Commercial battery storage allows businesses and farms to store cheap electricity and use it later. With Ireland having the most expensive electricity costs in the EU so the right battery arrangement can reduce your energy bill.
How much you actually save depends on your current tariff, how you use electricity, the size of your battery, and your solar output. In this article, find out more about commercial storage in Ireland and how your site can take advantage of it.
Note: Northern Ireland follows different grants and electricity network rules.
How commercial energy storage in Ireland reduces electricity costs
The three main parts to a commercial battery storage system are:
- Batteries: Sometimes called solar batteries or storage batteries, they store electricity on your site
- Inverter: This changes DC electricity from the battery or solar panels into AC electricity your site’s equipment needs. It can also change grid electricity back into DC to charge the battery.
- Control software: This decides when the battery should charge and discharge
Together, these three parts make up a battery energy storage system, often shortened to BESS.
Your storage system is behind the meter. This means the battery supplies electricity to equipment on the business’s side of the grid connection. The battery can charge from the grid, a solar photovoltaic system, usually shortened to solar PV, or both. It does not need solar panels to work.
Batteries offer companies three different ways to reduce their electricity bills:
| Saving route | How it saves money |
|---|---|
| Shift grid electricity | Charges when electricity is cheaper and supplies the site later when it costs more. This can save money when there is a big enough gap between the two prices. |
| Store solar power | Solar battery storage lets the site store excess energy that it cannot use straight away. It can use this excess electricity later instead of buying more power from the grid. |
| Reduce demand peaks | Supplies power when electricity use rises sharply. This can reduce charges based on the site’s highest power use or delay the need for a larger grid connection. |
For example, a dairy farm could store unused solar power in the afternoon and use it for evening milking and refrigeration.
Note: Using a battery to reduce the site’s highest power use is called peak shaving.
When is battery storage worth it?
Battery storage is more likely to be a good investment where a site has:
- Cheaper and more expensive tariff periods
- Surplus solar power
- Repeated demand peaks
- Plans to add new electrical equipment
They're less likely to be a good investment if you don't use electricity and the price difference between your peak and off-peak tariffs are small.
Also, if your battery is larger than the site can regularly charge and discharge, you may end up paying for storage capacity you rarely use.
Could battery storage suit your site?
Give yourself one point for each statement that applies.
☐ We pay less for electricity at some times of day than others
☐ Our solar panels often make more electricity than we can use
☐ We still use a lot of electricity after our solar panels stop generating
☐ Our electricity use jumps at certain times of day
☐ Our bill includes a charge based on our highest power use
☐ We plan to add EV chargers, heat pumps or other electrical equipment soon
Here’s how to read your score:
- 0–2 points: A battery is unlikely to save you money
- 3–4 points: It may be worth getting your electricity data checked
- 5–7 points: Speak to an installer or energy advisor as there may be several ways to save money
Consider this as a first check only but it will give you a good indication of **whether a battery may be worth looking into for your site.
The best thing to do first is to speak to an advisor. Give them your quarterly-hour data so they can see when you use electricity and how high your peaks are. They can then work out if a battery is a worthwhile investment for your business.
How much electricity can a battery store, and how quickly can it supply it?
Battery storage capacity, measured in kilowatt hours (kWh), tells you how much electricity the battery can hold.
Inverter power, measured in kilowatts (kW), tells you how quickly it can supply that electricity.
Together, these figures show whether the battery can cover a long period of use, a short jump in demand or both.
For example, a 100 kWh battery with a 50 kW inverter could supply 50 kW for about two hours before allowing for reserves and losses.
| Measure | What it tells you |
|---|---|
| kWh | How much electricity the battery can store |
| kW | How quickly the battery and inverter can supply electricity |
What is the payback period for battery storage in Ireland?
There is no single payback period for commercial energy storage in Ireland.
First, add up the money the battery could save each year from:
- buying less electricity from the grid
- using more of your own solar power
- lowering peak charges
- earning any confirmed grid payments
Then subtract the yearly costs, including:
- electricity lost when the battery charges and discharges
- export payments given up
- software
- maintenance
- finance
Compare the amount left with the full project cost, including the battery, inverter, installation, grid connection work and controls.
Speak with an advisor to work out how long the battery could take to pay for itself.
Why how you control your battery influences how much you save
Your battery needs to charge and discharge at optimal times. If it doesn’t, it could be empty when electricity prices are higher or full when your solar panels are making more electricity than you need.
Some batteries work on a fixed schedule but the ones that save the most money operate on an active control schedule:
| Fixed schedule | Active control |
|---|---|
| Charges and discharges at set times | Updates the schedule when prices, solar output or site use changes |
| Follows the same plan each day | Uses current meter data and forecasts |
| May use stored power too early | Can hold charge for a later expensive period |
For example, a battery may charge overnight because the forecast predicts strong solar output the next day. Clouds then reduce solar generation. Active control can keep more stored electricity for the expensive evening period.
What should you check before installing a battery on-site?
Gather the following information for a potential installer:
- When the site uses electricity
- How its tariff changes through the day
- How much solar electricity it exports
- The highest short periods of demand
- How much power it may draw from or send to the electricity grid
- The proposed battery and inverter
- Planned EV chargers or other new equipment
- Whether the site needs backup during a power cut
They will then use this information to recommend the battery and inverter size, if it’s suitable for your site.
In the Republic of Ireland, ESB Networks operates the local electricity network. Your installer will also (x) with ESB Networks, including:
- How the battery, inverter and solar panels will connect to the network
- How much power the site may draw from the grid
- How much power the site may send back to the grid
- Whether ESB Networks must approve or be told about the installation
A standard grid-connected battery also switches off during a power cut. If you want it to keep some equipment running, ask your installer to add backup equipment. You’ll then need to specify which lights, machines or sockets the battery will power.
Three ways battery storage in Ireland can earn revenue from the grid
Yes, in some cases. Wind and solar generation changes through the day, so the electricity network sometimes asks businesses to use less power or supply electricity from its own battery. This is a service called demand response.
Here are three ways you can earn revenue from the grid using battery storage in Ireland:
| Route | How the site earns money | Current position |
|---|---|---|
| ESB Networks Local Business Flex | Changes electricity use or battery output during agreed periods | Proposed for the second half of 2026 |
| Capacity Market | Keeps an agreed amount of power available | In operation |
| Wholesale Single Electricity Market | Buys or sells electricity through a registered market route | In operation |
1. Earning revenue from ESB Networks Local Business Flex
ESB Networks plans to pay qualifying businesses near selected substations to reduce their grid use or discharge a battery during agreed periods. They started consulting on two proposed Local Business Flex products in April and May 2026.
The two options being weighed up are:
- SU Firm: You agree to respond on at least four days each week. The payment rate is higher, but you won’t receive any payment if your site provides less than 80% of the amount you agreed to.
- SU Flex: You agree to respond on at least two days each week. The payment rate is lower, but you receive payment for the amount of electricity you (x).
Both tariffs pay on delivery and not for making your battery available.
To qualify, you need a suitable meter, 12 months of electricity data and the ability to change its grid use or battery output by at least 2 kW.
At time of writing, ESB Networks is anticipating that it will open applications in the second half of 2026, subject to approval. It will publish the payment rates and eligible locations at the same time.
Note: A substation supplies electricity to a group of nearby homes and businesses. ESB Networks will publish the eligible locations when applications open.
2. Ireland’s Capacity Market
The Capacity Market covers Ireland and Northern Ireland. It pays businesses for keeping an agreed amount of power available when the electricity system needs it.
A battery owner must apply and offer a set amount of power at a price. If your offer is successful, you get paid for keeping that power available when the electricity system needs it.
Smaller batteries may be able to take part through a specialist provider that combines several sites into a virtual power plant, so they can offer enough power together. The provider would need to check whether your battery, meter and site meet the Capacity Market rules.
3. Wholesale trading on the island of Ireland
The Single Electricity Market is the wholesale market for the island of Ireland. It’s where approved companies buy and sell electricity in large amounts.
A commercial site can register and trade for itself, but most use an energy aggregator instead. An energy aggregator is a company that brings several batteries and sites together and trades for them. Companies use one because trading directly involves specialist rules, meter data, instructions and payments.
Grants for battery projects and solar projects in Ireland
Ireland doesn't currently have a standard grant for every standalone commercial battery. You can however get support if you install a battery at the same time as a solar project or larger energy project.
Here’s what’s available:
- SEAI energy-audit voucher: Qualifying SMEs can receive €2,000 towards an energy audit. GridVolt can refer businesses to an energy consultant.
- Non-Domestic Microgen Grant: Provides up to €162,600 towards solar PV, but does not offer a separate grant for the battery.
- TAMS 3 Solar Capital Investment Scheme: Offers eligible farmers a 60% grant rate within a separate €90,000 ceiling for qualifying solar work. An eligible battery can form part of the project.
- EXEED: May help fund a battery where it forms part of a larger approved energy project. The applicant must confirm which costs qualify.
- Community Grants: May support a battery within a qualifying community energy project. The project coordinator must confirm which work and equipment qualify.
- Accelerated Capital Allowance: Allows qualifying businesses to deduct the cost of eligible equipment from taxable profits in the year of purchase. The product must appear on the Triple E Register.
Make sure you confirm every grant and tax condition before you add it to your payback calculation.
| Support | What it covers | Battery position |
|---|---|---|
| SEAI energy-audit voucher | An energy audit for qualifying SMEs | Does not fund equipment |
| Non-Domestic Microgen Grant | Solar PV for non-domestic sites | Does not provide a separate battery grant |
| TAMS 3 Solar Capital Investment Scheme | Qualifying farm solar projects | Can include an eligible battery |
| EXEED | Larger approved energy projects | A battery may qualify within the wider project |
| Community Grants | Qualifying community projects | The coordinator must confirm eligible work |
| Accelerated Capital Allowance | Tax relief on qualifying equipment | The product must appear on the Triple E Register |
How GridVolt helps with battery storage in Ireland
GridVolt helps Irish businesses and farms save money on existing and proposed battery and battery + solar installations.
Our Energy Manager battery control software forecasts site electricity use and solar output up to 48 hours ahead. It updates the battery plan about every 15 minutes. This means it updates the battery plan as your electricity use and solar output rise and fall.
It can also work with any existing building energy management system controlling heating, lighting and ventilation.
In one commercial agricultural deployment, better control increased the savings produced by the battery by 41% during the first 70 days.
To discuss potential savings with GridVolt, send your electricity data, tariff and equipment details. We’ll then get back to you to let you know your potential savings.
Click here to get in touch or fill on the form on this page.