Perforation type: 13x13

Subject:

The nominal value is N20g.

Wind energy. A wind farm located in Parque Eólico Da Serra Das Meadas, 110 km east of Porto.

Topics: Wind turbines

Perforation type: 13x13

Subject:

The nominal value is A20g.

Energy of water. The Alqueva Dam*

Additional:

*The Alqueva Dam is an arch dam and the centrepiece of the Alqueva Multipurpose Project. It impounds the River Guadiana, on the border of Beja and Évora Districts in south of Portugal. The dam takes its name from the town of Alqueva to its right bank. It creates a large reservoir with an inter-annual regulation capacity from which water may be distributed throughout the region. The dam was completed in 2002 and its reservoir reached the full level, for the first time, in 2010. The 518.4-megawatt (695,200 hp) power station was commissioned in two stages, stage I in 2004 and stage II in 2013. The Alqueva Dam constitutes one of the largest dams and artificial lakes (250 square kilometres (97 sq mi)) in Western Europe.

Topics: Hydroelectricity