Presa de Soria, reservoir on the island of Gran Canaria

Presa de Soria is a 132-metre-high, 148-metre-long concrete arch dam between Mogán and San Bartolomé de Tirajana on Gran Canaria. It impounds the Soria reservoir, fed by the Arguineguín ravine and overflows from the Chira and Las Niñas dams. On the left bank, a 23-metre-long free-overflow spillway with a flip bucket discharges up to 120.2 m³/s.

Built between 1962 and 1972, the dam was finished the same year as the Norwegian source's completion date and was designed to hold back the Soria reservoir between Mogán and San Bartolomé de Tirajana. Its water comes from the overflow of the Chira dam through a tunnel, from the Las Niñas dam via the Majada Alta ravine, and from the Arguineguín ravine itself. In 2021 the Cabildo de Gran Canaria approved a 200 MW pumped-storage plant downstream of Chira, planned to start operating in 2026, whose water ends up in Soria.

The reservoir takes its name from the hamlet of Soria beside it, in the Arguineguín valley between Mogán and San Bartolomé de Tirajana. Its water comes from the overflows of the Chira and Las Niñas dams and from the Majada Alta and Soria ravines. The Chira-Soria pumped-storage plant approved in 2021 is to use Soria as its lower basin, filling both dams with desalinated seawater when grid power is surplus.

The dam lies between Mogán and San Bartolomé de Tirajana, reached from the village of Soria; the reservoir has never filled, so expect low water and exposed banks rather than a full lake. The spillway on the left bank has a 23 m span and a launch ski jump. Access roads are narrow mountain roads; carry your own water and supplies.

Soria is the only dam on Gran Canaria that has never overflowed. Its record level came in January 2011, when the reservoir held 12,496 hm³, about 39% of its 32 hm³ capacity. The Chira-Soria pumped-storage plant approved in 2021, with 200 MW planned for 2026, will use Soria as its lower basin.