering and controls. This establishes how storage can be connected, which equipment can remain and what needs to be added.

If you need backup power, include it explicitly in the brief. We assess whether the selected solution supports operation during an outage and plan the necessary changes with the rest of the electrical installation.

An agreed scope and operating plan

You can commission system planning, engineering, equipment selection or delivery coordination with our partners. We agree the scope of metering, controls, testing and handover.

The proposal states the assumptions and functions included. Before the final selection, we review monitoring, maintenance and opportunities to retain existing equipment.

What is included in the price?

The quote lists the equipment and work included. We agree installation, setup, testing and user guidance, along with warranty, maintenance and any aggregator connection.

Your questions

Questions and answers

What should you know before ordering?

Can a battery be added to my existing solar installation?

In many cases it can, but integration depends on the existing inverter, electrical installation and required functions. We assess which equipment can remain and what needs to be added.

Will the inverter need replacing?

Not always. Some systems can use a compatible battery with the existing inverter; others may need a separate storage inverter or replacement equipment. Start by sending the inverter model or a photo of its nameplate.

Will the battery supply power during a grid outage?

Having a battery alone does not guarantee this. The complete system must be designed and connected for outage operation. If you need backup power, mention it in your first enquiry.

How do you choose battery capacity and power?

Capacity determines how much energy can be stored; power determines which loads can be supplied simultaneously. Selection follows your consumption data, existing generation and intended use.

Will battery storage pay off at my site?

This requires a site-specific assessment. Consumption timing, electricity prices, network charges, solar generation, system cost and controls all affect the result. Backup power also provides reliability value. A payback estimate requires a review of the underlying data.

How can battery storage earn revenue in frequency reserve markets?

An aggregator controls charging and discharging within agreed limits to help balance the electricity system. Depending on the market product and contract, payments may cover availability and actual regulation. Participation requires suitable equipment, controls and compliance with the relevant technical requirements.

Must I use the aggregator offered by FutureEnergy?

You can use our aggregator or choose another provider. For another aggregator, we design around their integration and control requirements. Equipment and control compatibility are checked before the final solution is agreed.

How much revenue can market participation generate?

Revenue depends on market prices, offered power, battery availability, grid connection limits and aggregator terms. Assessment includes energy costs, losses, service fees and battery wear. We prepare a site-specific estimate with its assumptions; fixed monthly income or payback is not guaranteed.

What information is needed for a quote?

Where available, send consumption data, main fuse rating and details of your solar installation and inverter. For market participation, include permitted grid import and export capacities. Describe your goals: self-consumption, demand management, backup power or market participation.

Backup power and earning potential together.

Send your system details, consumption data and permitted grid import and export capacities.

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FutureEnergy is a brand of Baltic Energy Engineering Service OÜ. For privacy enquiries, email almer@futureenergy.ee or call +372 5686 8083.

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Updated 10 October 2026.