According to the company, the project is part of the national plan for the stability and electrification of the energy system.
Key Project Details
Owner: PALIOLIVADA STORAGE S.A. (100% subsidiary of Principia Services SA)
Location: Mount Halkidiki (Polygyros)
Commercial Name: Themelio
Power Capacity: 49 MW
Installed Capacity: 127.04 MWh
Guaranteed Capacity: 98 MWh (2-hour duration)
Technical Specifications:
26 Battery Containers manufactured by Sungrow (China)
Each Battery Container has a maximum capacity of 5,015 kWh and is equipped with CALB – 314Ah cells
13 Sungrow production substations
Substations include 13 power transformers rated at 5,140 kW & 13 medium-voltage 33 kV switchboards
2 terminal (main station) Medium Voltage Substations
Construction Period: April – October 2025 – Completion within a record time
Expected Commercial Operation: December 2025
Budget: €28 million
Financing: 50% Project Finance (Eurobank) – 50% own funds
Safety: Zero accidents over more than 20,000 man-hours of work
Strategic Importance for Principia
The first operational BESS unit in Principia’s portfolio and one of the country’s pioneering BESS projects
The project bears the symbolic name "Themelio" (Foundation), highlighting its role as the company’s foundational step in energy storage
Enhances Principia’s technological diversification and adaptability in a more flexible and demanding energy landscape
Reinforces the company’s commitment to energy innovation and sustainable investments, focusing on energy storage—a key element for maximizing the value of renewable energy sources (RES)
Benefits for the System & Market
Reduction of power curtailments from wind and photovoltaic installations, especially in network-saturated areas
Enhancement of electrical system stability by supplying power during peak periods and absorbing excess RES production
Promotion of energy decentralization through the development of storage projects near RES generation points
The completion of the "Themelio" project demonstrates Principia’s operational capability and technical expertise. It also sends a strong message to the market and regulators that the energy transition can be achieved rapidly, safely, and with technological excellence.
