Battery calculator for businesses

Try different battery sizes and allocate use between reserve markets and spot trading. See how your assumptions change savings and revenue for your installation.

Start with an example installation

Examples set battery size and grid capacity. They are not Enfy product specifications or quotes.

Your annual estimate1,212,026 NOK

View breakdown

1. Your installation

Price area

Reference: Statnett’s 2025 capacity prices for the selected area.

Battery power

How quickly the battery can charge and deliver electricity.

Battery energy capacity

kWh

How much energy the battery can store.

Available grid capacity

Charging and delivery limit in this example. Confirm with your grid operator.

Annual electricity consumption

kWh/year

Limits how much stored energy can replace grid purchases. Market revenue is additional.

Energy retained for backup

Excluded from modelled market and spot use.

Assumed reserve duration

hours

Power is limited by available energy divided by this duration. A sizing assumption, not product qualification.

Annual solar surplus for storage

kWh/year

Solar electricity otherwise exported. Enter 0 without solar. This is surplus, not total generation.

2. Allocate battery time

Hours represent separate periods, not simultaneous sale of the same capacity. Remaining time is available for recharging and spot use.

FCR-N

hours/day

Frequency reserve. Payment for keeping power available.

aFRR up

hours/day

Automatic regulation in different hours from FCR-N.

mFRR up

hours/day

Requested regulation. The activation example uses these hours.

4 hours for recharging and spot use per day

Assumed availability and acceptance

A uniform reduction in calculated delivery. Your scenario, not a measured acceptance rate.

Assumed mFRR activation

Share of realised mFRR hours at full power. Not derived from the price data.

3. Prices and operating assumptions

Modelled capacity price for this area (NOK/MW/hour): FCR: 217.25 · AFRR: 140.48 · MFRR: 128.5

Electricity price when charging

NOK/kWh

Your assumed purchase price. Use the same tax basis as the electricity purchases you avoid.

Electricity price avoided

NOK/kWh

Assumed price during periods when the battery replaces grid purchases.

Solar export value

NOK/kWh

Foregone export receipts are deducted when solar surplus charges the battery.

mFRR activation receipts

NOK/MWh

Assumed energy settlement before recharge and other costs.

Round-trip efficiency

Share of input energy that can be delivered back after charging and discharging.

Spot and mFRR cycle budget

per day

Maximum equivalent full cycles per day shared by these two uses. FCR/aFRR cycling is not simulated.

Exchange rate

NOK/EUR

Statnett reference prices are in EUR. This rate is an assumption, not historical FX conversion.

Reserve prices relative to 2025

100% uses the reference. Try 50% to explore lower prices.

4. Costs and investment

Fee / revenue share

Deducted from capacity payments and positive activation receipts. Not an Enfy quote.

Other annual costs

NOK/year

Allow for operations, wear, grid charges and other energy settlement, including FCR/aFRR. The default is an assumption only.

Total investment, optional

NOK

Use a specific quote for simple payback. 0 hides it. Not an assumed Enfy price.

Your annual estimate

Modelled annual contribution

1,212,026 NOKper year

After shown costs, before investment, financing and tax. A scenario, not a guarantee.

Capacity payments: 880,892 NOK
FCR-N: 456,756 NOK
aFRR: 221,511 NOK
mFRR: 202,625 NOK
Activation receipts: 157,680 NOK
Energy for recharging: -52,560 NOK
Spot and solar shifting savings: 481,800 NOK
Fee / revenue share: -155,786 NOK
Other annual costs: -100,000 NOK

Power used for reserve calculation: 900 kW
Available storage capacity: 1,800 kWh
Electricity shifted for on-site use: 578,160 kWh
Modelled mFRR activation: 78.8 MWh

Reserve power is below battery nameplate power because of the grid limit, energy capacity or backup reserve.

50% of capacity prices. All other assumptions stay the same; this is not a statistical forecast.

Back to assumptions

Export your calculation with all assumptions, or take the figures to the contact form. Your message is filled in automatically and can be edited before sending.

Understanding your result

What the model includes and what needs further assessment

Capacity: available MW × historical average price × allocated hours × assumed delivery. The price average includes zeros for missing data or less than 1 MW procured. Hours allocate use; they are not specific clock times.
Activation: an assumed full-power share of mFRR hours. Recharge energy is deducted and uses free time before spot use. No extra activation is added for FCR-N or aFRR; include their energy settlement and wear in your cost allowance.
Spot: stored electricity replaces purchases in more expensive periods. Available solar surplus is prioritised when profitable, deducting foregone exports. Remaining charging uses the grid. Annual consumption, charging power, free hours, losses and a shared cycle budget limit volume.
This is a simplified annual model, not an hourly simulation of your installation. Generation profiles, demand peaks, actual state of charge, auction sequencing and technical product requirements are not modelled. Prequalification, grid connection and market agreements must be established.
Historical average prices are references, not future prices or guaranteed accepted bids. Larger installations do not automatically obtain the same prices or access. Market changes, operations and battery lifetime can materially change results.

View Statnett’s source data How reserve markets work

How to assess a battery scenario

Compare assumptions about battery size, surplus solar, market use and costs. Save one result, change an assumption and see what affects contribution most. A positive contribution before investment does not by itself establish a profitable project.

Which inputs should we use?

Use known power and energy limits, your consumption and a specific quote for investment and recurring costs. Default values are examples. Market references use 2025 data and do not predict future payments.

Can the calculator size our installation?

No. It uses simplified annual values and does not calculate peak shaving against your local tariff. It does not establish actual charge levels throughout the day, qualification or accepted bids. An offer requires a separate analysis of meter data, tariffs, operating requirements and costs.

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