ちょう高圧 こうあつ送電 そうでんではありませんでした
chōkō atsusōdendewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 超高圧送電

1. Was not ultra-high voltage transmission.; Was not high-voltage transmission.

Past/Perfective
Negative
Polite
Formal Register