The electricity bill is one of the largest fixed costs for many industrial and commercial businesses. In recent years, installing photovoltaic panels for self-consumption has moved from being a cutting-edge option to a financially sound decision with demonstrable returns.
The sun does not charge a fee, equipment is getting cheaper by the year, and Spain’s regulatory framework has enormously simplified grid connection and the use of surplus energy. The time to analyse whether photovoltaic self-consumption makes sense for your business is now.
How industrial photovoltaic self-consumption works
The principle is straightforward: solar photovoltaic panels installed on the roof or on elevated structures generate electricity during daylight hours. That energy is consumed directly on the business premises, reducing or eliminating the need to purchase electricity from the grid during those hours.
The system connects to the building’s electrical installation through an inverter that transforms the direct current generated by the panels into alternating current compatible with the internal network. A metering device records both generation and consumption, and the difference between the two determines whether the business is buying from or feeding into the grid.
There are three self-consumption models:
- Without surplus (with limiter): all generated energy is consumed internally and nothing is exported to the grid. Administratively simpler.
- With surplus under compensation: excess energy is exported to the grid and financially offset against the electricity bill.
- With surplus, not under compensation: surplus is exported and sold at market price, suitable for larger installations.
For most industrial businesses, the surplus-with-compensation model is the most profitable, as it allows full use of generation without needing batteries.
Sizing for industrial use
Sizing an industrial photovoltaic installation is different from a residential one. The objectives are distinct: in a business, the goal is not to cover 100% of annual consumption, but to maximise direct self-consumption during peak solar generation hours.
The factors that determine the optimal installation size are:
- Hourly consumption profile: a business that operates Monday to Friday during daytime hours has an ideal profile for self-consumption. One that works night shifts or at weekends has much less potential for direct self-consumption.
- Available roof area: an industrial warehouse of 1,000 m2 can easily accommodate between 150 and 300 kWp of installed capacity, depending on orientation and tilt.
- Contracted power and peak consumption: to avoid oversizing, the load curve is analysed and the installation is sized to cover the base consumption during the central hours of the day.
- Solar irradiation in the area: Valencia and the Valencian Community have some of the best irradiance levels in Europe, with over 2,900 hours of sunshine per year and an average of 1,500-1,600 kWh/kWp of annual production. This makes installations in this area especially profitable compared with other regions.
A practical rule of thumb: to cover 60-70% of daytime consumption for a medium-sized industrial company, between 80 kWp and 200 kWp of installed capacity is typically needed.
Return on investment and payback
The ROI of an industrial photovoltaic installation depends on several factors: installation cost, electricity price, operating hours and surplus compensation price. But the general figures are clear.
With current electricity prices for industrial businesses (between EUR 0.12 and EUR 0.18/kWh during off-peak and peak hours), and installation costs of between EUR 500 and EUR 700/kWp for medium-sized industrial projects, typical payback periods fall between 5 and 8 years.
Taking a concrete example: a business with annual consumption of 200,000 kWh, a 100 kWp installation that produces 145,000 kWh/year with 70% direct self-consumption (101,500 kWh) and an average price of EUR 0.15/kWh, the annual electricity saving is around EUR 15,000-18,000. With an investment of EUR 60,000 (EUR 600/kWp), payback occurs in approximately 4 years.
After payback, the installation — with a guaranteed useful life of 25 years — generates net savings for more than 20 years. The cumulative return on a well-designed industrial photovoltaic installation easily exceeds 200% of the initial investment.
Incentives and grants in the Valencian Community
The support framework for photovoltaic self-consumption installations in Spain includes several mechanisms:
- Tax deductions: investments in self-consumption installations may qualify for the renewable energy investment deduction in corporate tax.
- Property tax (IBI) rebates: many municipalities, including several in the province of Valencia, offer rebates of up to 50% on property tax for the years following installation.
- MOVES subsidies and Next Generation EU funds: although programmes vary from year to year, they have historically covered between 15% and 40% of the investment in business self-consumption installations. It is advisable to check the current call for proposals at the time of the project.
- Reduced VAT: since 2023, the installation of solar panels on residential and certain commercial properties benefits from a reduced 10% VAT rate.
Combining a sound technical installation with efficient management of available grants can significantly reduce the payback period.
Grid connection: permits and regulations
One of the historical barriers to self-consumption was administrative complexity. Royal Decree 244/2019 considerably simplified the process for installations up to 100 kW, which in many cases can be resolved with a prior notification to the distribution company.
For larger installations (>100 kW), an access and connection point granted by the distribution company is required, which involves a longer process but is perfectly manageable with an authorised installer.
The standard steps are:
- Preliminary study and system design.
- Processing the access and connection permit (if applicable).
- Obtaining the municipal building permit.
- Installation and registration with the regional industry authority.
- Access contract with the distribution company and registration in the self-consumption register.
Real savings examples for businesses
Photovoltaic installations for businesses in the Valencian Community span a wide range of sectors: distribution warehouses, metalworking workshops, wineries, agro-industrial facilities, logistics centres and offices with large roof areas.
In every case, the pattern is similar: businesses that operate during daytime hours on weekdays achieve direct self-consumption of 60-80% of generation, while those with night-time or highly variable consumption profiles benefit from surplus compensation to reduce the bill during the months of highest generation.
What separates a successful project from a mediocre one is not so much the hardware — current solar panels have very similar yields across brands — but the correct sizing based on the actual consumption profile and the quality of the supporting electrical installation.
Why the electrical installer makes the difference
An industrial photovoltaic installation is not just about putting panels on the roof. It requires correct inverter system design, power cabling, protection systems, integration with the main electrical panel and, in many cases, upgrading the existing electrical installation to support the new generation.
A poorly designed installation can generate performance losses of 15-25% compared with what is theoretically achievable, or cause stability problems in the business’s internal network.
At Acoval we install electrical and photovoltaic systems for businesses in Valencia and the L’Horta region, handling the technical design, legalisation and full project follow-up. Our approach always starts from the real consumption analysis of the business, not from a one-size-fits-all solution.
If you want to find out what real savings you can achieve with a photovoltaic installation at your business, get in touch. We carry out a no-obligation study using the data from your installation and your electricity bill.
