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Federal Register / Vol. 86, No. 165 / Monday, August 30, 2021 / Notices
The numerator consists of the annual revenue requirement for generation multiplied by the percentage of resource capacity used for providing VAR
Support Service. That percentage is based on the nameplate power factor one minus the power factor for the generating units supplying the service within WALC. The denominator consists of the transmission transactions within WALC that require this service.
Based on the formula rate, the charge will be calculated each fiscal year using updated financial and reservation data.
The charge will be effective on October 1st of each year and will be posted on WALCs website.

Rate Schedule DSWFR4

Applicable
SCHEDULE 3 to OATT

Regulation and Frequency Response Service Regulation Service is necessary to provide for the continuous balancing of resources, generation and interchange, with load, and for maintaining scheduled interconnection frequency at sixty cycles per second 60
Hz. The obligation to maintain this balance between resources and load lies with the Transmission Service Provider TSP or the Balancing Authority BA
who performs this function for the TSP.
The Western Area Lower Colorado Balancing Authority WALC performs this function for the Federal TSPs and must offer this service when transmission is used to serve load within its Balancing Authority Area BA
Area. Non-Federal TSPs and customers of Federal TSPs must purchase Regulation Service from WALC or make alternative comparable arrangements to satisfy their regulation obligations.

Supersedes Rate Schedule DSWFR3
dated October 1, 2016, through September 30, 2021
United States Department of Energy Western Area Power Administration Desert Southwest Region and Western Area Lower Colorado Balancing Authority Regulation and Frequency Response Service Approved Under Rate Order No.
WAPA175
Effective The first day of the first full billing period beginning on or after October 1, 2016, and extending through September 30, 2021, or until superseded by another rate schedule, whichever occurs earlier.
Note: This rate schedule was extended by Rate Order No. WAPA200 through September 30, 2026.

Formula Rate
Annual Revenue Requirement for Regulation Service Load within W ALC Requiring Regulation
Regulation Service Rate
+ Installed Nameplate Capacity of Solar Generators Serving Load within W ALC x Solar Capacity Multiplier
+

The numerator includes the annual costs associated with plant-in-service, operation and maintenance, purchase of regulation products, purchases of power to support WALCs ability to regulate, and other related costs involved in providing the service. The denominator consists of the load within WALC that requires this service plus the product of the installed nameplate capacity of solar and wind generators serving load within WALC and the applicable capacity multipliers.
Based on the formula rate, the charge will be calculated each fiscal year using updated financial and load data. The charge will be effective on October 1st of each year and will be posted on the WALC website.
Types of Assessments There are two different applications of this formula rate:
1 A load-based assessment which is applicable to load within WALC total metered load less Federal power allocation, including behind the meter
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generation rating, or if available, hourly data if generation is synchronized and the installed nameplate capacity of all intermittent resources serving load within WALC.
2 A self-provision assessment which allows entities with Automatic Generation Control AGC to selfprovide for all or a portion of their loads. Entities with AGC are known as Sub-Balancing Authorities SBA and must meet all of the following criteria:
a Have a well-defined boundary, with WALC-approved revenue-quality metering, accurate as defined by the North American Electric Reliability Corporation NERC, to include Megawatt MW flow data availability at 6-second or smaller intervals; b have AGC responsive units; c demonstrate Regulation Service capability; and d execute a contract with WALC, provide all requested data, and meet the SBA
error criteria below.
Self-provision is measured by use of the entitys 1-minute average Area Control Error ACE to determine the
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amount of self-provision. The ACE is used to calculate the Regulation Service charges every hour as follows:
1 If the entitys 1-minute average ACE for the hour is less than or equal to 0.5 percent of its hourly average load, no charge is assessed for that hour.
2 If the entitys 1-minute average ACE for the hour is greater than or equal to 1.5 percent of the entitys hourly average load, WALC assesses charges using the hourly load-based assessment applied to the entitys peak load for that month.
3 If the entitys 1-minute average ACE for the hour is greater than 0.5
percent but less than 1.5 percent of its hourly average load, WALC assesses charges based on linear interpolation of no charge and full charge, using the hourly load-based assessment applied to the entitys peak load for that month.
WALC monitors the entitys selfprovision on a regular basis. If WALC
determines that the entity has not been attempting to self-regulate, WALC will, upon notification, employ the load-

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Installed Nameplate Capacity of Wind Generators Serving Load within W ALC x Wind Capacity Multiplier