If you want to finance a solar system with a loan in Slovenia, the cheapest option in October 2026 is the Eko sklad loan at a fixed 2%. For a 10 kW system with a battery costing about €18,000, the payment over ten years is €169 a month, compared with about €186 for the best bank green loan. What matters more than the choice of loan, though, is the Borzen subsidy. Without it, the payment is clearly higher than the saving on the electricity bill for most households; with it, the gap shrinks a lot.
What a solar system costs
According to installers’ price lists, a 10 kW system without a battery costs about €11,000 to €14,000 including VAT and installation on a typical roof. With a battery storage unit of about 10 kWh the price is about €15,500 to €19,000. On more complex roofs, for example on several levels or where the roof structure needs reinforcing, it can be higher. Prices vary a lot between installers, so get at least two or three quotes and check what they include: inverter, installation, grid connection and registration with the distributor.
A 10 kW system in Slovenia produces about 10,000 kWh a year, depending on location, roof pitch and shading. With optimal south-facing placement that is about 1,050 kWh per kW of capacity. On an east-west or partly shaded roof it can drop below 950 kWh per kW, which means a smaller saving and a longer payback.
The Borzen subsidy
Grants for household solar systems are now awarded by Borzen, while Eko sklad offers a low-interest loan. Under Borzen’s public call JP-SO-02 you get:
| Subsidy | Maximum | For 10 kW | |
|---|---|---|---|
| With a battery | €675 per kW | 40% of eligible costs | €6,750 |
| Without a battery | €250 per kW | 25% of eligible costs | €2,500 |
The call covers systems without net metering, and the subsidy can be claimed from 1 January 2026. No end date has been published, and the funds may run out sooner. You can only apply once the installation is done, so you first have to pay for the whole investment yourself or with a loan. Before ordering, check that the call is still open and funds are still available.
Which loan to choose
For a system on an existing house there are two types of loan without a mortgage: the Eko sklad loan and a bank green consumer loan. An ordinary consumer loan is usually more expensive. A comparison for €18,000 over ten years, at a fixed rate and without the requirement to be an existing bank customer:
| Interest rate | Monthly payment incl. fees | Total repaid | |
|---|---|---|---|
| Eko sklad loan | 2.00% | €169.37 | €20,500 |
| NLB green personal loan | 4.49% | €186.46 | €22,375 |
| DH green loan | 3.80% | €184.44 | €22,402 |
| Best ordinary consumer loan as of 31 October 2026 (DBS) | 5.50% | €195.35 | €23,442 |
The Eko sklad loan under call 89OB26 is available to residents of Slovenia who do not run a business and own or co-own the building, or have the owner’s consent. The bank checks your creditworthiness, loan insurance is mandatory, and the amount ranges from €1,500 to €100,000. The call runs until the funds are used up; at publication €20 million was available.
With the Eko sklad loan you repay about €1,900 less than with the best bank green loan. For Eko sklad you also have to add one-off loan insurance, about €170 to €330 on this amount, but the saving stays at about €1,500 or more. DH does have a lower rate than NLB, but because of its approval fee you actually repay slightly more in total. That is why you should compare the APR, not just the interest rate.
Bank offers are from our green loan comparison as of 31 October 2026, where you can enter your own amount and term. How the Eko sklad loan works and what the process looks like is explained in the article on the Eko sklad loan, and bank green loans in the article on green loans.
If you are buying or building a house, you can include the solar system in the value of the investment and finance it with a mortgage. The rate is lower, but the loan is long-term and secured by a mortgage on the property, so you pay more interest in total if you repay the solar system over 20 or 30 years.
Example: Maja and Žan install solar panels
Maja and Žan have a house with a heat pump and an electric car, and use about 9,000 kWh of electricity a year. They received a quote of €18,000 for a 10 kW system with a 10 kWh battery. Because Borzen pays the subsidy only after the installation, they take an Eko sklad loan for the full amount, and once they receive the €6,750 subsidy, they use it to repay part of the loan. After a partial repayment, either the payment goes down or the term gets shorter, which they agree with the bank. The table shows the lower payment with the term unchanged.
| Before the subsidy | After the subsidy | |
|---|---|---|
| Debt | €18,000 | €11,250 |
| Monthly payment incl. fees | €169 | about €107 |
| Payments per year | €2,032 | about €1,290 |
| Own use that covers the payment (at €0.21 per kWh) | about 9,600 kWh | about 6,100 kWh |
The last row matters most. Without net metering, the system saves them as much as the share of its electricity they use themselves. Each such kWh is worth at most about €0.21, which is what households paid on average for electricity including all taxes in the second half of 2025. The real saving is lower, because part of the bill, such as the capacity-based network charge, does not go down with a solar system. If the saving is, say, €0.17 per kWh, which is our rough estimate, they would need about 7,600 kWh of own use to cover the payment after the subsidy.
Without the subsidy they would have to use almost all the electricity the system produces, which is impossible. After the subsidy they need 6,100 to 7,600 kWh of own use, so the system would have to cover two thirds or more of their consumption. With a battery the lower figure is achievable in a good year, the upper one hardly, as the system produces little in winter, when the heat pump uses the most. More likely, the payment will be somewhat higher than the saving in the first years. The surplus they sell to their supplier is paid at a much lower price, so it is only a small extra.
Without a battery the system would be cheaper, about €12,500, but the subsidy only €2,500. With an Eko sklad loan for the remaining €10,000 the payment would be €96 a month, which covers about 5,400 kWh of own use a year. Without storage, own use is lower because the system produces most at midday, when consumption at home is low, so this figure is harder to reach.
When a solar system on a loan pays off
You don’t have to compare the payment and the saving only over the life of the loan. You repay the loan in ten years, while the panels last much longer; manufacturers usually give a 25-year performance warranty. The battery will probably need replacing sooner. So if the payment is not fully covered in the first years, the investment can still pay back once the loan is repaid, you just cover part of the payment from your income until then.
The price of electricity in the coming years also matters. If electricity gets more expensive, the investment pays back faster; if it gets cheaper, the saving shrinks.
A solar system on a loan pays its way sooner if you get the subsidy and use it to repay part of the loan, if you use a lot of electricity yourself, for example with a heat pump, an electric car or working from home, and if you have a battery that shifts electricity from the day into the evening. The cheapest loan also helps, which is usually the Eko sklad loan.
It is less favourable if your consumption is low, your roof is heavily shaded, or you would finance the system with an ordinary consumer loan at over 5%. In that case it is better to install a smaller system or wait until you have saved part of the money yourself.
Financing when the subsidy comes later
The order matters. You apply for the Eko sklad loan with a quote before ordering, because the bank pays the money directly to the installer. The Borzen subsidy application, on the other hand, is filed only once the system is running.
Because the subsidy comes later, you have two options. You can take a loan for the full amount and partly repay it with the subsidy, like Maja and Žan. For fixed-rate consumer loans, the law lets the bank charge an early repayment fee only if you repay more than €10,000 within 12 months, and even then at most 1%. Repaying the €6,750 subsidy is below that threshold. Whether the same applies to the Eko sklad loan is not stated in the call, so check the contract with the bank. The other option is to cover the part of the investment equal to the subsidy from savings for a while and take a smaller loan. That way you pay lower approval fees and less interest. How partial early repayment affects the payment and term is explained in the article on early loan repayment.
Before taking a loan, also check how large a payment you can afford. The bank will count all your obligations, so use the credit capacity calculator and work out the payment for your amount and term in the loan calculator.
Summary
In October 2026 the cheapest way to finance a solar system in Slovenia is an Eko sklad loan at a fixed 2%, while bank green loans cost about 1.8 to 2.5 percentage points more. On an €18,000 system the difference over ten years is about €1,900. Even more important than the choice of loan is the Borzen subsidy, because without it the payment far exceeds the saving for most households. A solar system on a loan pays off best if you use a lot of electricity yourself and have a battery, and when weighing it up, keep in mind that the panels last much longer than the loan.
Sources
System prices are indicative ranges from installers’ public price lists (October 2026). Subsidies: Borzen, public call JP-SO-02 for systems without net metering (borzen.si). Eko sklad loan: public call 89OB26 of 28 October 2026 (ekosklad.si). Electricity price: Eurostat, household prices including all taxes, second half of 2025, consumption band 2,500 to 5,000 kWh (€0.2121/kWh). Production: about 1,050 kWh per kW with optimal placement (Faculty of Electrical Engineering, University of Ljubljana). Bank offers: FinPortal green loan comparison, 31 October 2026. The calculation methodology is on the Methodology page.
