An illustrative payback calculation for a rooftop solar system on a Saudi warehouse or commercial building, with the variables that change the answer.
Rooftop solar on Saudi commercial and industrial buildings can reduce electricity bills, but the payback depends heavily on the tariff you avoid, how much of the power you consume on site and the connection rules of the utility. The example below walks through the calculation with illustrative assumptions for a warehouse with daytime cooling loads, then shows how a different tariff changes the answer. Owners of factories, schools, malls and office buildings can apply the same method to their own bills.
The situation
A logistics company owns a warehouse with a large flat roof and high daytime electricity use for cooling, lighting and handling equipment. It is considering a rooftop solar system and wants to know the simple payback before asking for detailed quotations.
Assumptions (illustrative)
- Assumed system size: 500 kilowatts peak, limited by the usable roof area after access paths and plant.
- Assumed installed cost: SAR 2,800 per kilowatt peak, including inverters, mounting and cabling.
- Assumed annual generation: 1,800 kilowatt hours per kilowatt peak after typical losses.
- Assumed share consumed on site: 90 per cent, because operations run through daylight hours.
- Assumed avoided electricity tariff: SAR 0.20 per kilowatt hour.
- Assumed annual cleaning, maintenance, monitoring and insurance: SAR 20,000.
Step 1: System cost
500 multiplied by SAR 2,800 equals SAR 1,400,000.
A structural check of the roof and any reinforcement would be added to this figure, and older roofs sometimes need waterproofing renewal before panels go on.
Step 2: Annual generation
500 multiplied by 1,800 equals 900,000 kilowatt hours.
Saudi irradiation is high, but dust and panel temperature in summer reduce what the system actually delivers.
Step 3: Energy used on site
900,000 multiplied by 90 per cent equals 810,000 kilowatt hours.
Energy exported to the grid may be credited differently or not at all, so on-site consumption is what creates most of the value.
Step 4: Annual bill saving
810,000 multiplied by SAR 0.20 equals SAR 162,000.
The saving depends on the tariff category of the building, which differs between commercial, industrial and other users.
Step 5: Net annual benefit
SAR 162,000 minus SAR 20,000 equals SAR 142,000.
Cleaning is a real recurring cost in dusty conditions and should never be left out of the model.
Step 6: Simple payback and a tariff test
SAR 1,400,000 divided by SAR 142,000 equals about 9.9 years. At an assumed tariff of SAR 0.30: 810,000 multiplied by 0.30 equals SAR 243,000, minus SAR 20,000 gives SAR 223,000, and payback falls to about 6.3 years.
A ten halala change in the tariff moves the payback by more than three years, far more than any plausible saving on equipment price.
What changes the answer
- The electricity tariff applied to the building, which is set by regulation and has changed in the past.
- Share of generation consumed on site, which falls on weekends, holidays or if operations stop at midday.
- Soiling and heat losses, which reduce output below the modelled figure if cleaning is neglected.
- Installed cost, including roof strengthening, cabling runs and connection works required by the utility.
- Inverter replacement during the system life, which should be reserved for in the cash flow.
What the numbers tell you
- The avoided tariff is the variable that matters most, so confirm it from actual bills before anything else.
- Size the system to daytime consumption rather than to the full roof area.
- Include cleaning and maintenance in the cash flow from year one, not as an afterthought.
- Check the utility connection process and the regulator's rules on small-scale solar before ordering equipment.
- For tenanted buildings, agree who owns the system and who receives the saving before installation.
Limits of this example
Every figure above is an illustrative assumption used to show the method, not a quote, valuation or market rate. Costs, rates, fees and regulations change and must be confirmed with the relevant authority, lender or supplier before you commit.
If a Vision 2030 programme or market trend is shaping your investment case, Domira can test it against real land, construction costs and local demand in the city you are considering before you commit capital.
Frequently Asked Questions
Is rooftop solar worth it in Saudi Arabia?
It can be for buildings with high daytime electricity use, such as warehouses, factories, schools and offices with large cooling loads. The payback depends on the tariff you avoid, the installed cost and how much output is consumed on site. Get an energy audit and a quotation based on your actual bills rather than a generic estimate.
Can I sell excess solar power to the grid in Saudi Arabia?
The electricity regulator has issued rules for small-scale solar installations connected to the grid, including how exported energy is treated and credited. Terms and eligibility have changed over time, so confirm the current arrangement and the application process with the Saudi Electricity Company before relying on export credits in your model.
How often do solar panels need cleaning in Saudi Arabia?
Cleaning frequency depends on location, nearby construction and dust storms. Many operators clean every few weeks and more often after sandstorms. Monitoring output lets you clean when losses justify the cost rather than on a fixed schedule, which saves water and labour while protecting generation.
Does rooftop solar need a permit in Saudi Arabia?
Grid-connected systems generally need approval and a connection process with the utility under the regulator's rules, and installers may need to be qualified. Building owners should also check structural safety and any municipal or civil defence requirements. Confirm the current steps with the utility before committing to a supplier.
Have a Property Question?
Domira can help you navigate property, financing and investment decisions in Saudi Arabia. Speak with our team for an initial consultation.
