Not directly related to cars, but PG&E is unable to handle the incoming requests for electrical system upgrades[1]. Many older houses don't have the electrical panel capacity and they need engineering signoff from the utility.
Subject and writer are idiots. Any electrician worth their master license would not have installed a 125A panel in 2019 unless this woman lives in a converted cottage. Also unless this woman is running a grow house or has a 4000 square foot home they intend to heat with resistive heating she will never use 300A service.