PDF - 9Mo - Grande Dixence SA

GD. P.62A senseof balanceThe Dispatching Centre (CEG)All those involved in supplying electric energy are veryaware of one thing: their job is akin to that of a tightropewalker. Absolutely dependent on consumer demandand the whims of the weather, completely caught byproduction constraints and grid congestion, needingto pay attention to many other factors, energy suppliersand distributors must juggle with an essential rule,a basic axiom: at any one moment, the electricity generatedmust equal the electricity consumed. So everykWh must be produced at the precise moment it isconsumed!To enable it to perform its task properly, EOS has aDispatching Centre (CEG or Centre d’Exploitation etde Gestion). From there, EOS manages and coordinatesits electricity generating fleet in real time, in closecooperation with the Grande Dixence Water ManagementCentre at Sion. This control centre is the brainof the operation. It enables generation management,transmission operation, energy exchanges and theconstant balancing of the electricity grid to be controlled24 hours a day, 365 days a year.EOS (Energie Ouest Suisse) has been mandated bythe shareholders of Grande Dixence to manage theenergy flows produced by the Grande Dixence complexwith a view to maintaining the flexibility of thescheme in the best possible way.