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🇫🇮 Solar Calculator Finland

Enter your monthly electricity bill and city — get honest Finnish solar yield (700–900 kWh/kWp), dark winter warning, Kotitalousvähennys 40% labor tax credit, net metering savings, and payback period.

Your electricity details
€EUR
Solar system results — Finland
6 kWp system — 788 kWh/kWp/yr
Dark winter warning: November–February production is near zero across all of Finland. Annual production of 788 kWh/kWp is concentrated in April–September (midnight sun!). Plan your energy storage and grid dependency accordingly.
Monthly kWh usage667 kWh/mo
Annual solar production4 730 kWh/yr
Self-consumption savings€298/yr
Net metering export savings€553/yr
Total annual benefit€851/yr
System cost range€6 000 – €8 400
Kotitalousvähennys tax credit (40% of labor)-€1 152
Net cost after tax credit€6 048
Payback period7.1 years
25-year net savings€15 239
Kotitalousvähennys: Finland's household tax credit covers 40% of labor costs for solar installation (max €3,500/person). Claim on your annual Veroilmoitus (tax return). Requires a VAT-registered installer's invoice itemizing labor separately.
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How to Use This Calculator

Enter your monthly bill and city

Enter your average monthly electricity bill in Euro — including both energy and distribution (siirtomaksu) charges from your Finnish utility (Helen, Fortum, Caruna, Elenia, or others). The calculator uses Finland's average blended rate of €0.18/kWh. Select your city — Turku (2.8 PSH) and Helsinki (2.7 PSH) lead Finland's solar resource; Rovaniemi (2.0 PSH, Arctic Circle) has the country's lowest useful solar hours. Finland overall produces 700–900 kWh/kWp/yr — about half of what you'd get in Portugal or Spain. Be realistic about this.

Orientation is critical at 60–70°N latitude

At Finland's high latitude, roof orientation matters more than almost anywhere else in Europe. A south-facing roof at optimal tilt (35–40°) produces 100% of theoretical output. East or west orientation reduces this by about 20%. Flat roofs should use adjustable tilt frames set to 35–40° for Finnish latitudes. If your roof faces north, solar is not recommended for primary Finnish installations.

Dark winter reality — November to February

Finnish solar production is heavily seasonal. In Helsinki, December daylight is just 6 hours at low sun angles — production is nearly zero November through February. All meaningful annual production happens April through September, including the midnight sun period (June–July in northern Finland). A battery helps shift summer afternoon production to evenings, but cannot solve the 4-month winter deficit — you will depend on the grid for heating season electricity.

The Formula

Monthly kWh = Monthly Bill ÷ €0.18/kWh (blended FI retail rate) Annual production = kWp × PSH × 365 × 0.80 efficiency × orientation factor Finland yield = 700–900 kWh/kWp/yr (vs 1,200+ in southern Europe) Self-consumption = Annual kWh × 35% (no battery) or 55% (battery) Annual savings = All kWh × €0.18/kWh (net metering at retail) System cost = kWp × €1,000–1,400/kWp Kotitalousvähennys = 40% of labor costs (40% of system cost), max €3,500 Payback = Net cost ÷ Annual benefit (typically 12–18yr in Finland)

Finland's net metering (netotus) allows households to credit exported solar against future electricity consumption within a calendar year (1-year settlement period). This is governed by the Electricity Market Act (Sähkömarkkinalaki). The Kotitalousvähennys (household tax credit) allows 40% of labor costs to be deducted directly from income tax — not just taxable income, making it a direct money-back credit up to €3,500 per person. Solar panels do not require building permits for residential rooftop installations in most Finnish municipalities, though check with your local Rakennusvalvonta for specific requirements.

Example

Mikko — Helsinki family home, 6kWp south-facing

Mikko pays €120/month for his Helsinki home. He installs a 6kWp south-facing system and claims the Kotitalousvähennys tax credit.

Monthly bill€120
City / PSHHelsinki, 2.7 PSH
System size6 kWp
OrientationSouth (optimal)
BatteryNo

Result

Annual production~4,745 kWh/yr
Production per kWp~791 kWh/kWp/yr
Total annual savings~€854/yr
System cost€6,000–8,400
Kotitalousvähennys credit-€1,176
Net cost~€6,024
Payback~7.1 years
25-year net savings~€15,326

Helsinki's 2.7 PSH gives ~791 kWh/kWp/yr — honest and realistic for Finland. The 700–900 kWh/kWp range is far below Mediterranean peers (1,200–1,600 kWh/kWp), but Finland's net metering at full retail rate and the Kotitalousvähennys tax credit make solar viable. A battery addition increases self-consumption from 35% to 55%, shortening payback by approximately 1–2 years.

FAQ

Solar is viable but requires realistic expectations. Finland produces 700–900 kWh/kWp/yr — about half of southern Europe. Payback periods of 10–15 years are typical, longer than Germany, Austria, or Switzerland. The Kotitalousvähennys (40% labor tax credit) and Finland's net metering at full retail rate help. Solar makes most sense for Helsinki, Turku, and Tampere homes with south-facing roofs. Oulu and Rovaniemi installations are significantly less productive. The Rovaniemi (2.0 PSH) example in this calculator shows honest, lower ROI — don't let installers oversell northern Finnish sites.
Kotitalousvähennys is Finland's household tax deduction for home improvement work including solar installation. You can deduct 40% of the labor portion of installation costs directly from your income taxes — this is a credit (vähennys verotuksessa), not just a deduction from taxable income, making it very valuable. Maximum credit is €3,500 per person. Requires a VAT-registered (ALV-velvollinen) installer's invoice clearly separating labor from materials. Claim on your annual Veroilmoitus tax return or via Vero.fi's OmaVero portal. Both homeowners can claim if jointly filing.
Finland's net metering (netotus/sähkön netottaminen) credits surplus solar production against your electricity consumption within a calendar year. Exported electricity earns a credit at the retail electricity price from your supplier. The settlement period is annual — meaning summer surplus offsets winter consumption. This is highly favorable compared to countries paying spot price for exports. To use net metering, you need a bidirectional (kaksisuuntainen) electricity meter installed by your local distribution network operator (DSO). Most Finnish DSOs install these free or at low cost.
Very little. In Helsinki (60°N), December solar production is typically 1–5% of July production. November, December, January, and February are effectively zero-production months. Even in March and October, output is 10–20% of peak summer. This is why Finnish annual PSH (2.0–2.8) is so much lower than the per-day summer figures suggest. Your solar system will cover essentially 0% of your heating season electricity — plan for full grid dependency from November to February. A battery helps shift summer afternoon production to evenings, but cannot address the winter deficit.
Snow coverage is a real but often overstated factor. Finnish solar panels typically shed snow naturally within 1–3 days on south-facing roofs with 35–45° tilt — the dark panel surface warms quickly when any sunlight hits it. Flat roofs are more problematic and may need occasional clearing. Snow losses account for approximately 3–5% of annual Finnish production, occurring mostly December–February when production is already near zero. Do not install solar on north-facing roofs in Finland — snow accumulation, moss, and near-zero sun angles make it unviable.

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