| { |
| "schema_version": "1.0", |
| "case_id": "floater-005", |
| "title": "Split discharge at two terminals", |
| "difficulty": "hard", |
| "task": "Update the synthetic European gas balance from the supplied LNG floater observations. Use only this case and return JSON matching schemas/answer.schema.json.", |
| "as_of": "2026-01-14T12:00:00Z", |
| "scope": { |
| "market_area": "EU27+UK", |
| "included_terminal_ids": [ |
| "FR-DKK", |
| "BE-ZEE", |
| "GB-SOU", |
| "NL-GATE" |
| ], |
| "balance_gas_days": [ |
| "2026-01-15", |
| "2026-01-16", |
| "2026-01-17" |
| ], |
| "cargo_lookahead_end": "2026-01-20" |
| }, |
| "conventions": { |
| "unit": "GWh", |
| "timezone": "Europe/Brussels", |
| "gas_day_start_local": "06:00", |
| "balance_representation": "signed_contribution", |
| "balancing_component_id": "storage_net", |
| "must_balance": true, |
| "rounding_gwh": 0.001, |
| "unknown_policy": "emit_null" |
| }, |
| "rules": [ |
| { |
| "rule_id": "R-CUTOFF", |
| "description": "Use an observation only when received_at is at or before as_of and retracted is false." |
| }, |
| { |
| "rule_id": "R-SOURCE-PRECEDENCE", |
| "description": "For destination and arrival, terminal_nomination outranks port_call, which outranks AIS. Equal-priority conflicts remain unresolved." |
| }, |
| { |
| "rule_id": "R-AIS-DESTINATION-STALENESS", |
| "description": "An AIS destination older than 24 hours at as_of is stale and cannot override a non-stale higher-priority source.", |
| "stale_after_hours": 24 |
| }, |
| { |
| "rule_id": "R-STATE-LADEN", |
| "description": "A recent AIS observation explicitly marked laden and underway supports the inferred state laden_underway." |
| }, |
| { |
| "rule_id": "R-GAS-DAY", |
| "description": "Assign arrival to the gas day containing it in the case timezone. Gas days begin at 06:00 local time." |
| }, |
| { |
| "rule_id": "R-SENDOUT-STANDARD-3D", |
| "description": "Allocate an in-scope discharge over three gas days from its start day using fractions 0.20, 0.50, and 0.30.", |
| "fractions": [ |
| 0.2, |
| 0.5, |
| 0.3 |
| ] |
| }, |
| { |
| "rule_id": "R-OUTAGE-PUSH", |
| "description": "If sendout would start on a zero-capacity gas day, shift the whole three-day profile to the first open gas day." |
| }, |
| { |
| "rule_id": "R-DUPLICATE", |
| "description": "Records for the same IMO, voyage_id, event, time, and value describe one cargo event, even when supplied by multiple feeds." |
| }, |
| { |
| "rule_id": "R-SPLIT", |
| "description": "When explicit discharge fractions sum to one, keep one cargo identity and create one discharge leg per terminal." |
| }, |
| { |
| "rule_id": "R-SCOPE", |
| "description": "An out-of-scope discharge contributes zero to European LNG sendout; retain its energy as unallocated_gwh for auditability." |
| }, |
| { |
| "rule_id": "R-UNKNOWN", |
| "description": "Return null and an exception when the supplied evidence and rules cannot resolve a material value. Do not invent conversions or tie-breakers." |
| }, |
| { |
| "rule_id": "R-CARGO-DIFF", |
| "description": "LNG balance delta equals updated in-scope cargo sendout minus the matched prior cargo sendout for each gas day." |
| }, |
| { |
| "rule_id": "R-BALANCE-ARITHMETIC", |
| "description": "For every balance row, updated_contribution_gwh equals prior_contribution_gwh plus delta_contribution_gwh." |
| }, |
| { |
| "rule_id": "R-BALANCER", |
| "description": "Offset the LNG sendout delta in storage_net with the opposite sign so the daily residual stays zero." |
| } |
| ], |
| "reference_data": { |
| "terminals": [ |
| { |
| "terminal_id": "FR-DKK", |
| "name": "Dunkerque LNG", |
| "timezone": "Europe/Paris", |
| "in_scope": true |
| }, |
| { |
| "terminal_id": "BE-ZEE", |
| "name": "Zeebrugge LNG", |
| "timezone": "Europe/Brussels", |
| "in_scope": true |
| }, |
| { |
| "terminal_id": "GB-SOU", |
| "name": "South Hook LNG", |
| "timezone": "Europe/London", |
| "in_scope": true |
| }, |
| { |
| "terminal_id": "NL-GATE", |
| "name": "Gate LNG", |
| "timezone": "Europe/Amsterdam", |
| "in_scope": true |
| }, |
| { |
| "terminal_id": "TR-ALI", |
| "name": "Aliaga LNG", |
| "timezone": "Europe/Istanbul", |
| "in_scope": false |
| } |
| ], |
| "sendout_profiles": { |
| "standard-3d": { |
| "fractions": [ |
| 0.2, |
| 0.5, |
| 0.3 |
| ] |
| } |
| }, |
| "capacity_schedule": [], |
| "unit_conversions": [] |
| }, |
| "prior_balance": [ |
| { |
| "record_id": "bal-2026-01-15-domestic_production", |
| "gas_day": "2026-01-15", |
| "component_id": "domestic_production", |
| "contribution_gwh": 480.0 |
| }, |
| { |
| "record_id": "bal-2026-01-15-pipeline_imports", |
| "gas_day": "2026-01-15", |
| "component_id": "pipeline_imports", |
| "contribution_gwh": 2600.0 |
| }, |
| { |
| "record_id": "bal-2026-01-15-lng_sendout", |
| "gas_day": "2026-01-15", |
| "component_id": "lng_sendout", |
| "contribution_gwh": 1000.0 |
| }, |
| { |
| "record_id": "bal-2026-01-15-demand", |
| "gas_day": "2026-01-15", |
| "component_id": "demand", |
| "contribution_gwh": -3650.0 |
| }, |
| { |
| "record_id": "bal-2026-01-15-exports", |
| "gas_day": "2026-01-15", |
| "component_id": "exports", |
| "contribution_gwh": -120.0 |
| }, |
| { |
| "record_id": "bal-2026-01-15-storage_net", |
| "gas_day": "2026-01-15", |
| "component_id": "storage_net", |
| "contribution_gwh": -310.0 |
| }, |
| { |
| "record_id": "bal-2026-01-16-domestic_production", |
| "gas_day": "2026-01-16", |
| "component_id": "domestic_production", |
| "contribution_gwh": 475.0 |
| }, |
| { |
| "record_id": "bal-2026-01-16-pipeline_imports", |
| "gas_day": "2026-01-16", |
| "component_id": "pipeline_imports", |
| "contribution_gwh": 2580.0 |
| }, |
| { |
| "record_id": "bal-2026-01-16-lng_sendout", |
| "gas_day": "2026-01-16", |
| "component_id": "lng_sendout", |
| "contribution_gwh": 1020.0 |
| }, |
| { |
| "record_id": "bal-2026-01-16-demand", |
| "gas_day": "2026-01-16", |
| "component_id": "demand", |
| "contribution_gwh": -3620.0 |
| }, |
| { |
| "record_id": "bal-2026-01-16-exports", |
| "gas_day": "2026-01-16", |
| "component_id": "exports", |
| "contribution_gwh": -115.0 |
| }, |
| { |
| "record_id": "bal-2026-01-16-storage_net", |
| "gas_day": "2026-01-16", |
| "component_id": "storage_net", |
| "contribution_gwh": -340.0 |
| }, |
| { |
| "record_id": "bal-2026-01-17-domestic_production", |
| "gas_day": "2026-01-17", |
| "component_id": "domestic_production", |
| "contribution_gwh": 470.0 |
| }, |
| { |
| "record_id": "bal-2026-01-17-pipeline_imports", |
| "gas_day": "2026-01-17", |
| "component_id": "pipeline_imports", |
| "contribution_gwh": 2550.0 |
| }, |
| { |
| "record_id": "bal-2026-01-17-lng_sendout", |
| "gas_day": "2026-01-17", |
| "component_id": "lng_sendout", |
| "contribution_gwh": 980.0 |
| }, |
| { |
| "record_id": "bal-2026-01-17-demand", |
| "gas_day": "2026-01-17", |
| "component_id": "demand", |
| "contribution_gwh": -3600.0 |
| }, |
| { |
| "record_id": "bal-2026-01-17-exports", |
| "gas_day": "2026-01-17", |
| "component_id": "exports", |
| "contribution_gwh": -110.0 |
| }, |
| { |
| "record_id": "bal-2026-01-17-storage_net", |
| "gas_day": "2026-01-17", |
| "component_id": "storage_net", |
| "contribution_gwh": -290.0 |
| } |
| ], |
| "prior_cargo_book": [ |
| { |
| "cargo_id": "cargo-501", |
| "imo": "9100005", |
| "voyage_id": "voyage-501", |
| "quantity_gwh": 1000.0, |
| "included_in_prior_balance": true, |
| "discharge_legs": [ |
| { |
| "leg_id": "prior-leg-501", |
| "terminal_id": "FR-DKK", |
| "included_in_scope": true, |
| "arrival_time": "2026-01-15T08:00:00Z", |
| "discharge_fraction": 1.0, |
| "sendout_profile": [ |
| { |
| "gas_day": "2026-01-15", |
| "gwh": 200.0 |
| }, |
| { |
| "gas_day": "2026-01-16", |
| "gwh": 500.0 |
| }, |
| { |
| "gas_day": "2026-01-17", |
| "gwh": 300.0 |
| } |
| ] |
| } |
| ] |
| } |
| ], |
| "observations": [ |
| { |
| "observation_id": "obs-501", |
| "event_time": "2026-01-14T10:00:00Z", |
| "received_at": "2026-01-14T10:01:00Z", |
| "source": "terminal_nomination", |
| "kind": "split_discharge", |
| "subject": { |
| "imo": "9100005", |
| "voyage_id": "voyage-501" |
| }, |
| "value": { |
| "terminal_id": "FR-DKK", |
| "arrival_time": "2026-01-15T08:00:00Z", |
| "discharge_fraction": 0.4 |
| }, |
| "supersedes_observation_id": null, |
| "retracted": false |
| }, |
| { |
| "observation_id": "obs-502", |
| "event_time": "2026-01-14T10:05:00Z", |
| "received_at": "2026-01-14T10:06:00Z", |
| "source": "terminal_nomination", |
| "kind": "split_discharge", |
| "subject": { |
| "imo": "9100005", |
| "voyage_id": "voyage-501" |
| }, |
| "value": { |
| "terminal_id": "GB-SOU", |
| "arrival_time": "2026-01-17T08:00:00Z", |
| "discharge_fraction": 0.6 |
| }, |
| "supersedes_observation_id": null, |
| "retracted": false |
| }, |
| { |
| "observation_id": "obs-503", |
| "event_time": "2026-01-14T09:30:00Z", |
| "received_at": "2026-01-14T09:31:00Z", |
| "source": "ais", |
| "kind": "position", |
| "subject": { |
| "imo": "9100005", |
| "voyage_id": "voyage-501" |
| }, |
| "value": { |
| "navigation_state": "underway", |
| "load_state": "laden" |
| }, |
| "supersedes_observation_id": null, |
| "retracted": false |
| } |
| ] |
| } |
|
|
