Ligne 63 KV - (Lannemezan-Valentine)

### Nombre de pylônes:

118 à 3 Triangles + 19 à 4 Triangles + 16 à 6 Triangles + 1 à 9 Triangles + 1 Drapeau + 1 poteau à 3 Triangles

## Détails:

### Date de suppression:

Lannemezan-Gourdan: construction en liaison souterraine en 2020-2021 et retrait des pylônes en 2021

## Présentation:

La ligne à 63 KV Lannemezan-Valentine est une ligne à haute tension située dans les départements de la Haute-Garonne et des Hautes-Pyrénées en région Occitanie.

Chargement de la 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class=\"mw-parser-output\"\u003E\u003Cp\u003EValentine\n\u003C/p\u003E\u003C/div\u003E","title":"Valentine\n","link":"","lat":43.097333081108474,"lon":0.7005142066424952,"icon":""},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003ELiaison souterraine\n\u003C/p\u003E\u003C/div\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003EDepuis 2017\n\u003C/p\u003E\u003C/div\u003E","title":"Liaison souterraine\n","link":"","lat":43.0769978304441,"lon":0.5722222816140654,"icon":""},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003ELiaison souterraine\n\u003C/p\u003E\u003C/div\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003EDepuis 2017\n\u003C/p\u003E\u003C/div\u003E","title":"Liaison souterraine\n","link":"","lat":43.076034203683825,"lon":0.5718944353562838,"icon":""},{"text":"\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003ELannemezan\n\u003C/p\u003E\u003C/div\u003E","title":"Lannemezan\n","link":"","lat":43.11335469284149,"lon":0.39251121554794377,"icon":""}]}

 **Rose** | Ancien tracé avant enfouissement en 2017.

## Historique:

Construite à l'origine en 1924, cette ancienne ligne permettait de relier Lannemezan à Portet sur Garonne et étais exploitée en 150 KV.

En 1951, suite à la mise en service de la ligne à 220 KV reliant Lannemezan à Verlhaguet, le tracé à Lannemezan fut reconstruit.

Suite à la construction de l'usine à papier de Saint Gaudens, la ligne est déviée au nord de l'usine en 1971. Parallèlement, la ligne est légèrement adaptée entre la Rivière et la D83 suite à la construction de la N125C (portion de l'actuelle A64).

En 1989, la ligne fut fracturée pour être raccordée au poste de Valentine via la création d'une nouvelle section aérienne en double circuits.

Entre 1990 et 1992, suite à la création du poste électrique de Gourdan, une section de la ligne fut reconstruite et regroupée avec la ligne venant de Pointis de Rivière.

En août 2017, les câbles, et les têtes des pylônes sont tous modernisé (certains pylônes sont toutefois remplacé par de nouveaux).

Début octobre 2021, la section datant de 1924 entre Gourdan et Valentine est repeinte.

### Chronologie détaillée:

* 1924: création de la ligne à 150 KV - (Lannemezan-Portet-Saint-Simon).
* 1951: reconstruction du raccordement à Lannemezan.
* 1989: fracture et raccordement en double circuit à Valentine.
* 1990-1992: modification du tracé suite à la création du poste de Gourdan.
* 2017: grande modernisation sur la section (Gourdan-Valentine).

## Futur:

Il est prévu que la section Gourdan-Lannemezan soit déposée au courant 2021. Il était prévu que cette dépose commence dès le mois de janvier mais suite à la pandémie de coronavirus, le projet de création des lignes souterraines a été retardé.

## Description du tracé:

* La ligne à haute tension débute au poste de Lannemezan au sud de la voie ferrée Toulouse-Bayonne, elle se dirige ensuite vers l'est, passe sur la D10, sous les lignes à 225 kilovolts Lannemezan-Cazaril n°2 et n°1, sur la voie ferrée puis sur la D929.
* Après être passé sur l'A64, elle va longer la D817 jusque vers la Mathe où elle commencera à descendre dans la vallée de la Neste.
* Elle passera dans un premier temps en Haute-Garonne où elle surplombera la D638, puis repassera dans le département des Hautes-Pyrénées où elle croisera la voie ferrée reliant Toulouse à Bayonne.
* Juste après d'être repassé dans le département de la Haute-Garonne, elle traversera le lac de Montréjeau puis la Garonne juste avant de passer au dessus du poste de Gourdan.
* Elle fait un tronçon en commun avec la ligne à 63 KV Pointis-de-Rivière-Montréjeau jusqu'à la D825.
* Après avoir traversé l'A645, elle croisera la D8 et se rapprochera aux pieds des montagnes.
* Juste après avoir croisé la D9, elle se dirige en double-circuit vers le nord pour se diriger vers le poste de Valentine où elle s'arrêtera.

## Ancienne ligne:

1. Ligne 150 KV - (Lannemezan-Portet-Saint-Simon).

## Note:

Il était initialement prévu de démonter la ligne dès le début de l'année 2021 mais suite à la crise sanitaire actuelle, la création des deux nouvelles sections en souterrain (Lannemezan-Gourdan) ont pris du retard dans la réalisation des travaux.