Solar Lease vs. PPA: What's the Difference and Which Is Better for Property Owners?

Commercial property owners exploring solar opportunities typically encounter two primary structures: roof leases and Power Purchase Agreements (PPAs). Both can provide financial benefits, but they work differently and serve different objectives.

Solar Roof Lease: Fixed Income

In a solar lease arrangement, a developer leases your rooftop space for a fixed annual payment. The developer owns, operates, and maintains the solar system, selling the generated electricity to the grid or a third party.

How It Works

• You receive fixed annual lease payments (typically $/sq ft or $/kW)
• Payments are independent of system performance
• Developer handles all installation, maintenance, and operational costs
• Lease terms typically run 20–25 years
• You retain ownership of the building and roof

Advantages for Property Owners

• Predictable income: Fixed payments regardless of weather or system output
• No performance risk: You get paid even if the system underperforms
• Simple structure: Easy to understand and account for
• Potential property value increase: Long-term contracted income can enhance appraised value

Considerations

• Lease rates vary by market—competitive bidding helps ensure market-rate terms
• Long-term commitment limits future roof flexibility
• Tax benefits (ITC, depreciation) go to the developer, not you

Power Purchase Agreement (PPA): Energy Cost Savings

In a PPA structure, the developer installs and owns the solar system on your roof, but instead of paying you rent, they sell the generated electricity to your building or tenants at a discounted rate.

How It Works

• Developer sells solar power to your building at a rate below utility prices
• You benefit from reduced electricity costs
• PPA rates often include a modest annual escalator (1–3%)
• Developer maintains the system and handles all operational costs
• Contract terms typically 15–25 years

Advantages for Property Owners

• Immediate cost savings: Lower electricity bills from day one
• Hedge against utility rate increases: Fixed or predictable PPA rates
• Sustainability benefits: Reduced carbon footprint for your building
• No capital investment: Developer funds the entire project

Considerations

• Savings depend on system performance and your actual energy consumption
• Requires alignment between solar production and your building's load profile
• More complex than a lease—requires understanding of energy markets
• May not work for buildings with low daytime occupancy or consumption

Behind-the-Meter vs. Front-of-Meter

PPAs can be structured as:

• Behind-the-meter (BtM): Power is consumed by your building or tenants, offsetting utility purchases
• Front-of-meter (grid supply): Power is sold directly to the grid, with proceeds potentially shared with you

BtM PPAs typically offer greater savings potential but require suitable load profiles. Front-of-meter arrangements function more like leases but with performance-based economics.

Which Structure Is Right for Your Property?

A Lease May Be Better If:

• You want predictable, fixed income regardless of system performance
• Your building has low energy consumption or unfavorable load profiles
• You prefer a simpler, easier-to-understand arrangement
• Your tenants pay their own utilities (triple-net leases)

A PPA May Be Better If:

• You pay for building electricity and have significant daytime consumption
• You want to reduce operating expenses and improve NOI
• You're focused on sustainability goals and carbon reduction
• Your utility rates are high and expected to rise

Hybrid Structures

Some projects combine elements of both structures—for example, a base lease payment plus additional compensation tied to system performance. Hybrid structures can offer the predictability of a lease with upside potential from strong performance.

The Importance of Competitive Bidding

Whether you pursue a lease or PPA, engaging multiple qualified developers through an RFP process helps ensure you receive competitive terms. Different developers may propose different structures based on their business models and offtake arrangements.

An owner-focused advisor can help you:

• Understand which structure aligns with your goals
• Identify developers active in your utility territory
• Compare proposals on an apples-to-apples basis
• Negotiate terms that protect your long-term interests

What the Numbers Look Like

Solar roof leases generate 100% NOI — no operating expenses. This income directly impacts property value through cap rate math. Here's an illustrative example for a 100,000 sq ft roof (~1 MW DC):

Rates are illustrative and based on market data for community solar lease structures. Actual rates depend on roof size, utility territory, interconnection costs, and developer competition.

Bottom Line

There's no one-size-fits-all answer. The optimal structure depends on your property's characteristics, energy consumption patterns, financial objectives, and risk tolerance. A thorough evaluation of both options—ideally through a competitive process—helps ensure you select the structure that maximizes value for your specific situation.