Connection to the High-Voltage Grid
Due to its relatively high power, the Gravity Storage must be connected to at least the 110 KV grid. Correspondingly, a line to the grid should be as direct and short as possible, and not have to cover great distances. Otherwise, the possible costs of the connection with an extensive grid expansion would have to be added. Depending on the site, however, even extensive grid expansion costs could prove worthwhile.
With Gravity Storage, the water is pumped underneath a large rock mass. Depending on the size of the storage, the water demand is variable.
Gravity Storage plants should be located in areas with solid bedrock. The most favorable sites have stable, little-faulted rock such as granite or compact layers of otherwise solid rock material.