潮汐 ちょうせき発電 はつでんじゃありませんでした
chōsekihatsudenjārimasendeshita

Noun
Desu Copula

The polite, past negative form of 潮汐発電

1. Was not tidal power.; Wasn't tidal power.

Past/Perfective
Negative
Polite
Terminal Form