Official information · review dates · related pages
Sources behind our calculators and guides
Find the official documents behind our 7 calculators and 8 guides. Each entry shows when we checked it, which pages use it, and any limits or conflicting information we found.
Direct source records
“Checked” means the cited document was opened and compared with the affected page on that date. It does not guarantee a utility or agency will leave the document unchanged. Effective dates and status notes identify the next likely recheck.
Income-Qualified Discount: enrollment, M-Power and annual renewal
- Effective / version
- Current web instructions checked September 13, 2026
- Last checked
- 2026-09-13
Pages using this source
Application guidance only. Household-size dollar limits conflict with the credit-policy PDF; those figures are withheld and readers are directed to SRP for confirmation. No eligibility decision or approval time promised.
Read the original documentIncome-Qualified Discount paper application
- Effective / version
- Form 2619750, revision 07/25; linked by current program page
- Last checked
- 2026-09-13
Pages using this source
Supports the paper-field checklist, return methods and 60-day income-proof instruction. Required document types and date ranges must be confirmed with SRP; no application submitted.
Read the original documentResidential credit policy: limited-income provisions
- Effective / version
- Current HTML policy checked September 13, 2026; limited-income section only
- Last checked
- 2026-09-13
Pages using this source
Supports account, residence, household-income and verification requirements and the $35/$10 benefit tiers. Dollar eligibility table is not republished because the PDF differs. No disconnection-policy interpretation.
Read the original document2026 residential credit policy: conflicting income table
- Effective / version
- 2026 PDF, x23-003 FF 04/26; limited-income provisions on page 2
- Last checked
- 2026-09-13
Pages using this source
PDF and program HTML disagree on household-size dollar limits. The guide discloses the conflict, omits those limits and routes eligibility questions to SRP. Do not resolve the conflict by assuming one document is current from its date alone.
Read the original documentOnline discount application: My Account sign-in entry
- Effective / version
- Entry screen observed September 13, 2026
- Last checked
- 2026-09-13
Pages using this source
Only the public sign-in entry was inspected. No authenticated application screens, submission or account data were accessed.
Read the original documentEnergy-saving projects: renter actions and repair requests
- Effective / version
- July 16, 2026 article; renter section only
- Last checked
- 2026-09-11
Pages using this source
Supports basic household actions. No quoted percentage or dollar savings, equipment recommendation, rebate claim or universal thermostat setting. Step order and maintenance message are editorial.
Read the original documentLow- to no-cost energy tips for rental homes
- Effective / version
- Current web guidance; no publication date stated
- Last checked
- 2026-09-11
Pages using this source
Supports basic household actions. No quoted percentage or dollar savings, equipment recommendation, rebate claim or universal thermostat setting. Step order and maintenance message are editorial.
Read the original documentSummer cooling: shades, airflow and equipment maintenance
- Effective / version
- July 1, 2021 guidance; basic cooling principles only
- Last checked
- 2026-09-11
Pages using this source
Supports basic household actions. No quoted percentage or dollar savings, equipment recommendation, rebate claim or universal thermostat setting. Step order and maintenance message are editorial.
Read the original documentEnergy Saver 2022: Home Cooling, printed pages 17–18
- Effective / version
- 2022 edition; fan use and household comfort guidance only
- Last checked
- 2026-09-11
Pages using this source
Supports basic household actions. No quoted percentage or dollar savings, equipment recommendation, rebate claim or universal thermostat setting. Step order and maintenance message are editorial.
Read the original documentHome Energy Assessment: rental eligibility and virtual/in-home fees
- Effective / version
- Current web terms checked September 11, 2026
- Last checked
- 2026-09-11
Pages using this source
Small rentals require property manager approval; communities with five or more units use the multifamily route. Virtual free; in-home $49 unless income-qualified for free. SRP must confirm individual eligibility and cost.
Read the original documentResidential Time-of-Use, tariff 102 (TRREST)
- Effective / version
- Original sheets effective September 1, 2023; current utility-linked documents
- Last checked
- 2026-09-11
Pages using this source
Schedule and billing-structure review only: summer/winter windows, six holidays and observed weekdays; maximum one-hour on-peak demand for 103/104. No cents-per-kWh values, riders, solar treatment or whole-bill estimate modeled. Recheck before extending dated holiday table beyond 2026.
Read the original documentResidential Peak Demand, tariff 103 (TRRESD)
- Effective / version
- Original sheets effective September 1, 2023; current utility-linked documents
- Last checked
- 2026-09-11
Pages using this source
Schedule and billing-structure review only: summer/winter windows, six holidays and observed weekdays; maximum one-hour on-peak demand for 103/104. No cents-per-kWh values, riders, solar treatment or whole-bill estimate modeled. Recheck before extending dated holiday table beyond 2026.
Read the original documentResidential Demand Time-of-Use, tariff 104 (TRRESDT)
- Effective / version
- Original sheets effective September 1, 2023; current utility-linked documents
- Last checked
- 2026-09-11
Pages using this source
Schedule and billing-structure review only: summer/winter windows, six holidays and observed weekdays; maximum one-hour on-peak demand for 103/104. No cents-per-kWh values, riders, solar treatment or whole-bill estimate modeled. Recheck before extending dated holiday table beyond 2026.
Read the original documentTime-of-Use schedule and flexible appliance use
- Effective / version
- Current web guidance checked September 11, 2026
- Last checked
- 2026-09-11
Pages using this source
Supports plan distinctions and customer navigation. Tariffs resolve web-table omissions after 9 p.m. in winter and duplicated Memorial Day in demand footnotes. Pricing Planner is conditional, not a guarantee of future bills or lowest cost.
Read the original documentBasic plan: no hourly price change
- Effective / version
- Current web guidance checked September 11, 2026
- Last checked
- 2026-09-11
Pages using this source
Supports plan distinctions and customer navigation. Tariffs resolve web-table omissions after 9 p.m. in winter and duplicated Memorial Day in demand footnotes. Pricing Planner is conditional, not a guarantee of future bills or lowest cost.
Read the original documentPeak Demand: usage versus demand charges
- Effective / version
- Current web guidance checked September 11, 2026
- Last checked
- 2026-09-11
Pages using this source
Supports plan distinctions and customer navigation. Tariffs resolve web-table omissions after 9 p.m. in winter and duplicated Memorial Day in demand footnotes. Pricing Planner is conditional, not a guarantee of future bills or lowest cost.
Read the original documentDemand Time-of-Use: both price windows and demand
- Effective / version
- Current web guidance checked September 11, 2026
- Last checked
- 2026-09-11
Pages using this source
Supports plan distinctions and customer navigation. Tariffs resolve web-table omissions after 9 p.m. in winter and duplicated Memorial Day in demand footnotes. Pricing Planner is conditional, not a guarantee of future bills or lowest cost.
Read the original documentService Information plan name and informational demand readings
- Effective / version
- Current web guidance checked September 11, 2026
- Last checked
- 2026-09-11
Pages using this source
Supports plan distinctions and customer navigation. Tariffs resolve web-table omissions after 9 p.m. in winter and duplicated Memorial Day in demand footnotes. Pricing Planner is conditional, not a guarantee of future bills or lowest cost.
Read the original documentPricing Planner: history requirements and exclusions
- Effective / version
- Current web guidance checked September 11, 2026
- Last checked
- 2026-09-11
Pages using this source
Supports plan distinctions and customer navigation. Tariffs resolve web-table omissions after 9 p.m. in winter and duplicated Memorial Day in demand footnotes. Pricing Planner is conditional, not a guarantee of future bills or lowest cost.
Read the original documentAugust 31, 2026 announcement: hardship assistance through Wildfire
- Effective / version
- Summer 2026 announcement; remaining funding requires agency confirmation
- Last checked
- 2026-09-11
Pages using this source
Up to $800 for eligible hardship cases, first-come while funds last. Supports agency routing and document checklist; does not confirm current funding or individual approval.
Read the original documentCity-based assistance directory, weatherization and heat-relief routes
- Effective / version
- Current web guidance checked September 11, 2026
- Last checked
- 2026-09-11
Pages using this source
Supports the new SRP local-help section only. No income threshold, benefit amount or program availability promised; older source checks retain their own dates.
Read the original documentIncome-Qualified Discount enrollment route and Customer Resource Counselors
- Effective / version
- Current web guidance checked September 11, 2026
- Last checked
- 2026-09-11
Pages using this source
Supports the new SRP local-help section only. No income threshold, benefit amount or program availability promised; older source checks retain their own dates.
Read the original documentBill guides by plan and solar billing type
- Effective / version
- Web guidance read September 7, 2026; not a tariff rate refresh
- Last checked
- 2026-09-07
Pages using this source
Supports bill-reading guidance. Comparison example and call checklist are editorial; no account diagnosis, modeled rate or savings promise.
Read the original documentReading current charges, usage comparisons and solar bill terms
- Effective / version
- Web guidance read September 7, 2026; not a tariff rate refresh
- Last checked
- 2026-09-07
Pages using this source
Supports bill-reading guidance. Comparison example and call checklist are editorial; no account diagnosis, modeled rate or savings promise.
Read the original documentBill adjustors and separate charge explanations
- Effective / version
- Web guidance read September 7, 2026; not a tariff rate refresh
- Last checked
- 2026-09-07
Pages using this source
Supports bill-reading guidance. Comparison example and call checklist are editorial; no account diagnosis, modeled rate or savings promise.
Read the original documentBudget Billing payments and settle-up balances
- Effective / version
- Web guidance read September 7, 2026; not a tariff rate refresh
- Last checked
- 2026-09-07
Pages using this source
Supports bill-reading guidance. Comparison example and call checklist are editorial; no account diagnosis, modeled rate or savings promise.
Read the original documentHigh-usage alerts: possible causes and limits
- Effective / version
- Web guidance read September 7, 2026; not a tariff rate refresh
- Last checked
- 2026-09-07
Pages using this source
Supports bill-reading guidance. Comparison example and call checklist are editorial; no account diagnosis, modeled rate or savings promise.
Read the original documentLIHEAP and Power AZ applications
- Effective / version
- Current web guidance checked September 4, 2026; account terms and funding require confirmation
- Last checked
- 2026-09-04
Pages using this source
Contact and application routing only; no eligibility decision, award amount or disconnection protection is promised. SRP's dated 2025 summer statement is not treated as current policy.
Read the original documentApplicant questions: program overlap, Tribal applications and crisis assistance
- Effective / version
- Current web guidance checked September 4, 2026; account terms and funding require confirmation
- Last checked
- 2026-09-04
Pages using this source
Contact and application routing only; no eligibility decision, award amount or disconnection protection is promised. SRP's dated 2025 summer statement is not treated as current policy.
Read the original documentCommunity Action Agency directory
- Effective / version
- Current web guidance checked September 4, 2026; account terms and funding require confirmation
- Last checked
- 2026-09-04
Pages using this source
Contact and application routing only; no eligibility decision, award amount or disconnection protection is promised. SRP's dated 2025 summer statement is not treated as current policy.
Read the original documentPayment arrangements and contact numbers
- Effective / version
- Current web guidance checked September 4, 2026; account terms and funding require confirmation
- Last checked
- 2026-09-04
Pages using this source
Contact and application routing only; no eligibility decision, award amount or disconnection protection is promised. SRP's dated 2025 summer statement is not treated as current policy.
Read the original documentFinancial assistance contacts and referrals
- Effective / version
- Current web guidance checked September 4, 2026; account terms and funding require confirmation
- Last checked
- 2026-09-04
Pages using this source
Contact and application routing only; no eligibility decision, award amount or disconnection protection is promised. SRP's dated 2025 summer statement is not treated as current policy.
Read the original documentPayment assistance and Customer Care
- Effective / version
- Current web guidance checked September 4, 2026; account terms and funding require confirmation
- Last checked
- 2026-09-04
Pages using this source
Contact and application routing only; no eligibility decision, award amount or disconnection protection is promised. SRP's dated 2025 summer statement is not treated as current policy.
Read the original documentPayment assistance and Customer Care
- Effective / version
- Current web guidance checked September 4, 2026; account terms and funding require confirmation
- Last checked
- 2026-09-04
Pages using this source
Contact and application routing only; no eligibility decision, award amount or disconnection protection is promised. SRP's dated 2025 summer statement is not treated as current policy.
Read the original documentBasic Price Plan: no time-of-day price windows
- Effective / version
- Current Basic plan description; seasonal rates follow meter-read date
- Last checked
- 2026-09-04
Pages using this source
Supports the no-peak-hours answer and distinguishes July–August Summer Peak season from a daily window. No Basic rate calculation or enrollment recommendation.
Read the original documentMonthly Plan Comparison: access and usage-history requirements
- Effective / version
- Current guidance; active plan and at least three months of history at current address
- Last checked
- 2026-09-04
Pages using this source
Retrospective plan comparison, not a verified pre-move address-estimate service. No rate refresh.
Read the original documentAPS customer contact options
- Effective / version
- Current contact page; availability can change
- Last checked
- 2026-09-04
Pages using this source
Supports where to ask about available information. Does not establish access to previous occupants’ records; site checklist and question are editorial suggestions.
Read the original documentView and download energy usage details
- Effective / version
- Current help page; account navigation can change
- Last checked
- 2026-09-04
Pages using this source
Supports finding usage data. Field allocation also uses the separately dated R-TOU-E tariff; no new rates are implied.
Read the original documentHow to read your residential electric bill
- Effective / version
- Current help page; bill layouts can change
- Last checked
- 2026-09-04
Pages using this source
Supports plan location, On-Peak kW Max and energy-field distinctions. The worksheet still requires separate imports/exports; this is not a rate refresh.
Read the original documentResidential time-of-day schedules (ten plans)
- Effective / version
- November 2025 plan definitions; ratebook published April 27, 2026
- Last checked
- 2026-09-04
Pages using this source
Schedule-only review for 2026. Does not refresh rate values. Weekend holiday observation is unresolved for July 3/6; planner withholds a result. Recheck before supporting 2027 or on a plan-change notice.
Read the original documentResidential Time-of-Use 4pm–7pm Weekdays (R-TOU-E)
- Effective / version
- R-TOU-E tariff effective 2024-03-08
- Last checked
- 2026-07-27
Pages using this source
Active model source; customers must confirm their enrolled plan and bill riders.
Read the original documentTime-of-Use 4pm–7pm Weekdays plan guidance
- Effective / version
- Current plan page; customer enrollment determines applicability
- Last checked
- 2026-07-27
Pages using this source
Supports shifting pool-pump use outside the named on-peak window; no rate is embedded.
Read the original documentTOU-E 2026 day checker: timing, holidays and billing seasons
- Effective / version
- Standard TOU-E schedule, tariff revision 3 effective March 8, 2024
- Last checked
- 2026-09-04
Pages using this source
Standard TOU-E timing and 2026 holidays rechecked against this page and tariff revision 3 (effective March 8, 2024). Billing season is not inferred from calendar date. No rate refresh or special-event pricing model is implied.
Read the original documentAPS Resource Comparison Proxy export-purchase rate schedule
- Effective / version
- September 1, 2026 through August 31, 2027
- Last checked
- 2026-09-04
Pages using this source
Revision 11, effective September 1, 2026. Reference for qualifying applications only; use the customer's assigned rate, which may remain locked for 10 years.
Read the original documentStorage Rewards program terms
- Effective / version
- Current program page; no single effective date stated
- Last checked
- 2026-07-27
Pages using this source
Scenario input, not a purchase rebate or guaranteed annual payment.
Read the original document2025 Ratebook with Temporary FPPAM
- Effective / version
- Base prices 2025-11; temporary FPPAM 2026-05 through 2026-10
- Last checked
- 2026-07-27
Pages using this source
Active model source; temporary riders require recheck when their window ends.
Read the original documentCustomer Generation Price Plan
- Effective / version
- Current E-27 plan page; ratebook governs billing terms and prices
- Last checked
- 2026-08-11
Pages using this source
Supports qualitative load-shifting and demand-management context; the worksheet uses ratebook values and user-entered billing data.
Read the original documentPVWatts Calculator
- Effective / version
- PVWatts v8 calculator
- Last checked
- 2026-07-28
Pages using this source
Optional source for a user-entered annual estimate; this site does not transmit calculator inputs to NLR.
Read the original documentResidential Clean Energy Credit guidance
- Effective / version
- Credit unavailable for property placed in service after 2025-12-31
- Last checked
- 2026-07-27
Pages using this source
Model applies $0 federal credit to a new 2026 installation; not tax advice.
Read the original documentPool Pumps product and efficiency guidance
- Effective / version
- Current guidance; no rate effective date
- Last checked
- 2026-07-18
Pages using this source
Supports variable-speed context; calculator values remain user-editable.
Read the original documentSummer energy-saving guidance for pool-pump scheduling
- Effective / version
- Current guidance; no tariff effective date
- Last checked
- 2026-07-27
Pages using this source
Supports schedule context only; equipment and water-care needs vary.
Read the original documentPool pump rebate program page
- Effective / version
- Current program page; eligibility and funding can change
- Last checked
- 2026-07-27
Pages using this source
The current FAQ says the former pool-pump rebate is no longer available; recheck before purchase.
Read the original documentEV fuel-economy testing and charging-loss measurement
- Effective / version
- Page updated July 1, 2026; Level 2 AC charging methodology
- Last checked
- 2026-09-04
Pages using this source
Explains wall-energy measurement and why the EPA mode adds no second loss factor.
Read the original documentElectric-vehicle energy-consumption label guidance
- Effective / version
- Current guidance; vehicle labels are model-specific
- Last checked
- 2026-07-18
Pages using this source
Users enter their vehicle's own efficiency rather than receiving a model default.
Read the original documentAll-Electric Vehicles basics
- Effective / version
- Current overview; no utility-rate effective date
- Last checked
- 2026-07-18
Pages using this source
Supports charging-loss and vehicle-efficiency context, not a promised result.
Read the original documentAPS residential electric-vehicle rate plan page
- Effective / version
- Current plan page; customer enrollment determines applicability
- Last checked
- 2026-07-18
Pages using this source
Reference for plan comparison; the calculator requires a user-entered rate.
Read the original documentSRP residential price-plan comparison
- Effective / version
- Current plan page; customer enrollment determines applicability
- Last checked
- 2026-07-18
Pages using this source
Reference for plan comparison; the calculator requires a user-entered rate.
Read the original documentMeasuring electricity
- Effective / version
- Current explainer; no rate effective date
- Last checked
- 2026-07-27
Pages using this source
Defines the W, Wh, and kWh concepts used by the pure calculation.
Read the original documentPower Outages
- Effective / version
- Current safety guidance
- Last checked
- 2026-07-27
Pages using this source
Safety boundary only; it does not supply appliance or product defaults.
Read the original documentHow a source enters the ledger
- 1. Prefer the owner. Utility tariffs, ratebooks, program terms, federal guidance, and laboratory documentation outrank summaries and search snippets.
- 2. Record scope and time. The entry names the effective period, version, affected routes, and the date the page was checked.
- 3. Resolve conflicting information. If a material number cannot be reconciled to a current direct source, it is removed, made a user input, or the route is retired.
Find a changed tariff or broken link? Use the contact route described on the About page. Include the document owner, URL, and effective date so the affected calculation can be stopped or corrected before publication.