冷熱 れいねつ発電 はつでんじゃなかったです
reinetsuhatsudenjanakattadesu

Noun
Desu Copula

The polite, past negative form of 冷熱発電

1. Wasn't geothermal power generation.; Wasn't heat/cold power generation.

Past/Perfective
Negative
Polite
Casual Register