When you decide to go solar, you face a choice that is just as important as which panels or inverter to install: how do you pay for it? The three dominant models — outright purchase, solar lease, and power purchase agreement (PPA) — offer fundamentally different arrangements between you, the solar company, and the electricity grid. Getting this choice wrong can cost thousands of dollars over the life of the system.
Outright Purchase (Buy)
You pay the full system cost upfront (or via a standard loan you repay independently). You own the equipment. All financial benefits — reduced electricity bills, feed-in tariff income, rising energy prices — accrue to you.
Typical economics: A residential system costs €6,000–€15,000 fully installed depending on size and market. Payback periods of 5–9 years are common in high-irradiance markets with strong electricity prices (BloombergNEF 2025 data). After payback, you receive essentially free electricity for the remaining 20+ year panel life.
Advantages:
- Maximum long-term financial return
- No third-party dependency or contract obligations
- Freedom to optimise: add batteries, change tariffs, sell the property with the asset included
- Eligible for incentives that may not apply to leased/PPA systems
Disadvantages:
- Highest upfront commitment
- You bear maintenance risk (though panels are reliable and inverters carry 5–12 year warranties)
- Requires creditworthiness if financing via loan
Solar Lease
A solar company installs panels on your property and you pay a fixed monthly fee to use them. The company owns, monitors, and maintains the equipment. At the end of the lease term (typically 20–25 years), you may buy the system, extend the lease, or have it removed.
→ Your bill, your roof, your result — find out your solar savings now.
Typical economics: Monthly lease payments are set to be lower than your previous electricity bill at signing — generating immediate savings without upfront cost. However, lease payments often escalate annually (1–3% escalator clauses are common), and total payments over 20 years frequently exceed what outright purchase would have cost.
Advantages:
- Zero or minimal upfront cost
- Maintenance is the lessor's responsibility
- Predictable monthly costs
Disadvantages:
- You do not own the asset — resale value stays with the solar company
- Selling your home with a leased system requires buyer assumption of the lease, which can complicate sales
- Long-term cost is often higher than purchase
- Escalator clauses reduce savings as time goes on
Power Purchase Agreement (PPA)
Similar to a lease in structure: a solar company installs and owns the system on your property. But instead of a fixed monthly fee, you pay a per-kWh rate for the electricity the system actually produces — typically 10–30% below your utility rate at signing.
Typical economics: Your savings depend on the gap between the PPA rate and your utility rate over time. If utility rates rise faster than the PPA escalator, savings grow. If they do not, savings stagnate. PPAs are most financially compelling in markets with historically volatile or rapidly rising electricity prices.
Advantages:
- No upfront cost
- You pay only for what the system generates — no risk if production is lower than expected
- Can make solar accessible for properties unsuitable for system ownership
Disadvantages:
- Long-term financial return is lower than outright purchase in most modelled scenarios
- Home sale complications similar to leases
- Availability is concentrated in specific markets (US, Australia, some EU countries)
- Requires a creditworthy third party willing to underwrite the arrangement
Model Comparison Table
| Criteria | Buy (Cash) | Buy (Loan) | Lease | PPA |
|---|---|---|---|---|
| Upfront cost | High | Low | None | None |
| Equipment ownership | You | You | Solar company | Solar company |
| Maintenance responsibility | You | You | Solar company | Solar company |
| Long-term financial return | Highest | High | Moderate | Moderate |
| Incentive eligibility | Full | Full | Usually none | Usually none |
| Home sale complexity | Simple | Simple | Complex | Complex |
| Suitable for low credit | No | No | Sometimes | Sometimes |
Which Model Is Right for You?
The right choice depends on four factors: your access to capital, your credit rating, your time horizon, and your appetite for financial complexity.
Choose outright purchase if you have access to capital (cash or low-rate financing) and a long time horizon. The economics are simply better over 15–25 years.
Choose a loan-financed purchase if you lack upfront capital but have good credit. Solar-specific loans at 4–7% in many markets still produce payback periods well within the system's functional life.
→ Still unsure if the maths add up? Check your personal payback period — it takes 60 seconds.
Choose a lease or PPA if upfront cost is a genuine barrier, you have no appetite for ownership responsibility, or you rent a property (where community solar PPAs may be the only viable option).
A Note on Community Solar and Virtual PPAs
In markets where rooftop installation is not possible — renters, apartment dwellers, north-facing roofs — community solar arrangements allow you to subscribe to a share of an off-site solar farm and receive bill credits. The economics are PPA-like: you pay a per-kWh rate below the utility price. IRENA estimates community solar could serve over 30% of households that cannot otherwise access rooftop solar.