Maggie Robbins lives alone in a one-bedroom apartment in San Francisco’s Pacific Heights. Because she has no air conditioning, dishwasher, washer or dryer, she uses little electricity. As a result, the net amount she pays Pacific Gas and Electric Co. to deliver electricity to her home could go up by about $20 a month in early 2026, when the big utility implements a new rate structure for some costs of distributing electricity to homes. Under the new scheme, PG&E’s residential customers will pay a fixed monthly charge based on income, but pay a bit less for each kilowatt-hour used. The...