🇸🇮 Solar Calculator Slovenia

Enter your monthly electricity bill and city — get solar system size, Eco Fund (Eko sklad) subsidy, Borzen ProEko spot feed-in income, self-consumption savings, and payback period in Euro (€).

Your electricity details

Monthly electricity bill?

€EUR

City?

System size?

Eco Fund (Eko sklad) subsidy?

Solar system results — Slovenia

5 kWp system — 1022 kWh/kWp/yr

Monthly kWh usage600 kWh/mo

Annual solar production5110 kWh/yr

Self-consumption savings (€0.20/kWh)€409/yr

Borzen ProEko feed-in (~€0.06/kWh spot)€184/yr

Total annual benefit€593/yr

System cost range€5500 – €7500

Net cost (no subsidy)€6500

Payback period11.0 years

25-year net savings€8319

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How to Use This Calculator

Enter your monthly bill and city

Enter your average monthly electricity bill in Euro (€) from your Slovenian supplier — GEN-I, Petrol Energija, Elektro Ljubljana, Elektro Maribor, or another licensed retailer. The calculator uses Slovenia's average household retail rate of €0.20/kWh. Select your city to apply accurate peak sun hours: Koper on the Adriatic coast leads with 4.0 PSH; eastern cities like Maribor, Celje, and Murska Sobota average 3.6–3.7 PSH; Ljubljana and Kranj in the northwest receive the least at 3.5 PSH due to Alpine cloud cover.

Choose your system size

Select system size in kWp. Slovenian residential systems typically range from 5–8kWp. Slovenia's Eco Fund (Eko sklad) subsidy applies to systems up to 10kWp. Commercial installations: 10–15kWp. Installation costs of €1,100–1,500/kWp are among the most competitive in the Alps-Adriatic region, reflecting Slovenia's proximity to Central European panel supply chains and a mature installer market.

Eco Fund subsidy toggle

Slovenia's Eco Fund (Javni sklad RS za varstvo okolja — Eko sklad) offers non-repayable grants for residential solar installations. Grants typically cover approximately €250/kWp for systems up to 10kWp, with a maximum of €2,500 per household. Apply at ekosklad.si before purchasing equipment — post-installation applications are not accepted. The Borzen ProEko spot-price feed-in scheme (Javni poziv — public call) allows registered solar owners to sell surplus electricity at market spot prices via Borzen (the Slovenian electricity market operator). Check borzen.si for current open calls, as registration periods open periodically.

The Formula

Monthly kWh = Monthly Bill ÷ €0.20/kWh (SI avg retail rate) Annual production = kWp × PSH × 365 × 0.80 efficiency Self-consumption = Annual kWh × 40% (without battery) Self-consumption savings = Self-consumed kWh × €0.20/kWh retail Borzen ProEko feed-in = Exported kWh × ~€0.06/kWh (avg spot) Eco Fund subsidy = min(kWp × €250, €2,500) for ≤10kWp residential System cost = kWp × €1,100–1,500/kWp installed Payback = Net cost after subsidy ÷ Annual benefit

Slovenia's solar regulatory framework is governed by the Energy Act (Energetski zakon) and implemented through AGEN-RS (the Energy Agency of the Republic of Slovenia). The prosumer model under EU Directive 2019/944 allows self-consumption. The Borzen ProEko scheme (Javni poziv za odkup električne energije iz OVE) is administered by Borzen d.o.o. and operates through periodic public calls. Eko sklad grants are administered by the Slovenian Environmental Public Fund. Additionally, EU Cohesion Funds and the ReNen program (Renewable Energy and Energy Efficiency) have provided supplementary support — check the Slovenian Ministry of the Environment and Spatial Planning (mop.gov.si).

Example

Ana — Ljubljana home, 5kWp with Eco Fund

Ana pays €120/month for her Ljubljana home. She applies for the Eco Fund grant before purchasing her 5kWp system and registers with Borzen ProEko after installation.

Monthly bill€120

City / PSHLjubljana, 3.5 PSH

System size5 kWp

Eco FundEnabled

Result

Annual production~5,110 kWh/yr

Production per kWp~1,022 kWh/kWp/yr

Self-consumption savings~€409/yr

Borzen ProEko feed-in~€184/yr

Total annual benefit~€593/yr

System cost range€5,500–7,500

Eco Fund subsidy-€1,250

Net cost after subsidy~€5,250

Payback~8.9 years

25-year net savings~€8,325

Ljubljana's 3.5 PSH gives approximately 1,022 kWh/kWp/yr — solid for Central Europe. The Eco Fund subsidy reduces upfront cost meaningfully. Maximising self-consumption (by shifting energy-intensive appliances to solar hours) is critical in Slovenia where the Borzen spot rate is lower than retail — every kWh self-consumed at €0.20/kWh is worth 3x more than one exported at ~€0.06/kWh.

FAQ

Is solar worth it in Slovenia? ▼

Yes — Slovenia's moderate but consistent solar resource (3.5–4.0 PSH) combined with retail rates of ~€0.20/kWh and Eco Fund subsidies creates viable solar economics across the country. Koper (4.0 PSH) on the Adriatic is Slovenia's solar sweet spot. Payback periods of 8–12 years are typical for Ljubljana; 7–9 years for eastern cities and Koper. The key to Slovenia's solar economics is maximising self-consumption, since the Borzen spot feed-in rate (~€0.06/kWh) is significantly lower than retail.

How does the Eco Fund (Eko sklad) subsidy work? ▼

Slovenia's Eco Fund (Javni sklad RS za varstvo okolja) provides non-repayable grants for residential solar PV installations. The grant is approximately €250/kWp for systems up to 10kWp, capped at €2,500 per household. Critical: apply at ekosklad.si and receive approval before purchasing any equipment — retroactive applications are rejected. After installation and grid connection, submit completion documents for grant disbursement. The Eco Fund also offers low-interest green loans (krediti za okolje) that can be combined with grants for larger investments.

What is Borzen ProEko feed-in? ▼

Borzen d.o.o. is Slovenia's electricity market operator. The ProEko scheme (also called Javni poziv — public call) allows registered renewable energy producers to sell surplus electricity at the day-ahead market spot price, rather than a fixed tariff. This means income varies with market conditions — typically €0.04–0.10/kWh depending on the season and wholesale market. To participate, register your installation with AGEN-RS and apply during an open ProEko call on borzen.si. Calls open periodically; check the website for current availability.

Which Slovenian city is best for solar? ▼

Koper (4.0 PSH) on the Adriatic coast is Slovenia's sunniest location — its Mediterranean microclimate delivers significantly more annual solar radiation than the rest of the country. Murska Sobota (3.7 PSH) in the Pannonian Plain of northeastern Slovenia benefits from fewer Alpine clouds. Maribor, Celje, and Novo Mesto (3.6 PSH) are close behind. Ljubljana, Kranj, and Velenje (3.5 PSH) in the western Alps and central areas receive the least radiation due to greater cloud cover from the Alps and Dinaric mountains.

Should I maximise self-consumption in Slovenia? ▼

Absolutely. The difference between Slovenia's retail rate (~€0.20/kWh) and the Borzen spot feed-in (~€0.06/kWh) is about 3.3x. Every kWh you self-consume saves €0.20; every kWh exported earns only ~€0.06. This makes strategies to increase self-consumption — such as running dishwashers, washing machines, and EV charging during solar hours, or adding a home battery — particularly valuable in Slovenia. A home battery can increase self-consumption from ~40% to 70–80%, dramatically improving payback.

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