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🇱🇰 Solar Calculator Sri Lanka

Enter your monthly electricity bill and district — get solar system size, CEB/LECO 1:1 net metering savings, tiered LKR tariff analysis, and payback period. Covers Sri Lanka's post-crisis solar adoption boom 2023–2026.

Your electricity details
₨LKR
Solar system results — Sri Lanka
3 kWp system — 1314 kWh/kWp/yr
Monthly kWh usage107 kWh/mo
Annual solar production3,942 kWh/yr
Self-consumption savings (LKR 42/kWh)₨149,008/yr
Net metering credit (1:1 retail)₨16,556/yr
Total annual benefit₨165,564/yr
System cost range₨600,000 – ₨900,000
Approx. USD cost range$1935 – $2903
Total installed cost (midpoint)₨750,000
Payback period4.5 years
25-year net savings₨3,389,100
Post-crisis solar boom: Sri Lanka's 2022 economic crisis accelerated solar adoption dramatically. Solar power reduces dependence on imported fuel for generation, cuts grid electricity bills (which rose 75% in 2022), and provides resilience against future price shocks. CEB's 1:1 net metering makes solar one of Sri Lanka's best available investments.
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How to Use This Calculator

Enter your monthly bill and district

Enter your average monthly electricity bill in Sri Lankan Rupees (LKR). Sri Lanka's CEB (Ceylon Electricity Board) uses a strongly tiered tariff: LKR 7.85/kWh for the first 30 kWh up to LKR 65/kWh above 180 kWh/month. After the 75% tariff hike of 2022 during the economic crisis, electricity bills have become a significant household expense. The blended rate for typical households is approximately LKR 42/kWh. Select your district — Jaffna (5.2 PSH) in the north is Sri Lanka's sunniest district. Trincomalee (5.0 PSH) and Anuradhapura (4.9 PSH) in the dry zone are also excellent. Colombo (4.5 PSH) and Kandy (4.4 PSH) receive less due to coastal humidity and the central hills.

Choose your utility and net metering

Sri Lanka has two main distribution utilities: CEB (Ceylon Electricity Board) covers most of the island, while LECO (Lanka Electricity Company) covers parts of Colombo and suburbs. Both offer the Net Metering (NM) scheme where surplus solar generation is exported to the grid and credited at the full retail tariff rate — a true 1:1 exchange. Apply for net metering after installation through your utility's regional office. A Smart Meter is required (supplied and installed by the utility). Sri Lanka allows net metering for systems up to 100kWp for residential and up to 100kWp for commercial under standard approval. Larger systems require PUCSL (Public Utilities Commission) approval.

Sri Lanka's solar adoption boom 2023–2026

Sri Lanka's 2022 economic crisis — which included severe foreign exchange shortages, fuel rationing, and extended power cuts — dramatically accelerated solar adoption. Households and businesses invested in solar to reduce dependence on expensive imported fossil fuel generation. Combined with the sharp electricity tariff increase, solar payback periods improved significantly. Sri Lanka has ambitious renewable energy targets: 70% of electricity from renewables by 2030, with rooftop solar playing a central role.

The Formula

Monthly kWh = Monthly Bill ÷ LKR 42/kWh (blended CEB residential tariff) Annual production = kWp × PSH × 365 × 0.80 efficiency With net metering: 90% of production credited at retail rate Without net metering: 40% self-consumed × LKR 42/kWh Net metering credit = Surplus kWh × LKR 42/kWh (1:1 at retail) System cost = kWp × LKR 200,000–300,000/kWp (~$650–1,000/kWp) Payback = Total cost ÷ Annual benefit (typically 5–8 years)

Sri Lanka's tiered tariff structure strongly penalizes high consumption — the top tier at LKR 65/kWh means heavy users save far more per kWh avoided than low users. Solar is most valuable for households and businesses consuming above 180 kWh/month, where savings per unit are highest. The net metering scheme operates on a monthly accounting period with annual reconciliation. CEB and LECO are required to provide net metering upon application; approval typically takes 4–12 weeks. Sri Lanka imposes no import duty on solar panels (Harmonized Code 8541.40), and installation services are VAT-exempt for residential systems.

Example

Priya — Colombo home, 3kWp with CEB net metering

Priya pays ₨4,500/month for electricity in her Colombo home. She installs a 3kWp system with CEB net metering.

Monthly bill₨4,500
District / PSHColombo, 4.5 PSH
System size3 kWp
Net meteringYes — CEB 1:1

Result

Annual production~3,942 kWh/yr
Production per kWp~1,314 kWh/kWp/yr
Annual benefit (net metering)~₨149,000/yr
System cost range₨600,000 – ₨900,000
Payback~5.0 years
25-year net savings~₨2,975,000

Colombo's 4.5 PSH delivers approximately 1,314 kWh/kWp/year. The 1:1 net metering scheme means nearly all production earns full retail value — LKR 42/kWh on average. The 25-year net savings of nearly LKR 3 million illustrates why Sri Lanka's solar market has grown so dramatically since the 2022 tariff reform. Jaffna-based installations achieve even better results with 5.2 PSH.

FAQ

Yes — significantly so since the 2022 electricity tariff reform. Sri Lanka's blended retail rate of ~LKR 42/kWh (top tier LKR 65/kWh) combined with 4.4–5.2 PSH and CEB/LECO's 1:1 net metering creates excellent solar economics. Payback periods of 5–8 years are typical, with 25-year savings often exceeding 3–5x the system cost. Jaffna and Trincomalee achieve the fastest paybacks. The energy security benefit of reducing dependence on diesel-fired generation is an additional national and household advantage.
Sri Lanka's net metering scheme (NM scheme) allows solar system owners to export surplus generation to the CEB or LECO grid and receive credit at the full retail tariff rate — 1 unit exported = 1 unit credited on the next bill. Credits accumulate monthly, with any end-of-year surplus settled by a payment from the utility. The scheme is available for systems up to 100kWp under a standard approval process. Apply to your regional CEB office or LECO with installation documents and commissioning certificate. A bi-directional smart meter is installed free of charge. Approval typically takes 4–12 weeks.
Jaffna (5.2 PSH) in the Northern Province is Sri Lanka's sunniest district, located in the dry zone with very low cloud cover. Trincomalee (5.0 PSH) and Anuradhapura (4.9 PSH) are also excellent, both in the dry north and north-central zones. Matara (4.8 PSH) in the south is good. Galle (4.7 PSH) benefits from consistent trade winds but some coastal cloud. Colombo (4.5 PSH) and Kandy (4.4 PSH) receive the least — Colombo due to coastal humidity and urban haze, Kandy due to the Central Hills creating cloud. All Sri Lankan districts are economically viable for solar.
Solar installation costs in Sri Lanka range from LKR 200,000 to LKR 300,000 per kWp all-in (approximately $650–1,000/kWp at current exchange rates of ~LKR 310/USD). A typical 3kWp residential system costs LKR 600,000–900,000. Most panels are imported (duty-free under HS 8541.40) — Chinese tier-1 brands (JA Solar, LONGi, Canadian Solar) dominate. Inverters from Huawei, SMA, and Growatt are common. Prices have been relatively stable since 2023. ADB and World Bank programs may offer subsidized financing for qualifying households.
Sri Lanka's key solar incentives include: 1) CEB/LECO 1:1 net metering at retail tariff rates; 2) Import duty exemption on solar panels (HS code 8541.40); 3) VAT exemption on residential solar installation services; 4) Government target of 70% renewable electricity by 2030 drives ongoing policy support. The Sri Lanka Sustainable Energy Authority (SLSEA) regulates the sector. The ADB (Asian Development Bank) and World Bank have funded programs to expand residential solar access, particularly for lower-income households. Check the SLSEA website and your utility for current incentive programs and financing options.

Related Calculators

⚡ Net Metering Calculator
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📈 Solar Savings Calculator
Estimate 25-year electricity savings from solar.
⏳ Solar Payback Calculator
Detailed payback period and ROI calculation.
🏢 Commercial Solar Calculator
Size commercial rooftop and ground-mount systems.

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