extract the PG&E net energy metering (NEM) statement: account summary, the per-bill-period NEM charge summary array, the per-line electric monthly delivery charges, and the meter import/export totals. amounts may be negative (credits) and may carry a trailing minus or parentheses; preserve sign as a negative number. nemCharges has one entry per bill-period end date in the 'Summary of NEM Charges' table (net usage kWh and the estimated NEM charges). monthlyChargeLines has one entry per dated charge line in 'Details of Electric Monthly Charges' (days @ rate = amount), e.g. 'Minimum Delivery Charge 13 days @ $0.39167 = $5.09'. meter import/export/net usage come from the Service Information box. totalElectricMonthlyCharges should reconcile to the sum of monthlyChargeLines amounts. dates printed as MM/DD/YYYY; convert to YYYY-MM-DD.
