There is no single fixed answer to this question.
The cost depends on the installation location, system design, and project scope.
On average, installing 1 kWp of solar power capacity costs between 600 and 1,500 USD, excluding VAT.
Of this, solar panel prices are typically around 400–480 USD/kWp.
Below is an approximate cost table for grid-connected rooftop solar (On-Grid Roof ) projects:
| System Capacity | Min Cost (USD/kWp) | Max Cost (USD/kWp) |
|---|---|---|
| Up to 5 kVA | 1,100 | 1,500 |
| 5–10 kVA | 1,000 | 1,400 |
| 10–20 kVA | 900 | 1,200 |
| 20–50 kVA | 800 | 1,100 |
| 50–300 kVA | 700 | 1,000 |
| 300–1,000 kVA | 700 | 900 |
| Above 1,000 kVA | 620 | 750 |
In addition to the table above, you must include the following:
Mounting structure costs
Ground leveling and excavation
Fencing and camera systems
Transformer and transmission line (ENH) costs
After adding these, ground-mounted Solar Power System projects typically cost between 800 and 980 USD/kWp.
GES cost depends not only on materials but also on installation method, engineering design, and project management.
| Factor | Share (%) |
|---|---|
| Solar panels | 65–70% |
| Project design and application | 5–10% |
| EPC company | 5–10% |
| Other costs | 10–25% |
As shown above, even for the same project, there can be a 5% price difference between a strong EPC company and a weak one.
This difference reflects the quality of engineering, level of expertise, and ability to stand behind their guarantees.
Because a Solar Power System is not just a product — it’s a project.
If it were a simple product, you wouldn’t need engineering or installation companies.
Think of it like hiring a plumber: even if two plumbers use the same materials, the one with better experience and workmanship will deliver a more reliable result.
A poorly connected pipe hidden under tiles will eventually leak and cost much more to fix later.
The same applies to solar systems:
Even with top-quality materials, poor installation or faulty design can reduce system performance — or worse, require complete reinstallation.
In some cases, it can even cause fires and destroy the entire investment.
That’s why a Solar Power System is not a commodity but an engineering project — and the EPC company’s expertise and reliability are crucial.
EPC (Engineering, Procurement, Construction) companies design, supply, and build solar power plants from start to finish.
When selecting an EPC company, investors should ensure it is a well-established, experienced, and sustainable firm.
In Türkiye, there are around 1,000 registered EPC companies,
but only about 100 are truly qualified,
and back in 2015, only about 10 companies had full technical expertise across all GES processes.
A good EPC company should have:
Proven electrical installation experience,
A solid track record in other industrial projects,
Long-term sustainability and continuity.
If you would spend time getting to know a seller before buying a 20,000 USD car,
you should be even more careful when choosing a company for a 2 million USD energy investment.
Before signing, ask:
“Where will this company be 10 years from now?”
“Will they still be around to support my system?”
In short, choose an EPC company that you can trust to be there in the long run.