Hydropower and Grid-Scale Batteries: Austria’s Path to 2030
How the integration of chemical batteries offers a localized and rapid-response solution to modern grid demands.
To implement its stated goal of achieving net fully renewable energy by 2030, Austria is relying on hydropower to lead the way. With this target in mind, as of 2024, sixty percent of Austria’s energy comes from hydroelectric generation. In general, hydroelectric generation involves releasing water through a dam inside which the water spins a turbine to produce electricity. Electricity supply and demand have to match at all times, so when electricity demand increases, operators let more water flow through the dam, and when electricity demand is low, operators slow or stop the flow of water through the dam altogether. Gravity, in this system, does the work of dragging the water through the dam. It sounds obvious, but when water flows from somewhere high to somewhere low, nothing needs to pump it. The same cannot be said, however, for the other direction.
Pumped hydropower storage takes hydroelectric generation up a notch, literally. Pumped hydropower means that after water flows through a dam, a pump system returns the water to a reservoir above the dam so it can flow back through repeatedly. In a traditional hydroelectric plant, water flow can be adjusted to alter dam electricity production to match demand, but in a pumped hydropower system, the pumps activate during periods of low electricity demand, allowing more water to flow down during high demand times. These pumps require electricity to operate, and thanks to the laws of physics, they require more energy than can be produced from the water that flows back down. Even so, they add an extra dimension to energy storage along with supply and demand matching that national grids, like the one in Austria, can use.
A key criticism of certain renewable sources like wind and solar is that they cannot produce electricity at all times or adjust easily to changes in demand, but pumped hydropower does not share this concern. Austria takes this advantage to the extreme, investing hundreds of billions of Euros into expanding pumped hydropower storage. Many proponents of pumped hydropower refer to these installations as “green batteries” that can store electricity in the form of water above the dam for conversion into usable grid power as soon as the need arises.
Of course, these “green batteries” cannot really generate electricity exactly as soon as the need arises for two main reasons. First, there is the issue of response time for the dam to activate or increase its flow and, if applicable, turn off the direction reversal pumps before doing so. Second, hydroelectric dams have to be where the flowing water is. Austria is lucky in this regard. The country has many mountains and strong rivers especially in its western half, so Austria can and does capitalize on this feature of its geography, but electricity generated in the west still has to flow eastward subject to capacity constraints of the electric grid.
Traditional batteries address these problems. Grid-scale batteries offer another way to store energy generated when demand is low for use when demand is high. Batteries solve two main issues. First, they can be located more conveniently and closer to demand centers. Second, their charge and discharge activation times are measured in milliseconds. There are tradeoffs, however. Batteries are noisy and prone to overheating, so their noise and fire suppression systems need to be taken into account when constructing and maintaining them. Batteries also degrade over time, with current technology allowing grid scale batteries to retain only 73% of their original capacity after a decade even with the best management practices.
Battery Depreciation Table
(Table adapted from the author's thesis "Alternative balancing energy in the Alpine region. The technical, legal and economic feasibility of large-scale battery storage for grid stabilization in both Tirol and underdeveloped markets." (2026), [Diplomatische Akademie Wien and Technische Universität Wien])
As of 2026, there are no traditional grid-scale battery facilities in operation in Austria, but one facility is under construction, and it is designed to have 15MW capacity when it comes online, predicted to be in 2027, with an expansion to 20MW a few years later. This facility, based in Tyrol, will be the first of its kind in Austria and add to the Austrian electricity landscape.
Chemical batteries face one additional legal hurdle in Austria. When charging, grid-scale batteries buy electricity from the electric grid and when discharging, sell that electricity back. Some countries, including Germany and Spain, do not charge grid fees for these transactions because the legal structure recognizes that grid-scale batteries are not end users of electricity. In Austria, however, these transactions incur the fees associated with buying and selling electricity, adding extra financial friction to the equation and lessening the profitability of these facilities.
Overall, both hydropumping and traditional batteries have advantages to offer as far as renewable development and electric reliability, but Austria should avoid a heavy reliance on one over the other to ensure grid flexibility. Addressing current regulatory and financial challenges is the key to unlocking support for this diversification.
