The power cable is an important quest that you must bring to a certain NPC. However, you won't be able to find it just lying around in various places in the game.
STRAY – How to get electrical cable for grandma! | Full Walkthrough (Stray Guide)
As you venture into the world of Stray, you will eventually come across NPCs who will help you on your journey. Some of them will be there just to greet you on the way while others will hand out some quests that you need to complete. One such NPC is Grandma who you can find in the slums.
When she meets her, she'll ask you to bring her an electrical cord that she'll use to knit a poncho. But as she mentioned, it won't be easy to look for the material around those parts. In fact, you won't find the quest item lying on the ground either.
In this guide, I show how you can get an Electric Cable that you can then take to grandma.