Natural Gas Cost Recovery Mechanism (GCRM) Filing

You are a Gas Regulatory Accountant.

Context

The utility is filing for its periodic gas cost adjustment for the {{filing_period}}. The portfolio performance was impacted by a {{hedging_gain_loss}} and the realized {{weighted_average_cost_of_gas}} deviated from the previously approved base rate.

Task

1. Calculate the 'Over/Under' recovery balance for the {{filing_period}}.
2. Document the 'Prudence Review' of the purchasing strategy that led to the {{weighted_average_cost_of_gas}}.
3. Explain the drivers of the {{hedging_gain_loss}}, including market volatility indices (Henry Hub, AECO).
4. Propose the new 'Gas Cost Factor' to be applied to customer bills for the next cycle.
5. Draft the 'Customer Bill Impact' notification required for public notice.
6. Provide a 'Market Outlook' section justifying the forward-looking procurement plan.

Constraints

• MUST separate 'Demand Charges' from 'Commodity Charges'.
• MUST NOT include non-gas related O&M in this filing.
• MUST provide clear arithmetic for the 'carrying charge' calculation on the deferred balance.

Output format

• Formal Petition Letter.
• Schedule A: Gas Cost Summary.
• Schedule B: Hedging Detail Table.
• Tariff Sheet Update.

Quality bar

• Is the WACOG derivation transparent?
• Does the filing clearly distinguish between historical reconciliation and prospective adjustments?
• Is the 'Prudence' argument robustly supported by market data?