$5-$10 for peak usage isn’t terrible. My utility company did some bullshit where they would take your busy hour of usage and if it was exponentially higher than your normal usage (something that only happens with solar, since your standard usage is usually zero) and then did some outrageous multipliers. Some people I knew were getting near $100 peak usage fees.

They quit doing that a year or two ago, but still made it an easy decision for me to get a power wall just in case they tried that crap again.