Limited retrofit applications under battery charging categories
In Greece, storage project interest is stronger for new battery developments that share renewable grid connections than for adding storage to existing photovoltaic plants, reflecting a focus on operational flexibility. Applications to retrofit existing solar projects have remained limited. Under Category 11A, where batteries can charge only from the associated photovoltaic plant, developers submitted applications totalling 10 MW. Under Category 11B, which also allows charging from the electricity network, applications total somewhat more than 100 MW.
The gap between the two categories indicates that grid-charging capability improves battery economics. However, both retrofit categories remain small relative to demand for newly developed storage capacity.
Shared renewable connection points attract multi-gigawatt proposals
Applications for new battery projects using shared renewable connection points have reached around 2.5 GW. Approximately 500 MW is expected to receive connection terms in the near term. Developers are also engaging with rules that affect how batteries can be sized and operated in relation to market conditions.
Developers argue that retrofit restrictions make it difficult to align storage operation with market signals. Linking battery capacity too closely to an existing solar plant reduces the ability to optimise around hourly electricity prices, balancing markets and other flexibility revenues. The issue is particularly visible in Category 11A.
Charging constraints narrow operational scope for batteries tied to PV
A battery restricted to charging from one solar project is largely limited to shifting that plant’s generation between hours. By contrast, a grid-connected battery has a broader commercial opportunity, including charging when system prices are low independently of the associated PV plant.
The Energy Ministry has earmarked 1 GW of network capacity for storage projects sharing connections with renewable generation. A later stage is expected to alternate capacity awards between shared-connection projects and merchant standalone batteries, with another 1 GW available for each category.
Regulatory design influences how developers position batteries
The application pattern suggests developers increasingly treat batteries as independent flexibility assets rather than add-ons to solar farms. This distinction is becoming more relevant as solar penetration rises. More photovoltaic generation tends to depress prices around midday while increasing the value of electricity during the evening ramp.
A battery able to respond freely to those market signals has greater optionality than one constrained by a single generation asset. Greece’s emerging storage pipeline therefore reflects a market where access to the grid remains valuable while developers show reluctance to obtain that access at the expense of trading and operating flexibility.
