Transcription notes recorded when this tariff was encoded, including anything deliberately left out.
NINE ADJUSTMENT SCHEDULES APPLY, and the obvious five are not all of them. R-1's own ADJUSTMENTS list names REAC-1, PSA-1, TCA-1, DSMAC-1, LFCR, CRS-1, SRB-1, RCDAC-1 and TEAM. A first pass found five by guessing at filenames; CRS-1 (0.001480/kWh) and SRB-1 (0.000000) would both have been missed. The zeros are carried deliberately so that a future non-zero value appears as a change rather than as an absence.
RCDAC-1 is not encoded: it applies only to Direct Access customers returning to Standard Offer service, which is not ordinary residential service. Arizona taxes and governmental fees are also excluded, being jurisdiction-specific.
THE THREE R-1 VARIANTS ARE NOT USAGE TIERS. A customer is assigned to small, medium or large by their ANNUAL AVERAGE monthly consumption, which APS reviews each January - not by where usage falls within a month. Encoding them as an energy tier structure would misprice every bill.
THE RENEWABLE ADJUSTMENT IS CAPPED and this schema cannot express that. REAC-1 is $0.006214/kWh subject to a residential cap of $2.49 per account per month, so the cap binds above about 401 kWh. It is encoded as a flat $2.49 monthly charge.
The System Benefits Charge of $0.00361/kWh is printed as an unbundled COMPONENT of the bundled energy charge, and the sheet says 'These are not additional charges'. It is already inside the energy rate and must not be added.
TWO EFFECTIVE DATES. Base rates are from Decision No. 79293, effective 2024-03-08, and only change in a rate case. The adjustors move on their own cycles - TCA took effect 2026-06-01, REAC 2026-03-01, PSA 2026-02-01, DSMAC 2026-01-01, LFCR 2025-12-01 - so the tariff is dated by the latest of them.
THE BASE CHARGES RECONCILE EXACTLY. APS prints the unbundled components of every bundled charge, and all six - three tiers x daily and per-kWh - sum to the printed figure. A mistyped base rate fails the build.
THE ALL-IN RATE DOES NOT. APS publishes no total including its adjustors and no typical bill at a stated usage was found, so the eleven adjustment components on top are each read from their own filed schedule but are not checked against any published sum.
IT IS NOT ESTABLISHED THAT R-1 IS THE DEFAULT PLAN. The sheet never uses the word, and APS publishes at least seven residential plans. This is one plan among several rather than the one most customers are on.
THE SMALL TIER, for customers whose annual average monthly usage of 600 kWh or less.
$0.362 per DAY basic service charge - filed per day, not per month, so a 31-day month costs more than a 28-day one.
$0.12925 base energy plus 0.027029 of adjustors = $0.156279/kWh, and $2.49/month for the capped renewable adjustment.
Flat within the month: no time-of-use, no seasons, no demand charge. APS's other residential plans are time-of-use.
THE REAC ENCODING CAN OVERSTATE FOR THIS TIER. Small-tier customers average 600 kWh or less, so a month below 401 kWh pays less than the $2.49 cap. The overstatement is bounded by $2.49 and is smaller in practice.
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Change history
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