Non-Interconnected Islands
This page displays all you need to know about Non-Interconnected Islands (NIIs).
In Greece, there are 28 Non-Interconnected Power Systems (NII), including islands or clusters of islands.
As the NII Operator, we are responsible for:
- The operation and management of the electrical systems of the NIIs.
- The management of electricity production and the operation of the Electricity Market in the NIIs.
Within our scope of responsibilities:
- We apply the provisions of the NII Management Code.
- We ensure uninterrupted supply of electricity to consumers.
- We aim to maximize the penetration of Renewable Energy Sources (RES).
- We work to reduce the operating cost of Conventional Production Units.
Thermal Power Stations (~ 933 MW)
RES Stations (~ 160 MW)
Hybrid Stations (2,95 MW)
Self-Producers (~ 17 MW)
(Last update: 01/10/2024)
NII Market
Publication of billing data and monthly reports, procedures for load representatives, and NII electrical systems.
Procedure for NII load meters representation and termination of representation declarations
Load Representatives (LR) on NII Guarantee Letter Template
Load Representatives (LR) in the Small Connected System (SCS) of Crete Guarantee Letter Template
Procedure for the conclusion of Contract for the Participation of Load Representative in the NII Market
Procedure giving effect to NII Load Representative Participation Contracts
Procedure for the voluntary deactivation and termination of Load Representative Participation Agreements in the NII Market
Statistical Data on RES Stations receiving / not receiving state aid in NIIs
NII Regulatory Framework
Codes, manuals, methodologies, and emergency response plan.
NII Power Systems Operation
Maintenance schedule for thermal units and publication of daily energy scheduling data.
Daily Energy Scheduling
The purpose of the Daily Energy Scheduling (DES) is to determine, on a daily basis, the dispatch and production of energy from Dispatchable Units, ensuring secure coverage of demand in each NII system, while complying with the safety restrictions and operational rules defined in the NII Code.
Maintenance Program for NII Thermal Units
NII Systems Development Program
The reliable and uninterrupted supply of electricity to the NIIs is one of our main responsibilities as the NII Operator.
Every year, we draft a seven-year Development Program for NII Systems
Our objectives:
- Determination of the required Conventional Power Generation Units.
- Reduction of total production cost.
- Increase in the participation of Renewable Energy Sources (RES), CHP, and Hybrid Stations.
- Reduction of environmental impacts.
In this way, we ensure a stable electricity supply, protect the environment, and reduce costs.
Supervisory Systems
The SCADA-EMS system we have implemented in the Non-Interconnected Islands allows for efficient monitoring and management of electrical systems through central and local control units.
How it works:
Central Control System (CCS)
Located in Athens, coordinating all NIIs.
Local Control Systems:
- 28 Local Supervisory and Control Systems for Power Stations (LSCS-PS): in Thermal Power Plants (with two in the Kos-Kalymnos Power System).
- 39 Local Control Systems for Wind Farms (LCS-WF).
- 2 Local Control Systems for Hybrid Stations (LCS-HS).
- 80 Local Control Systems for PV Stations (LCS-PV): Applied to a selected sample of stations.
Through this network, we ensure continuous monitoring and coordination of electrical systems, enhancing the reliability and efficiency of the NIIs.