How is a large-scale solar PV plant built? From site preparation to grid connection
When we see a completed solar PV plant, the first thing that catches our attention is its thousands of solar panels. However, before the first module produces electricity, months of planning, engineering, logistics and construction take place behind the scenes, alongside the coordinated work of professionals from many different disciplines.
But where does the construction of a solar plant begin? How long can construction take? How many people are involved? And what happens if it rains during construction?
Where does the construction of a solar PV plant begin?
Before any machinery arrives on site, the project has already undergone significant engineering and planning work. The plant layout needs to be defined, construction activities organised, suppliers coordinated and the arrival of the main equipment and materials prepared.
Once on site, the process may begin with site preparation, access roads and drainage, followed by foundations or pile driving, structures and trackers, electrical installations and module installation.
Different activities can take place simultaneously in different areas of the plant. And installing the final panel does not mean the work is finished: checks, testing, energisation and commissioning still need to take place before electricity generation can begin.
Which professionals are involved in building a solar plant?
A large-scale solar PV plant requires a much wider range of professional profiles than those involved solely in installing panels.
A project may involve professionals from civil, electrical and mechanical engineering, construction, surveying, procurement and logistics, quality, environment, health and safety, planning, project management, administration and finance, alongside technicians, operatives and specialist contractors.
The number varies depending on the size and stage of construction. On the largest projects, periods of peak activity can involve hundreds of professionals across direct and indirect employment.
How long does it take to build a solar PV plant?
There is no single answer.
The duration depends on factors such as the project's capacity and surface area, site characteristics, associated electrical infrastructure, material availability, logistics, weather conditions and site-specific requirements.
Rather than establishing a number of months that applies to every plant, it is better to think of each project as having its own schedule, with numerous activities progressing in a coordinated way.
And the larger the installation, the more important this coordination becomes: components, machinery, suppliers and teams need to arrive at the right place at the right time.
How does the weather affect construction?
Although a solar PV plant is built precisely to harness sunlight, construction teams have to deal with many other weather conditions during the building process.
Rain, wind, extreme temperatures and ground conditions can affect certain activities. Heavy rain, for example, can alter ground conditions and temporarily make it difficult for machinery to move around the site or for certain civil works to be carried out. Wind can also affect operations involving the handling of large components or the use of specific machinery.
This does not necessarily mean that the entire project stops when the weather is poor. The impact depends on the type of work being carried out, its location and, above all, whether suitable conditions are in place to work safely and to the required quality standards.
How many panels can a large solar plant have?
It depends on the project's capacity and the characteristics of the modules used.
As a real-world example, Arco 8, a 62 MWp plant built by Solarig in Seville, has more than 102,000 solar PV modules. An installation of this size covers more than 100 hectares.
Another example is the Colón plant in Huelva, with 21.03 MWp and 32,032 solar modules installed on single-row and dual-row trackers.
These figures help illustrate the scale of the logistical challenge: it is not simply a matter of installing panels, but of transporting, storing, distributing and installing tens of thousands of components according to a precise schedule.
Arco 8 · Seville
solar PV modules · 62 MWp · more than 100 hectares
Colón · Huelva
solar modules · 21.03 MWp · single-row and dual-row trackers
What happens once the final panel has been installed?
The plant is not yet complete. Before it can enter operation, the equipment and systems need to be checked, the corresponding tests carried out, and the energisation and commissioning processes completed.
This is when a construction project made up of thousands of components becomes an energy infrastructure ready to generate renewable electricity for decades.
From a plot of land to energy infrastructure
There is much more behind a large-scale solar PV plant than solar panels. Engineering, planning, logistics, construction, quality, safety and numerous professional teams need to work together to transform a project on paper into energy infrastructure.
Solarig has more than 1.6 GW of connected solar projects, with experience spanning the development and construction of large-scale solar PV installations across different markets.
Experience gained through large-scale solar PV installations across different markets.
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