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At the crossroads of Lozere, in the Ardeche and Haute-Loire, a few meters from Lake naussac,at 1000 meters, a reservoir of clean air and feast for the eyes.At the crossroads of Lozere, in the Ardeche and Haute-Loire, a few meters from Lake naussac, 1000 meters, a reservoir of clean air and feast for the eyes. Welcome to the "Lake NaussacMany activities: Fishing, swimming, hiking, mountain biking, sailing, golf, whitewater, etc. ...Dam Naussac (from the site-www.eptb loire.fr)..Concern about the flow of support on the Loire basin, appears in the 1970s with the development of irrigation and equipment in nuclear power plants. It was during this period that the state retains the proposed construction of two dams and Naussac Villerest. Project management of the dam Naussac said "development Naussac I" was granted by the State at SOMIVAL, development company under his tutelage. Dam Naussac was commissioned in 1983.
The annual average intake in the reservoir is insufficient to ensure filling each year, the Loire River (formerly EPALA) decided to take over the project Naussac 2. Planned from the outset, it consisted of the realization of a pumped storage power plant, intended to complete the filling of the reservoir by pumping in the Allier.
Constructed under the project management of property, plant was commissioned in 1997. At the end of the concession by SOMIVAL in 2003 and after a trial period of three years, the state owns the facilities Naussac I had transferred their ownership to the property on 1 January 2007. The property thus became the sole manager of the dam and mill.This gravity dam with a height of 50 meters, is equipped with a water intake tower, to channel water to the pump storage plant and a hollow jet valve.The principles of water management facilities (maximum score, rules pumping variation rules of outflow ...) are defined in the regulation of water, stopped by the State after a public inquiry.The support of low flowsNaussac function is to maintain a minimum flow in the Allier and the Loire, in periods of low water to allow the fulfillment of various water uses. (Villerest Dam, near Roanne, also owned by the Loire River, provides the same function on the Loire).