PPA vs Direct Purchase vs Solar Leasing vs Roof Rental: Which Solar Model Is Right for You?

Investing in solar energy is no longer solely about meeting sustainability goals. It is also an important financial decision that can reduce operating costs, improve long-term energy security, and create additional value from underutilised roof space.

The most suitable solar model will depend on several factors, including your available capital, electricity consumption, property ownership, preferred level of involvement, and long-term business objectives.

Below is an overview of the three main solar financing models.

1. Direct Purchase — Own Your Solar System

Under a direct purchase model, you invest in and own the complete solar photovoltaic system. The system may be paid for upfront or financed through a business or green-energy loan.

As the system owner, you are entitled to the full financial benefits generated by the installation, including electricity cost savings and, where applicable, revenue from exporting excess electricity to the grid.

Key benefits:

• Full ownership and control of the solar system

• Maximum potential return on investment over the system’s lifespan

• Greater overall electricity savings over approximately 20 to 30 years

• Potential increase in the value and sustainability credentials of the property

• Flexibility to manage, upgrade or expand the system in the future

  
  

Key considerations:

• Requires a higher initial capital investment

• The system owner is responsible for maintenance, servicing and replacement costs

• System performance and financial returns depend on proper design, installation and ongoing maintenance

  
  

A professional operations and maintenance provider may be appointed to manage the system after installation.

Most suitable for:

Businesses, property owners and homeowners with sufficient capital or access to financing who want to maximise long-term financial returns and retain full ownership of the asset.

2. Power Purchase Agreement — Pay Only for the Solar Energy Used

Under a Power Purchase Agreement, or PPA, a solar provider finances, installs, owns and maintains the solar system on the customer’s premises.

Instead of purchasing the system, the customer buys the electricity generated by the solar installation at a pre-agreed rate. This rate is generally structured to be lower than the prevailing grid electricity rate, allowing the customer to enjoy immediate electricity cost savings without making an upfront capital investment.

The solar provider remains responsible for operating, monitoring and maintaining the system throughout the agreement period.

Key benefits:

• No upfront capital expenditure

• Immediate electricity cost savings

• Maintenance, monitoring and servicing are handled by the solar provider

• Reduced technical and operational responsibilities for the customer

• Solar performance risks are generally managed by the provider, subject to the terms of the agreement

• Allows businesses to adopt renewable energy while preserving capital for core operations

  
  

Key considerations:

• Requires a long-term contractual commitment, commonly ranging from 10 to 25 years

• The customer does not own the solar system during the agreement period

• Building ownership, roof condition and future redevelopment plans must be carefully considered

• Electricity pricing, system transfer arrangements and early termination conditions should be clearly reviewed before signing

  
  

Most suitable for:

Businesses that want to reduce electricity costs and achieve sustainability goals without using their own capital or taking responsibility for system maintenance.

3. Roof Rental — Generate Income from Unused Roof Space

Under a roof rental arrangement, a building owner allows a solar developer to install and operate a solar system on the property’s roof.

The solar developer typically sells the electricity generated to the grid, building tenants or another approved electricity consumer. In return, the building owner receives an agreed rental payment for the use of the roof space.

This allows property owners to generate passive income from an otherwise underutilised area without investing in or managing the solar system.

Key benefits:

• No capital investment required

• Generates passive rental income from available roof space

• Installation, maintenance and system operations are managed by the solar developer

• Supports the property’s sustainability profile without requiring direct operational involvement

• Provides an additional revenue stream for suitable commercial or industrial properties

  
  

Key considerations:

• The building owner may not receive direct electricity savings unless separately included in the agreement

• Requires a long-term commitment of the roof space

• Future roof repairs, redevelopment or building modifications may be affected

• The roof must be structurally and technically suitable for solar installation

• Access, insurance, reinstatement and maintenance responsibilities should be clearly addressed in the agreement

Most suitable for:

Building owners, landlords and property investors who have suitable unused roof space and want to generate additional income without investing in or operating a solar system.

Selecting the Right Solar Model

There is no single solar financing model that is suitable for every property or business.

The right approach should be determined by considering:

• Available capital and financing capacity

• Current and projected electricity consumption

• Property and roof ownership

• Expected duration of occupancy

• Desired level of asset ownership and control

• Maintenance and operational preferences

• Long-term savings, income and sustainability objectives

  
  

Direct purchase generally provides the highest potential long-term returns, while a PPA allows businesses to enjoy immediate savings without upfront investment. Roof rental is more suitable for property owners who prefer to generate passive income from their available roof space.

Solar energy is no longer simply an environmental decision. When structured correctly, it can become a valuable financial strategy that reduces operating costs, creates new revenue opportunities and supports long-term business resilience.