The decision to approve the 2022-2031 Ten-Year Development Program (DPA) of the ESMIE was officially issued at the following link: https://www.rae.gr/apofaseis/45021/
At the same time, ADMIE’s new ten-year development plan for the years 2023-2032 was put into consultation, which includes the manager’s estimates for the country’s demand and production mix in two different scenarios, as well as its investments in the network.
RES development and margins
As emphasized, the main objective is the development of the network to be able to integrate the increased RES foreseen by the national targets. The installed capacity of RES is projected from the 9.2 GW (including 3.7 GW of the Large Hydropower Plants) which is today to exceed 20 GW.
In more detail, ADMIE states that based on the data if the existing RES facilities are calculated cumulatively together with those projects that have secured the right to be connected to the Network and the System through Definitive Connection Offers with DEDDIE and ADMIE respectively, the RES projects included in the Just Development Transition Plan (SDP) and the RES potential that emerges as a possibility in the interconnected islands (Cyclades, Crete, Dodecanese, N. Aegean) the result of about 19.5 GW of power already exceeds that recorded in the National Energy Plan and the Climate target for 2030 (15.1 GW) and approaches the target for 20 GW of RES in electricity generation as expected to be reflected in the upcoming revision of the ESEK. It is pointed out that in the above estimate the potential for the development of offshore wind farms in the next decade has not been taken into account.
Based on the above, Figure 4.7 gives the estimate of the available power margins per region for the connection of new RES Stations (in addition to existing Stations and projects that have definitive offers or connection contracts).
The evolution of the electricity generation system until the year 2030 in accordance with the provisions of the ESEK is characterized by a large penetration of RES and the withdrawal of lignite units until the end of 2028, which has been planned in the context of the new national policy for the de-lignification of the energy sector, as well as the reduction of the installed capacity of the oil plants, which are expected to cease operation on the one hand due to the high emissions of gas pollutants and the age of these units and on the other hand due to the upcoming interconnections of the islands with the interconnected system. The main characteristics of the electricity generation system until the year 2030 per energy source category according to ESEK, is illustrated in Graph 3.2.
Graph 3.4 shows the evolution of the total net electricity demand over the last 20 years and its forecast until 2032 based on the 2 scenarios that have been adopted.
Phase I, Phase II and Phase III of the Cyclades interconnection project have already been completed and Phase IV is underway. The projects of the interconnection of Crete are also in progress, which are of particular importance, due to the high loads (energy and power) of the Island and due to the rich RES potential it possesses. In particular, ADMIE implemented the Phase A project of the Crete interconnection (Crete-Peloponnisos), which was completed at the beginning of 2021.
At the same time, through the subsidiary company “ARIADNI INTERCONNECTION A.E.S.” the 2nd Phase project of the Crete interconnection (Crete-Attica) is being implemented with an estimated completion time of 2024. Finally, the ADMIE has integrated into its planning through the previous and the present DPA, the planning of the Dodecanese interconnection project and the planning of the project of connecting the islands of the North Aegean.
The important area of international interconnections includes the following new projects:
Second interconnection between Greece and Bulgaria
The project concerns the implementation of a second interconnecting line between the Systems of Greece and Bulgaria which will be carried out with an aerial interconnecting G.M. 400 kV between KYT N. Santas and Y/S Maritsa East 1. The line will have a nominal transmission capacity of 2000 MVA and will have a total length of approximately 151 km, of which approximately 30 km belong to the Greek Territory and approximately 121 km to the Bulgarian Territory.
Second Greece-Turkey Interconnection
The new interconnecting G.M. it is projected to increase transmission capacity between the two countries by 600 MW in both directions.
Second interconnection between Greece and Italy
As part of the Feasibility Study, different alternative technical solutions for the development of a new submarine interconnection between the systems of Greece and Italy are investigated in detail in order to achieve an increase in the transmission capacity between the two systems by 500 to 1000 MW, while at the same time the possibility of utilizing existing infrastructures of the of Greece-Italy interconnection which has been in operation since 2002.
The project that will be qualified is expected to be integrated in the next DPA.
Interconnection Greece – Cyprus – Israel
Greece – Egypt connection
Upgrade of Greece – North Macedonia interconnection
Second Greece-Albania interconnection
Offshore wind farms
On the occasion of the new regulatory framework of offshore wind farms, ADMIE considers that the design and development of projects for submarine interconnections should potentially have the following characteristics:
› Integrated holistic design (network-centric approach with joint project management) with optimization of benefits for the entire domestic electricity market
› Creation of a “single” electrical area of interconnections with the ESMIE and between them
› Reliable operating schemes with optimal exploitation of interconnection projects for the reliable and safe operation of the overall electrical system
› Cost-benefit analysis of all alternative topology and technology scenarios (e.g. DC / AC networks)
› Ensure scalability and interoperability by ensuring the possibility of future expansions without requiring extensive projects and high costs
› Ensuring homogeneity of technical specifications to achieve the highest levels of safety and operational reliability at the respective levels of the Transmission System
› Ensuring equal treatment of investment plans which ensures that all mature plans for the development of RES units in the island area are optimally taken into account
The program envisages the construction of 61 new lifting substations for RES producers (20/150 kV, 30/150 kV, 33/150 kV, MT/400kV) until 2032 so that their total reaches 136 from 75 today.