Renewable energy in Greece has moved from a supporting role to the centre of the national electricity system. Abundant sunlight, strong wind resources and falling technology costs have encouraged rapid investment, while the decline of lignite power has created space for cleaner generation. Greece now has one of Southern Europe’s most active solar markets and a substantial onshore wind sector.
The next phase will be more difficult than the first. Installing renewable capacity is no longer the only priority. Greece must also strengthen its transmission network, connect more islands, build storage and manage periods when solar and wind farms produce more electricity than the system can absorb. The country’s renewable energy transition is therefore becoming an infrastructure and market-integration project as much as a construction programme.
Solar Power Has Become Greece’s Fastest-Growing Energy Source
Greece’s climate gives solar photovoltaic projects a strong natural advantage. High levels of sunshine are available across much of the mainland, the Peloponnese, Crete and the Aegean islands. Solar farms can also be developed more quickly than large conventional power plants, making photovoltaic capacity an attractive option for utilities, independent developers, businesses and households.
IRENA recorded approximately 9.27 GW of Greek solar capacity at the end of 2024. This represented more than half of the country’s renewable generating capacity and followed a particularly rapid period of expansion. Solar capacity had more than tripled over the previous five years, while new installations during 2024 were much larger than additions in wind or hydropower.
Large projects are increasingly visible in former lignite-producing areas such as Western Macedonia. Public Power Corporation, traditionally associated with coal-fired generation, is converting parts of its portfolio toward solar, wind and storage. International energy companies and infrastructure investors have also entered the Greek market through project development, acquisitions and joint ventures.
Distributed solar is another important part of the sector. Rooftop systems, commercial installations, agricultural projects and energy communities allow electricity to be produced near the point of consumption. These systems can reduce demand on the wholesale market, although their expansion still depends on available grid capacity and predictable rules for compensation and connection.
Greece’s national energy plan expects solar to remain the largest source of renewable capacity. It projects photovoltaic capacity of about 13.5 GW by 2030, compared with 5.4 GW in the plan’s 2022 baseline. Reaching that level appears technically possible, but the economic value of additional solar will depend increasingly on batteries, flexible consumption and stronger connections between regions.
Wind Power Remains Essential to a Balanced Renewable Mix
Although solar is expanding faster, wind power remains one of the foundations of renewable electricity in Greece. IRENA reported approximately 5.36 GW of installed wind capacity in 2024. Wind supplied more Greek electricity than solar in 2023 because turbines generally operate for more hours during the year.
Mountain ridges and exposed coastal areas provide strong conditions for onshore wind development. Central Greece, the Peloponnese, Thrace, Evia and several Aegean islands have attracted major projects. Wind generation is especially valuable outside the midday solar peak, helping to create a more balanced production profile.
Development has nevertheless become more complicated. New wind farms may face lengthy licensing procedures, legal challenges and local concern about landscape effects, biodiversity and the concentration of projects in particular regions. Road access and transmission construction can also increase the physical footprint of projects in mountainous areas.
These issues do not remove wind from Greece’s energy strategy, but they change how future development must be managed. Better spatial planning, environmental assessment and consultation will be needed if the government is to reach its projected 8.9 GW of onshore wind capacity by 2030.
Offshore wind could eventually open another market. Greece’s long coastline and strong Aegean winds offer considerable technical potential, although deep water around many islands makes floating turbines more relevant than the fixed-bottom foundations used in shallower northern European seas. The national plan includes 1.9 GW of offshore wind capacity by 2030, but commercial delivery will depend on marine planning, grid connections, auctions, port capacity and a stable licensing system. Offshore wind may become strategically important, but it is developing from a much earlier stage than the country’s onshore wind and solar industries.
Hydropower Provides Flexibility That Solar and Wind Cannot
Hydropower receives less attention than Greece’s newer renewable projects, yet it has a valuable role in system stability. The country has roughly 3.4 GW of hydroelectric capacity, including large reservoirs and smaller plants. Annual generation varies with rainfall and reservoir conditions, but hydropower can respond more quickly to changes in electricity demand than most thermal power stations.
This flexibility becomes more important as variable renewable generation rises. Reservoir hydropower can reduce output during strong solar production and increase it when the sun sets or wind output falls. Pumped-storage projects can provide an additional service by using surplus electricity to move water to an upper reservoir and releasing it later through turbines.
There is less room for unlimited expansion than in solar power. Large dams affect river systems, land use and local communities, while changing rainfall patterns may alter water availability. Greece’s renewable strategy therefore treats hydropower primarily as a flexible system resource rather than the main source of future capacity growth.
Bioenergy, biogas and renewable heat occupy smaller positions. They may still support agricultural waste management, industrial heat and local energy systems, but they are unlikely to challenge solar or wind as the main drivers of renewable electricity expansion.
Island Connections Are Changing the Greek Electricity Map
Greece’s geography gives renewable energy development a distinctive infrastructure challenge. Many islands historically operated isolated electricity systems powered by imported oil. These systems were expensive, emissions-intensive and unable to support large amounts of variable renewable generation without additional balancing equipment.
Submarine interconnectors are gradually integrating islands with the mainland transmission system. The Cyclades interconnection has been developed in phases, while the connection of Crete represents one of the country’s largest electricity infrastructure projects. These links allow islands to receive power from the mainland, reduce oil-fired generation and export locally produced renewable electricity when conditions permit.
Interconnection also changes the scale at which island resources can be developed. A wind or solar project on an isolated island previously had to match the limited size and demand profile of that local system. Once connected, it can participate in the wider Greek market.
The process is not simply a route to unrestricted construction. Island landscapes, tourism, ecosystems and limited land create strong reasons for careful project selection. Hybrid systems combining renewables with batteries or pumped storage may be more suitable for some smaller islands than large export-focused developments.
Further connections will also improve energy security during periods of high summer demand. Tourism, air conditioning and water treatment place seasonal pressure on island electricity systems, often at the same time that solar resources are strongest.
Curtailment and Storage Now Define the Next Stage
Greece had approximately 18.23 GW of renewable capacity in 2024, accounting for about two-thirds of total installed electricity capacity. Renewable generation reached nearly half of national electricity output in 2023, and the transmission operator reported another annual production record in 2025.
This success has created a new operational problem. Solar and wind projects often generate at similar times. During sunny, windy periods with moderate demand, renewable supply can exceed the amount that consumers, storage facilities and transmission lines can accept. System operators may then order projects to reduce output, a process known as curtailment.
Curtailment does not mean that renewable investment has failed. It indicates that generation has expanded faster than the systems needed to move, store and use its output. However, frequent curtailment can weaken project revenues and make new financing more difficult.
Battery storage can move solar production from midday into the evening, while pumped hydropower can provide longer-duration flexibility. Demand response can encourage industrial and commercial users to consume electricity when renewable supply is abundant. Electric vehicles, heat pumps and future hydrogen production may eventually add further flexible demand.
Transmission expansion is equally important. Greece is strengthening internal networks and electricity links with neighbouring countries, including Italy, Bulgaria, Albania, North Macedonia and Turkey. Greater cross-border capacity would allow surplus renewable power to reach regional markets while giving Greece access to imports when domestic output is low.
Greece’s 2030 Target Depends on the Whole Electricity System
Greece’s revised national plan expects renewables to provide approximately 81% of net domestic electricity generation by 2030. It anticipates 13.5 GW of solar, 8.9 GW of onshore wind, 1.9 GW of offshore wind and more than 3 GW of hydropower.
The central question is no longer whether Greece can attract renewable projects. Its solar and wind resources, established developers and access to European finance have already created a large investment pipeline. The decisive issue is whether networks, storage, permitting and electricity demand can develop at a comparable speed.
Successful integration would reduce exposure to imported fossil fuels, support the retirement of lignite generation and give Greece a stronger role in regional electricity trade. Delayed grids or storage would produce a different result: more installed capacity, but also greater curtailment and weaker returns.
Greece’s renewable energy future will therefore be determined by coordination. Solar panels and wind turbines can be built relatively quickly. The national system around them must now catch up.
