Continuité : Ligne 225 KV - (Pratclaux - Bollène)

## Ligne 225 KV - (Pratclaux - Bollène)

### Nombre de pylônes:

412 supports :207 nappes + 23 nappes à 2 circuits + 178 pylônes à 3 triangles + 3 chat + 1 portique treillis

## Détails:

### Date de création:

Monistrol-Vénéjan: 1935Vénéjan-Bollène: 1952

### Date de suppression:

1965 : tronçon Seyras - Montselgues2000 : tronçon Bollène - Croisière (reconstruction)

## Présentation :

La liaison Pratclaux-Bollène est une ancienne ligne à 225000 volts qui reliait le barrage de Donzère-Mondragon (ou André Blondel) au poste d'interconnexion de Pratclaux dans le haut-Allier. Elle est aujourd'hui fragmentée en 6 lignes distinctes.

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 **Vert foncé:** | Ancien tracé avant le déroutage vers Pied-de-Borne de 1965 + Déviation du tronçon Vénéjan-Bollène de 1985 à 2003.

## Historique :

Cette liaison a vu le jour en 1952 avec la mise en service du barrage André Blondel. Pour l'établir, EDF réutilisa en totalité l'ancienne ligne 150KV Monistrol-d'Allier - Bagnols-sur-Cèze et érigea 23 pylônes nappes à 2 circuits pour la coupler avec la ligne Bollène - Saint-Victor de Vénéjan au barrage. Un piquage fut créé à l'occasion dans le poste de Bagnols-sur-Cèze.

Dans le contexte de développement du réseau 225 KV après guerre, cela permit de créer une interconnexion à très haute tension entre la vallée du Rhône, le Massif central et les Pyrénées.

Depuis l'aménagement hydraulique du Chassezac en 1965, la ligne a été fractionnée à plusieurs reprises. Un tronçon de 18 km fut renouvelé entre 1973 et 1975 entre Vénéjan et Issirac, avec le remplacement des pylônes à 3 triangles par des chats (ainsi que 6 pylônes à 6 triangles de Saint-Nazaire à Vénéjan ou elle est montée conjointement avec la ligne Bollène - Saint-Victor).

Elle a même était déroutée entre Vénéjan et Bollène entre le début des années 1980 et les années 2000 quand EDF décida de supprimer les croisements de lignes aux abords du poste de Bagnols. Durant cette période, la ligne réutilisa un tronçon de l'ancienne liaison 225 KV Bollène-l'Ardoise N°1. Quand ce dernier fut démonté en 2003, elle repris son tracé d'origine.

### Chronologie détaillée :

* 1965 : déviation de la ligne vers la nouvelle usine de Pied-de-Borne (48)
* 1967 : Piquage vers l'usine hydro-électrique de Lafigère (07)
* Vers 1970 : suppression du piquage à Bagnols-sur-Cèze.
* Entre 1973 et 1975 : Remplacement de la majorité des pylônes entre Vénéjan et Issirac.
* Entre 1981 et 1985 : déviation du tracé via Pont-Saint-Esprit par un tronçon de l'ancienne ligne 225 KV Bollène-l'Ardoise N°1.
* 1993 : mise en service du poste de Barjac (30)
* 2000 : création d'une sous-station LGV à Croisière (84) et reconstruction du tronçon Bollène-Croisière.
* 2003 : Dépose de la ligne passant à Pont-Saint-Esprit et reprise du tracé d'origine.
* 2016 : création du poste de Laveyrune (07) pour raccordement d'un parc éolien
* 2019 : Mise en service du poste de Montgros (48)

## Description du tracé :

* La ligne débute au poste de Pratclaux et part vers le Sud, franchissant les gorges de l'Allier au dessus de Monistrol.
* Elle suit l'Allier et la ligne des Cévennes en arpentant le versant Ouest de la vallée 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, 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 aux abords du poste de Bagnols-sur-Cèze ou elle se rejoint avec la ligne 63 KV Bollène-Sabran (ancienne ligne 225 KV Bollène - Saint-Victor).
* Pour finir, les deux lignes, montées conjointement sur des pylônes nappes à 2 circuits, remontent vers le Nord puis parcourent une quinzaine de kilomètre avant d'arriver au barrage André Blondel.

## Lignes de la continuité :

* 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-Croisière)

## Ancienne ligne :

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