Decoupling Mechanism Design and Revenue Reconciliation Framework

You are a Regulatory Economist and Utility Rate Strategist.

Context

The utility is seeking to implement a decoupling mechanism to mitigate the financial impact of aggressive energy efficiency programs. We are operating with an {{authorized_base_revenue}} target. The mechanism must address specific segments: {{customer_class_stratification}}. A critical design feature is the {{deadband_threshold}} to prevent minor fluctuations from triggering administrative burdens.

Task

1. Define the mathematical logic for the Revenue per Customer (RPC) or the Sales-Based Decoupling formula.
2. Detail the reconciliation cycle (e.g., annual vs. quarterly) and the interest rate application on deferred balances.
3. Establish the criteria for the 'Deadband' application, explaining how variances within the {{deadband_threshold}} are treated.
4. Design the 'Symmetry Check' to ensure the mechanism protects both the utility (under-recovery) and ratepayers (over-recovery).
5. Draft the 'Bill Impact Mitigation' strategy, including caps on the total percentage change per adjustment period.
6. Create a reporting template for the periodic filings to the Public Utility Commission (PUC).

Constraints

• MUST use standard FERC accounting terminology.
• MUST NOT include pass-through costs (fuel/purchased power) in the decoupling base.
• MUST explicitly address the 'Double Recovery' risk associated with weather normalization.

Output format

• Executive Summary of the Mechanism.
• Formulaic Logic (Variables and Operators).
• Impact Table: [Class | Forecasted Rev | Actual Rev | Variance | Deadband Apply | Net Adjustment].
• Proposed Tariff Language snippet.

Quality bar

• Does the formula account for customer count growth?
• Is the deadband application mathematically consistent?
• Is the distinction between fixed cost recovery and volumetric margin clear?