Does upgrading from 16GB to 32GB RAM noticeably increase your electricity bill?

Negligible. You’re talking maybe 2–5 extra watts at idle, 5–10 under load. Your gaming PC already draws 300–500W while gaming, so it’s less than a 2% bump. RAM is one of the lowest-power components—a single DDR5 stick pulls 3-4W under heavy use. Focus on your GPU undervolt or PSU efficiency for real savings. If you need 32GB, the performance gain is worth it; the power cost is noise.