The true cost of a solar kWh: how to calculate LCOE for your business
In a company’s budget, the cost of electricity is one of the most impactful and, above all, unpredictable variables. The continuous fluctuations of the PUN (National Single Price) make planning operational costs a constant challenge. But what if it were possible to break free from this uncertainty and produce energy at a fixed, known, and drastically lower cost for the next 25 years?
This isn’t a pipe dream; it’s the reality of solar energy. The strategic question every entrepreneur should ask is no longer just “What’s the cost of energy on my bill?” but rather “What is the true cost of producing 1 kWh autonomously on my warehouse roof?”
Let’s break down how to calculate this essential metric and why it’s a fundamental value to consider on your path to achieving energy independence.
Beyond the bill: what is LCOE, the real cost of your kWh?
When evaluating a commercial solar system, the most common mistake is to consider only the initial investment. To obtain an accurate financial figure, you must calculate the Levelized Cost of Energy (LCOE).
LCOE is a standardized index that represents the real cost of a single kWh produced by the system, considering all expenses over its useful life. It’s the parameter that allows a direct and transparent comparison between the cost of self-produced energy and grid-purchased energy.
How to calculate the cost of 1 kWh of solar power: the simplified formula
The LCOE calculation is based on a conceptually simple formula:
LCOE (€/kWh) = Total Costs (Investment + Maintenance) / Total Energy Produced
The three key variables:
- Investment Costs (CAPEX): the “turnkey” cost of the system. Includes photovoltaic modules, inverters, mounting structures, control and monitoring devices, design, installation, and all permitting/bureaucratic procedures.
- Operational Costs (OPEX): ongoing expenses to keep the system efficient (routine maintenance, module cleaning, performance monitoring, insurance, etc.).
- Total Energy Production: total kWh produced over the guaranteed lifetime (typically 25 years), driven by system size, geographic irradiance, and component efficiency.
Practical example: cost per kWh for a 100 kWp rooftop
Let’s make the numbers concrete with a realistic scenario for a company in Southern Italy.
- System: 100 kWp on an industrial roof (Southern Italy).
- Investment Cost (CAPEX): €90,000 (indicative market value).
- Operational Costs (OPEX): ~ €900/year (maintenance + insurance).
- Estimated Annual Production: 130,000 kWh.
- Useful Life: 25 years.
Let’s calculate
- Total Costs: €90.000 (CAPEX) + (€900 × 25 years OPEX) = €90.000 + €22.500 = €112.500
- Total Production: 130.000 kWh/year × 25 years = 3.250.000 kWh
- Real Cost of 1 kWh (LCOE): €112.500 / 3.250.000 kWh = €0.035/kWh
This means that for the next 25 years, every kWh produced from this company’s roof will have an all-inclusive cost of about €0.03.
Furthermore, with standard fiscal variables (depreciation and charges that reduce taxable income), it’s possible to estimate an LCOE that is about 24% lower. Lastly, the impact of special tax benefits (like the “ZES Unica” or the “MIMIT Decree for supporting self-production of renewable energy in SMEs,” etc.) would lead to an even more significant reduction in this index.
The comparison that guides the choice
Let’s compare the LCOE of self-produced energy with the cost of grid electricity (energy + charges + transmission + taxes), which for a company typically ranges between €0.15 and €0.25+ (September 2025).
| Feature | Self-Produced Energy (Solar PV) | Grid Energy |
|---|---|---|
| Cost per kWh | ~ €0.03 – €0.04 | €0.15 – €0.25+ |
| Predictability | Fixed and guaranteed for 25 years | Variable and subject to market shocks |
| Control | Total control over the asset | Dependence on suppliers and global dynamics |
From analysis to action: calculate YOUR kWh cost
Every company has a unique consumption profile and production potential. LCOE shows that investing in a solar system is not a cost, but the creation of an asset that generates energy at an incredibly low and stable price.
It’s the key step to turn energy costs from an unpredictable liability into a competitive advantage.
Contact Southenergy for a personalized analysis. Our technical team will develop a tailored plan for your company and precisely calculate the cost of your self-produced kWh, showing net savings and return on investment.
FAQ – Frequently Asked Questions
No, the example calculates the “pure” cost of the energy. Access to incentives like the tax credit for capital goods or other special tax bonuses further reduces the investment cost (CAPEX), making the final cost per kWh even lower.
The production estimate is made conservatively by expert technicians, taking into account historical solar irradiance data and the natural degradation of modules. Constant monitoring and proper maintenance are essential to ensure maximum performance at all times.
Adding energy storage increases the initial investment and therefore slightly the LCOE. However, it maximizes self-consumption by enabling evening use of solar energy and further reducing (or eliminating) grid withdrawals—often resulting in greater overall savings.
With current energy values, the payback period for a business solar system has dropped drastically, typically ranging between 3 and 6 years (indicative estimate). After this period, the energy produced becomes a net profit for the company.
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