光こう熱ねつ

noun, noun which may take the genitive case particle 'no'

light and heat; energy (for lighting and heating)

Often used in the context of household utilities, especially in the compound 光熱費 (こうねつひ, utility expenses for electricity and gas).

• 今こん月げつの光こう熱ねつ費ひは先せん月げつより高たかかった。

  This month's utility bill was higher than last month's.

• 光こう熱ねつ費ひを節せつ約やくするために、エアコンの設せっ定てい温おん度どを上あげた。

  To save on energy costs, I raised the air conditioner's set temperature.