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🇨🇿 Solar Calculator Czech Republic

Enter your monthly electricity bill and city — get solar system size, Nová zelená úsporám (NZÚ) grant breakdown up to Kč 200,000, ČEZ/EG.D/PRE net billing income, and payback period.

Your electricity details
KčCZK
Solar system results — Czech Republic
3 kWp system — 964 kWh/kWp/yr
Monthly kWh usage538 kWh/mo
Annual solar production2 891 kWh/yr
Self-consumption rate60%
Self-consumption savingsKč 11 274/yr
Net billing income (DSO export)Kč 2 313/yr
Total annual benefitKč 13 587/yr
System cost (installed)Kč 75 000 – Kč 105 000
Battery cost (4 kWh)Kč 32 000
Gross installed costKč 122 000
NZU grant — PV-Kč 45 000
NZU grant — battery-Kč 40 000
Total NZU grant-Kč 85 000
Net cost after NZUKč 37 000
Payback period2.7 years
25-year net savingsKč 302 669
Nová zelená úsporám (NZU): Apply at novazelenausporam.cz before installation. PV grant: Kč 30,000 base + Kč 5,000/kWp (max Kč 100,000). Battery grant: Kč 10,000/kWh (max Kč 60,000 for battery). Total system cap: Kč 200,000. Pre-approval takes 4–8 weeks. Use a certified NZU contractor.
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How to Use This Calculator

Enter your bill and city

Enter your average monthly electricity bill in Czech koruna (CZK) from your supplier (ČEZ, E.ON, PRE, Innogy, or others). The calculator uses a blended retail rate of Kč 6.50/kWh including distribution charges, energy taxes, and renewable levies. Select your city — Brno (3.5 PSH) is the sunniest major Czech city; Prague and Plzeň (3.3 PSH) are close behind; Ostrava (3.2 PSH) is the least sunny due to its northern position and historically higher cloud cover.

System size and Nová zelená úsporám (NZÚ) grant

Select your system size and battery. The NZÚ Light programme provides substantial grants: Kč 30,000 base + Kč 5,000/kWp for PV (maximum Kč 100,000), plus Kč 10,000/kWh for battery storage (maximum Kč 60,000). The combined system cap is Kč 200,000. Apply at novazelenausporam.cz before your installation — pre-approval typically takes 4–8 weeks. Only certified NZÚ contractors are eligible for the grant.

Distribution operator and net billing

Select your distribution system operator (DSO): ČEZ Distribuce (central and northern Bohemia), EG.D (southern Moravia and Bohemia), or PRE Distribuce (Prague). Czech net billing (čisté fakturace) means your DSO buys surplus exported electricity at approximately spot price minus a margin — around Kč 2.00/kWh. Since retail electricity costs Kč 6.50/kWh, self-consuming your solar production is more than 3x as valuable as exporting. Maximize self-consumption with battery storage.

The Formula

Monthly kWh = Monthly Bill ÷ Kč 6.50/kWh (blended retail) Annual production = kWp × PSH/day × 365 × 0.80 efficiency Self-consumption = 40% (no battery) or 60% (with battery) Self-consumption savings = Self-kWh × Kč 6.50/kWh retail Net billing income = Exported kWh × ~Kč 2.00/kWh (spot - DSO margin) NZÚ PV grant = Kč 30,000 + Kč 5,000/kWp (max Kč 100,000) NZÚ battery grant = Kč 10,000/kWh (max Kč 60,000) NZÚ total cap = Kč 200,000 Payback = Net cost after NZÚ ÷ Annual benefit

Czech Republic uses net billing (čisté fakturace) rather than net metering. Your DSO (ČEZ, EG.D, or PRE) purchases surplus exported electricity at the hourly spot price minus a distribution margin — typically around Kč 2.00/kWh. This is set by the Energy Regulatory Office (ERÚ). Czech retail electricity at Kč 6.50/kWh includes a generation component (~Kč 2.50), distribution (~Kč 2.00), regulated charges and taxes (~Kč 2.00). VAT (DPH) of 21% applies to residential solar installations in the Czech Republic.

Example

Jana — Prague small home, 3 kWp + 4 kWh battery, NZÚ grant

Jana has a Prague terraced house and pays Kč 3,500/month. She installs 3 kWp with a 4 kWh battery and claims the NZÚ grant.

Monthly billKč 3,500
City / PSHPrague, 3.3 PSH/day
System size3 kWp
Battery4 kWh
DistributorPRE Distribuce

Result

Annual production~2,892 kWh/yr
kWh per kWp~964 kWh/kWp/yr
Self-consumption (60% with bat.)~1,735 kWh/yr
Self-consumption savings~Kč 11,280/yr
Net billing income~Kč 1,157/yr
Total annual benefit~Kč 12,437/yr
System cost (3 kWp)Kč 75,000–105,000
Battery cost (4 kWh)Kč 32,000
NZÚ PV grant-Kč 45,000
NZÚ battery grant-Kč 40,000
Net cost after NZÚ~Kč 39,000
Payback~3.1 years
25-year net savings~Kč 272,000

The NZÚ grant dramatically improves small system economics. At Kč 3–4 year payback after grants, the 3 kWp + 4 kWh battery combination with full NZÚ support is one of the best ROI scenarios in Czech solar. The standard 5 kWp + 10 kWh system approaches the NZÚ cap and takes longer to pay back.

FAQ

Yes — especially with the Nová zelená úsporám grant. Czech electricity prices of Kč 6.50/kWh combined with NZÚ support create payback periods of 4–10 years for well-designed systems. Without the grant, payback extends to 8–15 years. The Czech Republic receives 900–1,000 kWh/kWp/year, moderate for Europe but economically viable given high retail prices. Brno (3.5 PSH) and southern Moravia offer the best solar resources.
Nová zelená úsporám (NZÚ) is the Czech state subsidy programme for energy efficiency and renewables, administered by SFŽP (State Environmental Fund). For solar PV: Kč 30,000 base + Kč 5,000/kWp, maximum Kč 100,000 per household. For battery storage paired with PV: Kč 10,000/kWh, maximum Kč 60,000. The combined system cap is Kč 200,000. Applications are submitted at novazelenausporam.cz. You must use a certified NZÚ contractor and receive pre-approval before starting installation. The grant covers part of the total project cost, which must include all required documentation.
Czech net billing (čisté fakturace) replaced the older net metering system. Under net billing, surplus solar electricity you export to the grid is purchased by your DSO (ČEZ, EG.D, or PRE) at the hourly spot price minus a distribution margin — typically around Kč 1.50–2.50/kWh. This is much lower than the Kč 6.50/kWh retail price you pay for grid electricity, making self-consumption with battery storage critical for good ROI. The ERÚ (Energy Regulatory Office) regulates net billing rates.
ČEZ Distribuce covers the majority of Bohemia including central Bohemia, north Bohemia, east Bohemia, and north Moravia (including Ostrava). EG.D (formerly E.ON Distribuce) covers south Moravia (including Brno and Znojmo) and south Bohemia (including České Budějovice). PRE Distribuce covers Prague and parts of central Bohemia immediately surrounding the capital. Check your electricity bill or the distributor websites to confirm your DSO, as it determines your net billing rate and connection process.
The NZÚ grant is capped at Kč 100,000 for PV and Kč 60,000 for battery (Kč 200,000 total), so it has diminishing benefit for larger systems. For a small 3 kWp + 4 kWh system costing ~Kč 115,000 gross, the Kč 85,000 NZÚ grant covers 74% of cost — exceptional ROI. For a large 10 kWp + 10 kWh system costing ~Kč 380,000 gross, the Kč 150,000 grant covers only 39% — still significant but less transformative. The sweet spot for NZÚ economics is typically a 3–5 kWp system with a 4–5 kWh battery.

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