EPC: What is Engineering, Procurement and Construction in the renewable energy sector?
EPC stands for Engineering, Procurement and Construction, a contractual model widely used for the development of large-scale energy infrastructure, particularly in solar photovoltaic projects, wind farms, battery energy storage systems (BESS), renewable hydrogen plants and other electricity generation facilities.
Under an EPC contract, a single company assumes full responsibility for the design, supply of equipment, construction and commissioning of the facility. This means that the developer delegates the entire execution of the project to a single contractor until it is handed over in working order, thereby reducing the complexity involved in coordinating multiple independent suppliers and contractors.
Within the renewable energy sector, the EPC model has established itself as the most widely used contracting system for projects utility-scale due to its ability to centralise responsibilities, reduce risks during construction and provide greater certainty regarding costs, timescales and technical specifications.
The importance of the EPC extends far beyond the construction of a plant. The calibre of the selected contractor has a direct impact on the project’s bankability, the confidence of banks and investors, adherence to the construction schedule, and the operational performance of the facility throughout its lifespan.
In projects financed through project finance, the selection of an EPC contractor with proven experience is usually one of the requirements set by financial institutions before they grant the necessary funding for the construction of the asset.
What does Engineering, Procurement and Construction stand for?
The term ‘Engineering, Procurement and Construction’ describes the three main areas of responsibility undertaken by the contractor during the execution of the project.
• Engineering
The engineering phase encompasses the complete technical development of the facility. It includes both the basic engineering and the detailed engineering required to construct the plant in accordance with the technical specifications, current regulations and the client’s requirements. Well-developed engineering helps to minimise risks during construction, optimise costs and improve the facility’s operational efficiency. Key activities include:
- Civil, electrical and mechanical design.
- Structural calculations.
- Design of substations and transmission lines.
- Control and communications systems engineering.
- Electrical engineering.
- Optimisation of energy efficiency.
- Preparation of drawings and technical documentation.
• Procurement
The procurement phase encompasses the planning, purchase, inspection, transport and supply of all the equipment and materials required to carry out the project. The EPC contractor manages relations with manufacturers and suppliers, ensuring compliance with delivery deadlines, technical specifications and the quality standards set out in the contract. An effective procurement strategy is crucial for controlling project costs and avoiding delays caused by supply chain issues. Key supplies include:
- Photovoltaic modules.
- Investors.
- Solar trackers.
- Wind turbines.
- BESS systems.
- Transformers.
- Processing centres.
- Electrical wiring.
- Metal structures.
- Protective and control equipment.
• Construction
The construction phase involves the physical execution of all the necessary works until the facility is commissioned. The EPC contractor coordinates the civil, electrical and mechanical works, supervises health and safety, monitors the quality of the work and ensures compliance with the agreed schedule. Once all acceptance tests have been completed, the contractor hands over the facility to the developer in a condition fit for commercial operation, in accordance with the guarantees set out in the EPC contract. Typical activities include:
- Earthworks.
- Foundations.
- Assembly of structures.
- Installation of photovoltaic modules or wind turbines.
- Electrical installation.
- Construction of substations.
- Laying of evacuation lines.
- Functional tests.
- Commissioning and handover of the plant.
EPC in the renewable energy sector
The EPC (Engineering, Procurement and Construction) model has become the standard for the development of large-scale renewable energy projects. Its ability to centralise engineering, equipment procurement and construction under a single contractor helps to reduce risks, optimise coordination between the different phases of the project and ensure greater control over costs, timelines and the quality of execution.
In the renewable energy sector, EPC contracts are commonplace in the construction of solar photovoltaic plants, wind farms, battery energy storage systems (BESS), green hydrogen plants and other energy infrastructure. The EPC contractor assumes responsibility for delivering a fully operational facility, in accordance with the technical specifications, the agreed performance levels and the deadlines set out in the contract. Choosing an experienced EPC company is a key factor in the success of any project. Banks, investment funds and lenders place particular value on the contractor having a solid track record in similar projects, as this reduces the perceived risk and improves the bankability of the investment. For this reason, the selection of the EPC contractor is usually one of the most closely scrutinised aspects during due diligence and project finance processes.
As well as carrying out the construction work, many EPC companies incorporate digital technologies, BIM methodologies, advanced planning tools and quality control systems that enable each stage of the project to be optimised. This development has made the EPC model a key factor in accelerating the roll-out of renewable energy and meeting the growing demand for efficient, reliable and sustainable energy infrastructure worldwide.
