Ligne 150 KV - (Bagnols-sur-Cèze - Monistrol-d'Allier)

## Présentation

La ligne Bagnols-Monistrol est une ancienne liaison à 150 000 volts de 125 km qui reliait la centrale hydro-électrique de Monistrol-d'Allier au poste d'interconnexion de Bagnols-sur-Cèze. Elle a vécu 15 ans avant d'être réutilisée pour créer l'artère à très haute tension Pratclaux-Bollène.

Chargement de la 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class=\"mw-parser-output\"\u003E\u003Cp\u003EMonistrol\n\u003C/p\u003E\u003C/div\u003E","title":"Monistrol\n","link":"","lat":44.967441886322895,"lon":3.647078062303013,"icon":""},{"text":"\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003EBagnols-sur-C\u00e8ze\n\u003C/p\u003E\u003C/div\u003E","title":"Bagnols-sur-C\u00e8ze\n","link":"","lat":44.20067814054575,"lon":4.648371933685964,"icon":""}]}
## Historique :

Cette ligne fut construite par la STEC (Société de Transport d'Energie du Centre) au milieu des années 1930. A sa mise en service, Bagnols était alors un important poste d'interconnexion entre le Massif Central, les Pyrénées, la vallée du Rhône et le littoral méditerranéen. Sa mise en service entraina la création d'un second poste à Monistrol, situé 150m au Sud de celui d'origine sur la rive opposée. Un portique a deux niveaux fut installé pour y faire arriver la ligne conjointement avec la liaison 220 KV Monistrol-Rueyres. (Ce portique existe toujours mais l'étage supérieur recevant la ligne Monistrol-Rueyres a été démonté au début des années 1980)

*Vue générale de Monistrol, avec au fond l'arrivée dans le poste 2 de la ligne venant de Bagnols (image Delcampe.net)*

Elle fut exploitée une quinzaine d'année sous sa forme d'origine. En 1950, avec le développement du réseau 225 KV, le poste de Pratclaux est mis en service sur les hauteurs de Monistrol et la totalité de la ligne est alors réutilisée deux ans plus tard pour créer une liaison 225 KV Pratclaux-Bollène (Suite à l'achèvement du barrage André Blondel sur le Rhône).

A partir de cette époque, le poste de Bagnols-sur-Cèze perdit peu à peu de son importance pour devenir aujourd'hui un simple poste source du réseau local à 63 KV.

En 1965, une section de 10km est déposée suite au déroutage de la ligne Pratclaux-Bollène vers l'usine hydraulique de Pied-de-Borne.

## Description du tracé:

* La ligne débute à l'ancien poste de l'usine hydro-électrique de Monistrol-d'Allier et grimpe le versant Ouest des gorges de l'Allier.
* Elle suit la rivière et la ligne des Cévennes et croise la N88 à 3km au Sud-Ouest de Langogne.
* Arrivée à Luc, elle traverse l'Allier et la voie ferrée puis bifurque vers l'Est pour attaquer la montagne Ardéchoise.
* Après avoir franchit les gorges de la Borne, elle tourne vers le Sud et arpente la corniche du Vivarais Cévenol. C'est arrivée au lieu-dit "La Bombine" que démarre le tronçon déposé en 1965.
* La ligne descendait alors la corniche en suivant la D4 puis bifurquait plein Sud au croisement avec la D10. Elle retrouvait le tracé actuel à Seyras, 5km au Sud.
* A partir de Seyras, la ligne quitte les Cèvennes et traverse un relief plus plat, elle se compose désormais principalement de pylônes à 3 triangles. Elle prend la direction du Sud-Est et garde ce cap jusqu'aux alentours de Bagnols-sur-Cèze.
* Elle contourne Saint-Nazaire par le nord puis arrive dans le poste de Bagnols-sur-Cèze, sur la commune de Vénéjan.

## Tronçon récupérés pour la création de nouvelles lignes :

* Ligne 225 KV - (Pratclaux - Montgros)
* Ligne 225 KV - (Montgros - Laveyrune)
* Ligne 225 KV - (Pied-de-Borne - Laveyrune)
* Ligne 225 KV - (Pied-de-Borne - Lafigère - Barjac) - Piquage
* Ligne 225 KV - (Barjac-Bollène)
* Ligne 225 KV - (Barjac-Croisière)
* Ligne 225 KV - (Pratclaux - Bollène)