A plan by San Diego Gas & Electric to charge a “network use fee” to users of solar energy was stalled Wednesday at the California Public Utilities Commission. At a presentation to a committee in November, SDG&E presented the charge as a fairness issue, since solar customers are hooked to the grid but not paying for the upkeep of wires and other infrastructure. The plan, part of a wider proposal to restructure its rates, met fierce criticism from area politicians and green energy proponents. The California Center for Sustainable Energy estimated the average single-family home customer with solar would have to pay $350 under the plan, and school districts would have be charged $8,100 for each elementary school with rooftop panels. SDG&E argued that customers would still be saving money with the solar option.