A buyer of solar panels asks: is the installed price shown before a quote request, how long is the warranty on the panels, does a survey visit cost anything and are the financing terms shown. These decide 50 points out of a hundred.
solarum.fi · Solarum Suomi Oy is an independent domestic electrical contracting company founded in 2019 (CEO Antti Tahkola, registered office Liminka/Oulunsalo) with no known parent company; installs as a turnkey delivery across Finland.
81.2SCORE
Installed price is shown100
Longest published warranty100
Survey free of charge0
Financing displayed100
Basic metrics · 78.5
Digital quality64
Transparency100
Reachability65
AI quality score81
+ Prices and financing options are clearly shown on the front page (6500–8463 € installed, 120 €/month financing), which makes it easier for the customer to decide.
Basic metrics: 78.5, rank 1 · no change
– Free survey: The page mentions a needs survey but does not say whether it is free. Checked the front page, the price page and the installation price page.
lampopartio.fi · Lämpöpartio Oy is an independent domestic energy renovation company founded in 2011 (CEO Vesa Malmberg), based in Kokkola with offices in Helsinki, Jyväskylä and Oulu; over 12,500 energy renovations.
78.5SCORE
Installed price is shown100
Longest published warranty83
Survey free of charge100
Financing displayed50
Basic metrics · 69.6
Digital quality61
Transparency72
Reachability68
AI quality score80
+ Pricing presented clearly with three concrete examples of system size (8,500-15,000 euros)
aurinkotekniikka.fi · Sales under the Aurinkotekniikka brand are handled by Aurinkotekniikka Myynti Oy (3428090-1) and installations by the sister company AurinkoPro Oy (2758891-6, formerly Suomen Aurinkotekniikka Oy, name change 30 October 2025); a Finnish group, over 5000 installed systems and Helen's sales and installation partner for consumer solar power plants, RISK: AurinkoPro's turnover fell in 2024 by approx. 80% (1.3 M€, result -233 k€), financial situation worth assessing.
76.5SCORE
Installed price is shown100
Longest published warranty100
Survey free of charge0
Financing displayed100
Basic metrics · 69.0
Digital quality63
Transparency62
Reachability80
AI quality score77
+ A clear 5-step installation process described in detail for households
Basic metrics: 69.0, rank 6 · ▲ 3 places
– Free survey: The survey price is not stated on the panel page, the financing page or the warranty FAQ; the site directs users to request a quote.
1komma5.com · 1KOMMA5° Suomi is legally Solar Age Oy (founded 2016, Kaarina/Turku), the majority of which was bought by the German 1KOMMA5° GmbH in October 2022; founders Ricardo Pacheco and Pasi and Petri Seppälä; service areas Southwest Finland, Uusimaa and Pirkanmaa.
69.2SCORE
Installed price is shown0
Longest published warranty100
Survey free of charge100
Financing displayed100
Basic metrics · 78.5
Digital quality56
Transparency90
Reachability85
AI quality score82
+ Broad price information: with savings examples (600-1900 euros per year) and a concrete payback period (6-10 years), easy to compare
Basic metrics: 78.5, rank 2 · ▼ 2 places
– Installed price shown: An installed price or price range was not found on the front page or the solar panels page; the site advises getting in touch.
energio.fi · Energio Finland Oy is an independent domestic company founded in 2021 (Managing Director Jarno Kautto, Raisio/Helsinki), whose own installation teams operate in Uusimaa, Southwest Finland, Pirkanmaa and Savo, and whose operations cover all of mainland Finland.
64.7SCORE
Installed price is shown100
Longest published warranty40
Survey free of charge0
Financing displayed0
Basic metrics · 78.1
Digital quality84
Transparency90
Reachability52
AI quality score77
+ Prices clearly visible on the front page: packages for 4508-5940 euros
Basic metrics: 78.1, rank 3 · ▼ 2 places
– Survey free of charge: The price of the survey is not stated on the front page or the solar panels page, only "Request a quote".
kotisienergia.fi · Kotisi Energia Nordic Oy (PRH: active, formerly Kotisi LVI Oy) is an independent Finnish solar panel sales and installation company with no known parent company.
62.7SCORE
Installed price is shown0
Longest published warranty83
Survey free of charge100
Financing displayed100
Basic metrics · 70.1
Digital quality76
Transparency60
Reachability80
AI quality score67
+ Clear financing packages by kWp size, and power ranges defined
Basic metrics: 70.1, rank 4 · ▼ 2 places
– Installed price shown: The installed price was not found on the front page, the solar panels page or the article on pricing; the site directs to request a quote.
seron.fi · Seron Oy (Tampere) is owned and run by Lauri Vepsäläinen; supplies and installs solar panels throughout Finland, NOTE: in 2025 the Consumer Ombudsman intervened in the company's pressuring home sales to the elderly (Yle 74-20171581), to be taken into account in the reliability assessment.
62.2SCORE
Installed price is shown0
Longest published warranty100
Survey free of charge100
Financing displayed100
Basic metrics · 64.4
Digital quality65
Transparency68
Reachability68
AI quality score55
+ The product range is clearly described with technical details and manufacturer information: Solarwatt panels, Fronius inverters and Seron's own home batteries
Basic metrics: 64.4, rank 7 · no change
– Installed price shown: The installed price was not found on the detached house page, the survey page or the FAQ page; the site directs visitors to book a survey.
ataurinkopaneelit.fi · At Aurinkopaneelit Oy is an independent Finnish solar power installer (PRH: active, parallel business name Kattokeisari), no known parent company; serves nationwide.
41.4SCORE
Installed price is shown0
Longest published warranty0
Survey free of charge100
Financing displayed50
Basic metrics · 58.7
Digital quality84
Transparency38
Reachability60
AI quality score52
+ Installation process clearly described in four steps via the front page section
Basic metrics: 58.7, rank 8 · no change
– Installed price shown: The price was not found on the front page or the solar panels page; the site has only seven pages.
QUESTIONCan I see the installed price before requesting a quote?
Whether the company publishes the installed price or price range of a solar panel system on its own page.
Installed price or range published = 100, no price published = 0.
20 p
Longest published warranty
QUESTIONHow long is the warranty on the panels or the installation?
Longest panel performance or product warranty or installation warranty, in years, stated by the company on its pages.
30 years or more = 100, 0 years = 0, in between directly proportional.
14 p
Survey free of charge
QUESTIONDoes the survey visit cost anything?
Whether the company states that the survey or assessment visit is free of charge.
Free survey = 100, not stated = 0.
8 p
Financing displayed
QUESTIONCan I pay in instalments, and can I see the terms in advance?
Whether the company states the terms or amounts of financing on its own page.
Terms or amount shown = 100, financing only mentioned = 50, not stated = 0.
8 p
Basic metrics
Digital quality, transparency, reachability and AI quality score
Basic metrics × 0.5
50 p
Notes
The comparison includes 8 solar panel installers. Only what the company itself says on its pages is measured: installed price, warranty, survey price and financing.
The warranty is not fully comparable: it is the longest panel or installation warranty published by the company, and the note field states what it covers. Missing information gets zero points and the reason is shown.
The prices are for systems of different sizes, so the price is not compared in euros but by whether the company states the installed price or a price range before a quote.
About this comparison
We scored 8 solar panel installers operating in Finland on 19 metrics: technical quality, transparency, reachability and AI quality. The key question: are the system price and warranties stated before you give your contact details?
The solar panel installation sector in Finland has undergone a sharp upheaval: a boom fuelled by the electricity price spike brought dozens of companies into the sector, some of which have already left. Fortum and Vattenfall ended their consumer solar services, Naps went into restructuring and the Norwegian Otovo withdrew from Finland. The comparison includes only operators whose active consumer installation sales were confirmed in July 2026, and we measure the openness of price information, process, warranties and equipment options.
What transparency means in this category
Price information or price calculator publicly displayed (25), installation progress described step by step (20), warranties and their terms stated (20), panel and inverter options described (15), business ID (Y-tunnus) displayed (10), independent review source displayed (10)
How to read the comparison correctly: Half of the points come from buyer's questions, i.e. things the buyer finds out before deciding. The other half measures how openly the company publishes its prices, terms and contact details. Clear differences in points indicate a genuine difference: one tells you the price immediately, another only after logging in. Close scores should not be read as a ranking order, because every measurement has a margin of variation. The measurement accuracy and the full calculation formula are open in the methodology.
Customer experience is brought into the assessment separately. We also collect customer feedback and customer experiences about companies through separate surveys. The survey results will be added to the overall assessment later.
The sector is in turmoil. Many well-known names have left the consumer market: Fortum and Vattenfall ended their consumer solar services, Naps went into restructuring and Otovo withdrew from Finland. The comparison includes only operators whose active installation sales were verified in July 2026.
Helen is not listed separately, because its consumer solar sales are handled by the partner Aurinkotekniikka, which is included in the comparison.
Door-to-door sales carry risks in this industry. The Consumer Ombudsman intervened in the aggressive door-to-door sales of one listed company in 2025; we state this openly on the company's page. Always compare written offers calmly.
Comparison guide
What to consider in the comparison
Based on public price information, a typical detached-house system (5-10 kWp) costs about 4,500-11,000 euros installed. Price transparency varies: some publish package prices, others price only after a site survey.
There are three kinds of warranty: the panel power warranty (up to 25-30 years), the equipment warranty (typically 10-15 years) and the installation work warranty (often only 2 years). Always compare the same kind.
Aggressive door-to-door selling occurs in the sector: the Consumer Ombudsman intervened in the door-to-door selling of one listed company in 2025. Do not sign at the door - compare written quotes at your leisure.
The inverter is the most wear-prone part of the system: its brand, warranty and replacement cost should be checked separately.
Installation work qualifies for the household tax deduction, and selling surplus electricity to the grid shortens the payback period - a good provider includes both in the quote.
How Suomen Paras assesses and scores
Every company is measured with the same public formula: half of the points come from buyer's questions and half from basic metrics, which have four pillars: technical quality, transparency, reachability and AI quality score. Ranking cannot be bought, and you can see the origin of each point on the company's profile. Read the full methodology →
Expert tips
Ask for at least three written quotes and compare system size (kWp), panel and inverter brands and warranties - not just the total price.
Check the sizing against your own consumption: an oversized system sells cheaply to the grid, while an undersized one leaves you without the savings.
Check the installer's history and who is responsible for the warranty if the installer leaves the market: the manufacturer's warranty is a different thing from the installer's promise.
Frequently asked questions
Are solar panels worth it in Finland?
On a roof facing south or southwest, a system typically produces 800-1000 kWh per year per kilowatt-peak in Southern and Central Finland. The payback period is usually 6-12 years depending on the electricity price, and the panels last 25-30 years, so yes, when correctly sized.
How much does the system cost?
Based on public prices, a smaller 4-5 kWp package costs about 4,500-6,500 euros and a larger 8-10 kWp system about 8,000-11,000 euros installed. A battery adds thousands to the price. A household deduction is available for the share of installation work.
What happens to surplus electricity?
The electricity company usually buys the surplus fed into the grid at the spot price. The compensation is clearly lower than the purchase price, so the system should be sized for your own consumption rather than for maximum output. A battery or shifting consumption to the daytime improves the self-consumption rate.
Why should you be wary of door-to-door sales?
In door-to-door sales, price comparison is not possible and the pressure to sign is high, and the Consumer Ombudsman has intervened in aggressive door-to-door selling in the industry. In home sales there is a 14-day right of cancellation, but it is easier to ask for a quotation in writing and compare it at leisure.
Are you listed and would like to rank higher?
The free pre-analysis shows every item where your company loses points and which rank fixing it is enough for. The paid analysis shows what the items are and how to fix them.
Can't find your company on the list even though it should be there? Get in touch and we will include it in the next measurement round.
