Ligne 150 KV - (l'Argentière-Grisolles)

## Présentation :

La ligne l'Argentière-Grisolles est une ancienne ligne électrique à 150 000 volts qui reliait l'usine hydroélectrique de l'Argentière-la-Bessée au poste de Grisolles près de Gap. Elle fut fracturée dans les années 1960 après la création du barrage de Serre-Ponçon et a été entièrement déposée fin 2020 lors des travaux de rénovation du réseau en haute Durance.

Chargement de la 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class=\"mw-parser-output\"\u003E\u003Cp\u003EGrisolles\n\u003C/p\u003E\u003C/div\u003E","title":"Grisolles\n","link":"","lat":44.57839582135793,"lon":6.136393727503071,"icon":""},{"text":"\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003El'Argenti\u00e8re\n\u003C/p\u003E\u003C/div\u003E","title":"l'Argenti\u00e8re\n","link":"","lat":44.79029937284309,"lon":6.559777645308751,"icon":""}]}
## Historique :

Cette ligne a vu le jour après la mise en service du barrage de Bissorte. Elle faisait partie d'un réseau d'interconnexion établie par *l'Union pour l'Industrie et l'Electricité* (UNIE) pour relier les usines hydro-électriques de Savoie avec celles de la Durance. Un portique fut également construit au col du Lautaret pour réaliser une ligne en piquage descendant vers les centrales installées sur la Romanche (Mizoën et Saint-Guillerm, alimentées par le barrage du Chambon).

Cette liaison entrait en coupure dans le poste de l'Argentière via deux portiques installés côte à côte. D'ici, la ligne suivait le cours de la Durance et se raccordait au poste de Grisolles près de Gap. Celui ci fut créé pour devenir à terme un poste d'interconnexion avec la région Grenobloise et la Provence, qui prendra forme au début des années 1940 avec la création de deux autres lignes à 150 KV dirigées vers le barrage du Sautet et l'usine électrique de Sainte-Tulle.

La mise en service du barrage de Serre-Ponçon en 1960 marque la fin de la ligne l'Argentiere-Grisolles. Dans l'année qui suit, elle est fracturée au niveau de Prunières; la partie orientale est déroutée vers le nouveau barrage tandis que la section occidentale est momentanément mise hors tension. Elle sera réutilisée une dizaine d'année plus tard pour créer la ligne 63 KV Grisolles - Mont-Dauphin.

D'importants travaux on été engagés dans les années 2010 pour restructurer le réseau électrique dans la haute vallée de la Durance, considéré comme vieillissant et insuffisamment dimensionné. Dans le cadre de ce projet de restructuration, tous les pylônes de la ligne originelle ont été démontés fin 2020. La liaison entre L'Argentière et Serre-Ponçon est désormais assurée par une nouvelle ligne aérienne à 225 KV.

## Description du tracé :

La ligne suivait le cours de la Durance en rive droite sur la majorité de son parcours.

* Elle sortait du poste de l'Argentière par l'Est, franchissait la Durance et la N94 puis obliquait tout de suite vers le Sud via un portique tourné à 45°.
* Au Nord de La Roche-de-Rame, elle croisait à nouveau la route et la rivière puis grimpait sur le flanc de la vallée. A partir d'ici, la ligne suivait la Durance en rive droite sur plus de 35 km.
* Au niveau de Saint-Crépin, elle tournait légèrement vers le Sud-Ouest puis franchissait la vallée du torrent de Saint-Thomas.
* Elle franchissait plusieurs autres vallées avant d'arriver à hauteur d'Embrun. D'ici, elle tournait vers l'Ouest et continuait de suivre la Durance jusqu'à Prunières.
* A Prunières, la ligne remontait vers le Nord-Ouest pour suivre la N94 et la voie ferrée Veynes-Briançon jusqu'à arriver au poste de Grisolles, à 2 kilomètres de Gap,

## Tronçon récupérés pour la création de nouvelles lignes :

* Ligne 150 KV - (l'Argentière - Serre-Ponçon)
* Ligne 63 KV - (Grisolles - Mont-Dauphin)