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🇹🇳 Solar Calculator Tunisia

Enter your monthly STEG bill and governorate — get solar system size, PROSOL government subsidy (up to 30% for ≤3kWp), STEG net metering income, and payback period.

Your electricity details
TND
Solar system results — Tunisia
5 kWp system — 1518 kWh/kWp/yr
Monthly kWh usage (est.)400 kWh/mo
Annual solar production7 592 kWh/yr
Self-consumption savingsد.ت1 025/yr
STEG net metering incomeد.ت1 253/yr
Total annual benefitد.ت2 278/yr
PROSOL subsidy (30% for ≤3kWp)Not applicable
System cost rangeد.ت20 000 – د.ت30 000
Total installed cost (midpoint)د.ت25 000
Payback period11.0 years
25-year net savingsد.ت31 940
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How to Use This Calculator

Enter your STEG bill and governorate

Enter your average monthly STEG (Société Tunisienne de l'Electricité et du Gaz) electricity bill in Tunisian dinars. The calculator uses a blended STEG retail rate of TND 0.30/kWh — actual rates are tiered from TND 0.20/kWh for low consumption to TND 0.40/kWh for high usage. Select your governorate to use accurate peak sun hours (PSH): Tozeur in the Sahara desert receives 6.2 PSH, while Bizerte in the north gets around 5.0 PSH.

Set system size and PROSOL status

Select your system size in kWp. Enable the PROSOL toggle if you plan to apply for Tunisia's government solar subsidy program — PROSOL provides up to 30% off the installed cost for residential systems up to 3kWp. The program is administered by ANME (Agence Nationale pour la Maîtrise de l'Énergie) and requires a STEG-approved installer.

STEG net metering

All surplus solar electricity is credited back to your STEG account at the retail tiered tariff under Tunisia's net metering scheme. Unlike some countries with lower feed-in tariffs, Tunisia's 1:1 retail net metering means exported kWh are as valuable as self-consumed kWh — simplifying the economics considerably.

The Formula

Monthly kWh = Monthly Bill ÷ TND 0.30/kWh (blended STEG retail) Annual production = kWp × PSH × 365 × 0.80 efficiency Self-consumption = Annual kWh × 45% Self-consumption savings = Self-consumed kWh × TND 0.30/kWh retail Net metering income = Exported kWh × TND 0.30/kWh retail PROSOL subsidy = 30% off cost for ≤3kWp residential systems System cost = kWp × TND 4,000–6,000/kWp (~USD 1,200–1,800/kWp) Payback = Total cost ÷ Annual benefit (typically 5–7 years)

Tunisia's solar regulatory framework is governed by Loi n° 2015-12 on electricity production from renewable energy. The net metering decree allows residential and commercial prosumers to offset their STEG consumption with solar generation at retail tariff rates. Tunisia's PROSOL program, launched in 2005, is one of the oldest solar subsidy programs in the Arab world and has installed over 100 MW of residential solar capacity.

Example

Ahmed — Sfax villa, 8kWp

Ahmed pays TND 200/month for his villa in Sfax. He installs an 8kWp system without PROSOL (above 3kWp limit).

Monthly billTND 200
Governorate / PSHSfax, 5.5 PSH
System size8 kWp
PROSOLNo (>3kWp)

Result

Annual production~12,876 kWh/yr
Production per kWp~1,610 kWh/kWp/yr
Self-consumption savings~TND 1,738/yr
Net metering income~TND 2,123/yr
Total annual benefit~TND 3,861/yr
System cost~TND 32,000–48,000
Payback~5.2 years
25-year net savings~TND 56,525

Sfax's 5.5 PSH yields around 1,610 kWh/kWp/yr — significantly better than most of Europe. Tunisia's full retail net metering means there's no penalty for excess production, making larger systems more viable.

FAQ

Yes — Tunisia has outstanding solar resources with 5.0–6.2 PSH across all governorates. The Saharan south (Tozeur, 6.2 PSH) is among North Africa's sunniest regions. STEG electricity prices of TND 0.20–0.40/kWh make typical residential payback 5–7 years. The PROSOL subsidy program further accelerates payback for small systems. Tunisia's net metering at full retail tariff is one of the most favorable compensation structures in the MENA region.
To apply for PROSOL: (1) Choose a STEG-registered solar installer from the ANME approved list. (2) The installer submits your application to ANME before installation. (3) ANME approves and the subsidy is applied directly to your installation cost — you pay only 70% upfront. (4) After installation, STEG connects your net metering. The PROSOL program covers residential systems up to 3kWp installed on your primary or secondary residence. Contact ANME (anme.nat.tn) for the current approved installer list and subsidy amounts.
Residential solar in Tunisia costs approximately TND 4,000–6,000 per kWp installed (~USD 1,200–1,800/kWp), depending on system size, installer, and panel brand. Larger commercial systems achieve lower per-kWp costs. With PROSOL, effective cost drops to TND 2,800–4,200/kWp for eligible systems ≤3kWp. Prices have fallen significantly since 2020 due to global panel price reductions.
Tozeur (6.2 PSH) is Tunisia's sunniest governorate, located in the Saharan south near the Algerian border. Gabès (5.6 PSH) and Sfax (5.5 PSH) are close behind. Djerba island (5.5 PSH) benefits from Mediterranean clarity. Northern coastal governorates like Bizerte (5.0 PSH) receive the least radiation but still produce excellent solar yields by global standards. Even 5.0 PSH compares to the very best solar sites in Europe.
Grid-tied solar with net metering reduces your STEG bill but does not provide backup power during outages — you remain dependent on the grid when panels aren't producing. For backup capability, add a battery storage system (e.g., 5–10kWh lithium battery). Battery costs add TND 8,000–15,000 but provide independence from any grid interruptions and can power essential loads (lighting, refrigeration, phones) during outages.

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