My energy bill has increased from £100 to nearly £400

Hi all, I’ve recently moved in with my aunt and brought my gaming pc with me. I currently use it for about ~11 hrs per day (GPU: RTX 5070 ti, CPU: ryzen 7 7800x3D). Before coming, I searched up how much my energy bills would increase by and on the highest end it was like £50ish. Currently getting a lot of heat for it 🙃 so I wanted to confirm if this is normal ? Or am I getting mugged lol.

NOTE: I left my job recently before anyone asks and my heads kinda fried rn so pls excuse any grammar/spelling issues💀