How long should energy storage be in a Greek power system?

Considering the energy arbitrage and flexibility needs of the Greek power system, a mix of short (~2 MWh/MW) and longer (>6 MWh/MW) duration storages has been identified as optimal. In the short run, storage is primarily needed for balancing services and to a smaller degree for limited energy arbitrage.

How many storage plants are there in Greece?

Currently there are four (4) storage plants operating in Greece, two open-loop pumped-hydro storage (PHS) stations in the mainland (700 ΜW in total) and two small hybrid RES-storage stations in non-interconnected islands (just 3 MW).

Should Greece invest in energy storage facilities?

Currently there is a growing interest for investments in storage facilities in Greece. Licensed projects mostly consist of Li-ion battery energy storage systems (BESS), either stand-alone or integrated in PVs, as well as PHS facilities .

How is storage sized in CEM?

In CEM, storage is sized either assuming a predefined duration (i.e., a fixed energy-to-power ratio, , , ) or independently optimizing the power and energy capacity of system storage, assuming distinct costs for its energy and power components , , .

What is the res penetration target for the power system of Greece?

The power system of Greece is used as a case study, adopting a RES penetration target of around 60%, as foreseen in the National Energy and Climate Plan (NECP) for 2030, . The generation portfolio of the Greek system in the mid-term horizon to 2030 is well-defined in the NECP, with storage being the main asset yet to be identified.

What are the cost assumptions for the Greek power system?

Thermal and hydro unit capacities assumed for the Greek power system. Table B.4. Variable cost assumptions for thermal units and demand response services. Includes fuel costs and CO 2 emissions rights. The investment cost assumptions for BESS, PHS and OCGT investments are presented in the following Table B.5, Table B.7.