Extraction schema:
{"type": "object", "title": "UtilityBill", "description": "A residential utility bill (electric and/or gas) from a single provider. Covers single-meter bills (Pepco electric, PPL electric) and dual-commodity bills (We Energies electric+gas). Top-level fields are flat bill-level identifiers and totals; per-meter usage is the repeated list `meters[]`.", "properties": {"utility_provider": {"type": "string", "description": "Name of the utility company that issued the bill. Aliases: 'utility', 'company', the brand printed beside the bill title and in the payment remittance address. Examples: 'We Energies', 'Pepco', 'PPL Electric Utilities'. CASING: use the Title-Case brand exactly as it appears in the running body text and the remittance/return-payment block; do NOT copy the stylized all-lowercase logo wordmark (e.g. the Pepco logo renders 'pepco' but the company is 'Pepco'). Do NOT confuse with the competitive generation supplier (e.g. 'WGL Energy Svcs' on Pepco supply pages; the separate supplier referenced on PPL) — that is the third-party supplier, not the issuing distribution utility. Location: bill header/title and the 'make payable to' / remittance block."}, "account_number": {"type": "string", "description": "The customer's utility account number. Aliases: 'Account Number', 'Account number', 'Account #'. Format: VERBATIM as printed, preserving internal spaces and dashes (e.g. We Energies '0123456789-00003', Pepco '0123 4567 890'). Do NOT confuse with: invoice_number (Pepco '200000088589'), service_number, the long barcode/scanline digit string at the bottom of a payment stub, or the meter number. Location: top summary table or the 'Account number:' label near the customer name; the payment stub repeats it."}, "invoice_number": {"type": ["string", "null"], "description": "The bill/invoice number uniquely identifying this statement, ONLY if the bill prints an explicit 'Invoice Number'/'Bill Number' label. Example: Pepco '200000088589' (printed as 'Invoice Number: 200000088589' on the coupon tear line). Format: verbatim digits as printed. Do NOT confuse with account_number, service_number, or an archive/page/system tag — in particular the We Energies 'WEC_PDF_Out_Archive 00001' string is an internal archive tag, NOT an invoice number, so We Energies invoice_number is null. Return null when no field is explicitly labeled invoice/bill number. Location: near the 'Please tear on the dotted line' coupon line or the bill header."}, "service_number": {"type": ["string", "null"], "description": "The service / point-of-delivery (POD) number distinct from the account number, ONLY if printed. Aliases: 'service number', 'Service No', 'POD ID'. Example: Pepco '0012 3456 7890 7001 6762 64' (printed as 'Residential-R - service number ...' on the 'Details of your Electric Charges' page). Format: verbatim including spaces. Do NOT confuse with account_number or meter_number. Return null if the bill shows no separate service number (e.g. We Energies prints none → null). Location: the per-service detail section header."}, "customer_name": {"type": "string", "description": "The name of the customer/account holder the bill is addressed to. Aliases: 'Customer Name', 'Service to', 'Bill to'. Format: verbatim as printed (e.g. We Energies 'JOHN Q CUSTOMER', Pepco 'PEPCO CUSTOMER'). Do NOT confuse with the utility_provider name or the remittance payee. Location: the addressee block near the service address or above the service-address label."}, "service_address": {"type": "string", "description": "The address where utility service is delivered. Aliases: 'Service Address', 'Your service address', 'Service to'. Format: full street address as printed, single line, including city/state/ZIP if shown (e.g. We Energies '123 MAIN ST NEENAH WI 54956-1802', Pepco '123 9TH ST NW WASHINGTON DC 20012'). Do NOT confuse with the utility's remittance/PO-Box mailing address or the regulator addresses. Location: under the 'Service Address'/'Your service address' label near the customer name."}, "bill_date": {"type": ["string", "null"], "description": "The date the bill was issued/printed, VERBATIM as printed. Aliases: 'Bill Date', 'Bill Issue date', 'Statement Date'. Examples: '02/03/2026', 'May 11, 2015'. RULE: return null if the bill prints no explicit bill/issue/statement date — some bills (e.g. PPL) show only a Due Date and a billing period and have NO issue date; in that case do NOT substitute the due date, the billing-period end, the 'balance as of' date, or a meter-read date. Do NOT confuse with payment_due_date, billing_period_start/end, or the next-meter-read date. Location: top summary table ('Bill Date') or the 'Bill Issue date:' label."}, "billing_period_start": {"type": "string", "description": "Start date of the service/billing period this bill covers. Aliases: 'Bill Period' (first date), 'for the period' (first date), 'Usage from' (first date). Format: VERBATIM as printed; e.g. We Energies '01/05/2026', Pepco 'April 4, 2015'. Do NOT confuse with bill_date or billing_period_end. Location: the 'Bill Period: X to Y' / 'for the period X to Y' line — take the FIRST (earlier) date."}, "billing_period_end": {"type": "string", "description": "End date of the service/billing period this bill covers. Aliases: 'Bill Period' (second date), 'for the period' (second date), 'Usage from' (second date). Format: VERBATIM as printed; e.g. We Energies '02/02/2026', Pepco 'May 5, 2015'. Do NOT confuse with bill_date, payment_due_date, or the next-meter-read date. Location: the 'Bill Period: X to Y' / 'for the period X to Y' line — take the SECOND (later) date."}, "payment_due_date": {"type": "string", "description": "The date payment is due. Aliases: 'Due Date', 'Total amount due by', 'Payment Transfer Date' (for autopay-withdrawal bills). Format: VERBATIM as printed; e.g. Pepco 'Jun 1, 2015' (from 'Total amount due by Jun 1, 2015'). Do NOT confuse with bill_date or billing_period_end, and do NOT use the later late-payment date ('after Jun 1, 2015'). For We Energies (autopay) use the 'Payment Transfer Date' '02/25/2026'. Location: top summary box ('Due Date'/'Payment Transfer Date') or the 'Total amount due by <date>' line."}, "amount_due": {"type": "number", "description": "The total amount due for this bill by the due date, as a number (strip '$' and commas; e.g. We Energies 246.40, Pepco 176.31). Aliases: 'Amount Due', 'Total amount due by <date>', 'Total Current Balance'. Do NOT confuse with: the higher late-payment amount (Pepco 'amount due after Jun 1' 179.06), previous_balance, total_current_charges (when it differs), or a single service subtotal. Location: top 'Amount Due' box or the 'Total amount due by <date>' summary line."}, "previous_balance": {"type": ["number", "null"], "description": "The balance carried from the prior bill before this period's payments/charges, as a number. Aliases: 'Previous Balance', 'Balance from your last bill'. Example: We Energies 277.79, Pepco 287.32. Do NOT confuse with amount_due, balance_forward ($0.00 after payment), or total_current_charges. Use the TOP-LEVEL bill summary value, NOT a per-service sub-summary's 'Balance from last bill'. Return null if not printed. Location: the 'Activity Since Last Bill' / 'Summary of your charges' / 'Billing Summary' block."}, "total_current_charges": {"type": ["number", "null"], "description": "The total NEW charges for the current billing period, taken VERBATIM from a single line that the bill explicitly labels as the combined current-period charges. Accepted labels: 'Total Current Charges', 'Total Current Balance' (We Energies), or an equivalently-labeled single combined-charges total. Example: We Energies 'Total Current Charges $246.40' -> 246.40. RULE: return null if the bill shows no such single combined-current-charges line — do NOT compute it by summing delivery + supply, and do NOT substitute the amount due or a single-service subtotal. Pepco (separate 'New electric distribution charges' + 'New WGL Energy Svcs supply charges', no combined current-charges line) -> null. PPL (separate 'Total Delivery Charges' + 'Total Supply Charges', no combined current-charges line) -> null. Do NOT confuse with amount_due, previous_balance, total_delivery_charges, or total_supply_charges. Location: the charges-summary / billing-summary block."}, "total_delivery_charges": {"type": ["number", "null"], "description": "Total distribution/delivery charges billed by the regulated utility for the current period, as a number, ONLY when the bill cleanly separates delivery from supply. Aliases: 'Total Delivery Charges', 'Total Electric Delivery Charges', 'New electric distribution charges'. Example: Pepco 21.01 ('New electric distribution charges - Pepco'). Return null when the bill does NOT split delivery vs supply: We Energies shows commodity totals (Electric Service Total + Gas Service Total) with no delivery/supply split → null. Do NOT use a commodity subtotal (e.g. We Energies gas distribution line) as the delivery total. Location: the delivery/distribution charges subtotal."}, "total_supply_charges": {"type": ["number", "null"], "description": "Total supply/generation charges (often billed for a competitive/third-party supplier) for the current period, as a number, ONLY when the bill cleanly separates supply from delivery. Aliases: 'Total Supply Charges', 'supply charges', 'Generation & Transmission Charges'. Example: Pepco 155.30 ('New WGL Energy Svcs supply charges'). Return null when the bill does NOT split supply vs delivery (bundled): We Energies is bundled (no delivery/supply split) → null. Do NOT use a commodity subtotal (e.g. We Energies 'Gas Supply Service' line) as the supply total. Location: the supply/generation charges subtotal."}, "meters": {"type": "array", "description": "One entry per metered service on the bill. Single-meter electric bills have one entry (Pepco: one electric meter); dual-commodity bills have one electric + one gas entry (We Energies: meter NZT0123456 electric + meter 0WG0123456 gas). Aligned by meter_number.", "items": {"type": "object", "properties": {"meter_number": {"type": "string", "description": "The meter identifier for this metered service. Aliases: 'Meter', 'Meter Number', 'Meter No'. Format: VERBATIM alphanumeric as printed (e.g. We Energies 'NZT0123456' / '0WG0123456', Pepco '1ND344415274'). Do NOT confuse with account_number, service_number, or the rate/schedule code (e.g. 'Rg1', 'Residential-R'). Location: the per-service block ('Meter <id>') or the 'Meter Number' column of the usage table."}, "service_type": {"type": "string", "enum": ["electric", "gas", "water"], "description": "The commodity this meter measures. 'electric' for kWh electric service, 'gas' for natural-gas service (therms/CCF), 'water' for water. Infer from the service section heading ('Electric Service', 'Gas Service', 'Residential Electric Service', 'Use (kWh)'). Do NOT guess: choose by the section the meter appears under and its usage unit. We Energies meter NZT0123456 is electric; meter 0WG0123456 is gas."}, "current_reading": {"type": ["number", "null"], "description": "The most recent (ending) meter reading for this period, as a number (drop any leading zeros' formatting; the numeric value). Aliases: 'Current Reading', 'Actual Reading <later date>'. Example: We electric 40705, We gas 1464, Pepco 57043 (printed '057043'). Do NOT confuse with previous_reading (the earlier/beginning reading) or usage_quantity (the difference). Return null if no numeric reading is printed. Location: the meter-reading rows/table for this meter — the later of the two read dates ('Current Reading' column)."}, "previous_reading": {"type": ["number", "null"], "description": "The prior (beginning) meter reading for this period, as a number (the numeric value). Aliases: 'Previous Reading', 'Actual Reading <earlier date>'. Example: We electric 40036, We gas 1385, Pepco 55628 (printed '055628'). Do NOT confuse with current_reading (the later reading) or usage_quantity. Return null if not printed. Location: the meter-reading rows/table for this meter — the earlier of the two read dates ('Previous Reading' column)."}, "usage_quantity": {"type": "number", "description": "The billed consumption for this meter over the period, as a number. For electric use the billed kWh; for gas use the billed therms (the unit the gas charges are calculated on), NOT the raw CCF reading difference. Example: We electric 669 (kWh), We gas 83.9 (therms — the '79 CCF x 1.062 BTU = 83.9 Therms' converted value, NOT 79), Pepco 1415 (kWh). Do NOT confuse with current_reading/previous_reading or the raw reading difference when a meter constant/CCF→therms conversion applies. Location: the 'Total Use'/'KWH'/'Therms Used'/'Total Difference' figure for this meter."}, "usage_unit": {"type": "string", "enum": ["kWh", "therms", "CCF", "gallons"], "description": "The unit of usage_quantity. 'kWh' for electric, 'therms' for gas billed on therms, 'CCF' only if the gas bill is billed on CCF with no therms conversion, 'gallons' for water. Must match the unit usage_quantity is expressed in. For We Energies gas, usage_quantity is 83.9 therms so usage_unit='therms' (NOT 'CCF', even though the raw reading difference is 79 CCF)."}}, "required": ["meter_number", "service_type", "usage_quantity", "usage_unit"]}}}, "required": ["utility_provider", "account_number", "customer_name", "service_address", "billing_period_start", "billing_period_end", "payment_due_date", "amount_due", "meters"]}

Expected output:
{"utility_provider": "We Energies", "account_number": "0123456789-00003", "invoice_number": null, "service_number": null, "customer_name": "JOHN Q CUSTOMER", "service_address": "123 MAIN ST NEENAH WI 54956-1802", "bill_date": "02/03/2026", "billing_period_start": "01/05/2026", "billing_period_end": "02/02/2026", "payment_due_date": "02/25/2026", "amount_due": 246.4, "previous_balance": 277.79, "total_current_charges": 246.4, "total_delivery_charges": null, "total_supply_charges": null, "meters": [{"meter_number": "NZT0123456", "service_type": "electric", "current_reading": 40705.0, "previous_reading": 40036.0, "usage_quantity": 669.0, "usage_unit": "kWh"}, {"meter_number": "0WG0123456", "service_type": "gas", "current_reading": 1464.0, "previous_reading": 1385.0, "usage_quantity": 83.9, "usage_unit": "therms"}]}