{"type": "object", "properties": {"BILLRUNNO": {"type": "integer", "minimum": 0, "maximum": 65535, "description": "The sequential number of a billing run"}, "CONTRACTYEAR": {"type": "integer", "minimum": 0, "maximum": 65535, "description": "Contracted Year (calendar year)"}, "FROMREGIONID": {"type": "string", "enum": ["QLD1", "VIC1", "TAS1", "NSW1", "SA1"], "description": "Nominated source region for Interconnector"}, "INTERCONNECTORID": {"type": "string", "description": "Contracted Interconnector"}, "PARTICIPANTID": {"type": "string", "description": "Unique participant identifier"}, "QUARTER": {"type": "integer", "maximum": 127, "minimum": -128, "description": "Residue Contract Quarter"}, "RESIDUEYEAR": {"type": "integer", "maximum": 32767, "minimum": -32768, "description": "Year of the Residue Contract; may differ from the calendar year at week 1."}, "WEEKNO": {"type": "integer", "minimum": 0, "maximum": 65535, "description": "Week no within the contract year. Week no 1 is the week containing 1st January\nWARNING: There may be 53 weeks in a year, depending on how weeks align to the year start/end."}, "ACTUALPAYMENT": {"type": "number", "description": "Net payment to participant, including auction fees"}, "AUCTIONFEES": {"type": "number", "description": "Total auction fees payable in this week (negative amount). If AUCTIONFEES + AUCTIONFEES_GST >= TOTALSURPLUS then ACTUALPAYMENT is zero"}, "AUCTIONFEES_GST": {"type": "number", "description": "The GST amount on the auction fees, always being zero."}, "CSP_DEROGATION_AMOUNT": {"type": "number", "description": "The CSP derogation amount applied as an adjustment to SRA."}, "LASTCHANGED": {"type": "string", "examples": ["2026/01/20 00:05:00"], "format": "date-time", "description": "Date and time this record was last modified"}, "NEGATIVE_RESIDUES": {"type": "number", "description": "Negative residues in the billing week for this participant in the SRA Year/Quarter"}, "TOTALSURPLUS": {"type": "number", "description": "Total residue amount allocated to participant"}, "UNADJUSTED_IRSR": {"type": "number", "description": "The SRA amount unadjusted by CSP."}}, "required": ["BILLRUNNO", "CONTRACTYEAR", "FROMREGIONID", "INTERCONNECTORID", "PARTICIPANTID", "QUARTER", "RESIDUEYEAR", "WEEKNO"], "description": "BILLINGIRAUCSURPLUSSUM contains Auction fees and Settlements Residue Auction distribution that may arise from unpurchased auction units that accrue to Transmission Network Service Providers.\nBILLINGIRAUCSURPLUSSUM is confidential to the relevant participant.\n\nSource\n\nBILLINGIRAUCSURPLUSSUM is populated by the posting of a billing run\nwhere there are unpurchased auction units.\n\nVolume\n\nAn indicative maximum is eight records inserted per billing run, or 88\nrecords inserted per week."}