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Curtailer works in 29 countries. Each country's site shows that country's own day-ahead prices and weather.

Not listed below? Basic still works with day-ahead prices from any of them. See the full list

Other EU+ countries curtailer.eu Belgium curtailer.be Germany curtailer.de Netherlands curtailer.nl
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Free simulation tool

How much could curtailment be worth on your site?

The Curtailer pauses solar export the moment day-ahead price drops below a threshold you choose - so you stop paying to feed the grid. Pick a price limit to see how often that would have triggered on recent prices, and describe your plant for an estimated euro figure. No account needed.

Examples:
Agro-horti · 380 kWp C&I rooftop · 210 kWp Standalone · 1.2 MWp

Price limit

A curtailer pauses export when the price drops below this limit - it isn't worth feeding power to the grid below it. Defaults to €0.015 (1.5 cents), the price ANWB Energie pays for feed-in* - excluding VAT.

* The price ANWB Energie pays for feed-in, excluding VAT - your own contract's feed-in tariff may differ.

Monthly totals

kWh view: exported generation stacked with curtailed generation (the sum is gross production). EUR view: net revenue without vs. with curtailing, side by side.

Estimated net profit from curtailer

€52.50 / year

The Curtailer pays for itself in 34 months.

~108 full load hours are produced after curtailment.

Based on:

Country
Germany
Simulation window
Rolling year
System size
650 kWp
Orientation
East/West (split roof)
Price limit
€0.0150/kWh
Learn more: Disclaimer

Simulation window

Rolling year simulates the last 365 days (excluding today, often incomplete). Picking a specific year simulates that full calendar year instead.

System size

Your solar system's nameplate (peak) capacity.

Orientation

Basic mode assumes one dominant orientation at a typical roof tilt. Switch to advanced mode to describe individual strings with their own azimuth and tilt.

Detailed results

Yearly

Period Gross production Net production Curtailed
Rolling year 56.06 MWh 52.75 MWh 3.31 MWh (6%)

Results per month

Month Days Net revenue without curtailer Net revenue with curtailer Curtailed of produced
August 2025 5 €106.67 €106.67 0.0 kWh of 1.46 MWh
September 2025 30 €546.04 €552.01 541.9 kWh of 9.07 MWh
October 2025 31 €200.58 €210.52 740.8 kWh of 4.02 MWh
November 2025 30 €154.90 €156.15 211.1 kWh of 2.67 MWh
December 2025 31 €103.77 €104.48 89.5 kWh of 1.86 MWh
January 2026 31 €146.73 €146.94 15.6 kWh of 1.93 MWh
February 2026 28 €199.38 €199.38 0.0 kWh of 3.06 MWh
March 2026 31 €672.44 €680.61 680.6 kWh of 8.33 MWh
April 2026 30 €968.55 €981.58 1.03 MWh of 12.08 MWh
May 2026 26 €1.20k €1.20k 0.0 kWh of 11.59 MWh
Total 273 €4.30k €4.34k 3.31 MWh of 56.06 MWh

About this simulation

Assumptions

Weather station used
Berlin
Estimated system size
650.00 kWp
Simulation window
rolling year, 273 days with data

All simulations use weather data from Berlin - the public simulation tool doesn't yet support other locations, so results may differ from your actual site.

Based on real KNMI 10-minute weather (irradiance and temperature) for the station above, and a pvlib/PVWatts solar-position model - not a precision instrument: it uses a simplified (isotropic) sky-diffuse model, a flat system-loss allowance, and no per-module datasheet. Savings and net revenue are both netted against your price limit - as if it were the reference rate you're paid per kWh - so a negative price contributes more than a price just below the limit.

Actual solar generation, curtailment behavior, and revenue depend on your specific installation, module and inverter characteristics, shading, local grid conditions, your energy contract's terms, and future market prices - all of which may differ significantly from the assumptions used here. No rights, guarantees, or contractual commitments can be derived from any figure shown by this tool.

Read the full disclaimer

Daily curtailment statistics

On this single day you would have profited €0.00 by curtailing 0.0 kWh of the gross 633.1 kWh production.

Amber shading marks curtailed production - intervals where the price was below your limit.

Ready to put these savings to work?

Order The Curtailer for your own site - DIY install, installer install, or full service.

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