Light
Noun
でんき
電気をつけてください。
Please turn on the light.
電気をつけっぱなしにしないでって言ったじゃん！かせぎが少ないんだから、ちゃんと電気代せつやくにきょう力してよ。
I told you not to leave lights on. You don't earn very much, so you'd better cooperate to save on the electricity bill!
子供の頃は暗闇を恐れていたが、今は電気料金の請求書を受け取る度に、光が怖いと思うよ。
When I was little I was afraid of the dark. Now, when I get my electric bill I’m afraid of the light.
Electricity energy is just a fancy way to say electricity.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.