F.2d 542, 552-53 (D.C.Cir.1978); City of Detroit, 230 F.2d at 817-818. ELCON also cites the Commission’s 1992 Policy-Statement on incentive ratemaking, which states that the Commission “is free to set rates-[above cost-based rates] to provide incentives so long as there is a correlation between the incentive and the result to be induced.” Incentive Ratemaking for Interstate. Natural Gas Pipelines, Oil Pipelines, and Electric Utilities, 1992 WL 494774, 61 F.E.R.C. ¶ 61,168, 61,594 (1992). ELCON maintains that the new rate design violates the incentive ratemaking case law and the 1992 Policy Statement because it offers increased revenues to all capacity suppliers, regardless of whether they invest in new generation facilities. In EL-CON’s view, the new rate design grants a windfall to existing capacity suppliers at the expense of LSEs and their customers.
In the Initial Order, the Commission explained that the incentive ratemaking cases and the 1992 Policy Statement were inapplicable to the ICAP Demand Curve because they “involved incremental rate increases levied upon all customers,” whereas “ICAP charges are not automatically applied to every sale of power, and they can be avoided by self-supplying or procuring adequate capacity through bilateral contracts.” Initial Order, 103 F.E.R.C. ¶ 61,201, at 61,755. On rehearing, the Commission further explained that although the incentive ratemaking cases “involved proposals to encourage new supplies, as does New York’s ICAP Demand Curve, they were implemented as different types of rates than the instant one and with a different potential impact on ratepayers.” Rehearing Order, 105 F.E.R.C. ¶ 61,108, at 61,620. While the Commission does not explore this difference in detail, the court can “discern a reasoned path” to the Commission’s conclusion, E. Tex. Elec. Coop., Inc. v. FERC, 218 F.3d 750, 755 (D.C.Cir.2000), because the intervening capacity suppliers lay out that path in detail in their brief.
Unlike incentive ratemaking, the ICAP Demand Curve does not impose an incremental rate increase above traditional cost-based rates. “For the rationale of the incentive rate cases to apply here,” the intervening capacity suppliers explain, EL-CON “would need to identify a ‘rate increase’ over and above the rates permitted under the Vertical Demand Curve — rates that [ELCON] concede[s], at least implicitly — fall within the ‘zone of reasonableness’ under the just and reasonable standard.” Br. of Supplier Intervenors at 8. Under the vertical demand curve, ICAP prices ranged from zero to the deficiency charge, or three times the annualized cost of a new peaker' plant. See Initial Order, 103 F.E.R.C. ¶ 61,201, at 61,750. Under the sloped demand curve, ICAP prices range from zero to two times the annualized cost of a new peaker plant. See id. at 61,751. At quantities above 118% of peak load, ICAP prices are higher under the sloped demand curve than under the vertical demand curve, but at quantities equal to or below 118%, ICAP prices are lower under the sloped demand curve than under the vertical demand curve. Compare id. at 61,750 fig. 1 with id. at 61,751 fig. 2. Thus, the intervening capacity suppliers point out, the sloped demand curve does not impose an incremental rate increase.
More important, unlike incentive rate-making, the ICAP Demand Curve encourages investment in new generation capacity by ensuring “increased stability in ICAP revenues,” not higher rates across the board. Id. at 61,758. Instead of granting “above-cost premiums to suppliers of capacity,” Br. of Resp’t at 26, the ICAP Demand Curve restructures ICAP prices to “more realistically reflect!] the economic value of capacity reserves” and to “send better price signals to encourage