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With the current development in energy policy and climate change, the need for electricity storage in Switzerland increases. A possibility to increase the storage capacity is to heighten existing dams of hydropower schemes. To systematically assess such heightening options, a procedure with a set of criteria is proposed. The procedure is presented and illustrated by examples of a rockfill and an arch dam. Selected results for 33 Swiss dams impounding reservoirs with storage volumes of more than 20 million m(3) are presented and discussed.