Grid Rates & Income

Rates:  The solar produces kilowatt hours ( kWh ) so its value and cost saving is tied to the Grid rate per kwh  (eg.30c/kwh) a company is paying. The higher this grid rate the higher the ROI.

Incentives: Self-consumption of all the solar energy generated will not be 100% (eg: limited weekend use) so the amount and rate the grid pays for the surplus solar adds to the ROI.   Also there are large incentives /subsidies which lead to reduction of the solar installation cost payable.

Tax Depreciation adds further to the ROI post tax.

System Design 

An Energy Efficiency audit of a business current usage and facilities may lead to instal/upgrades such as lighting ( LEDs)  plus review of energy bills will lead to  possibly reduction in demand and right-sizing of the solar system size to improve ROI.

Financing 

How the solar system is financed, be it self-financed by the business or leased or paid & owned by a third party selling the energy produced to the business impacts significantly the ROI.

Alternatively a roof owner may lease the roof to a third party for a period to own the system and sell the solar energy back to the business or its tenants.