Arizona Public Service Company (APS) is soliciting competitive proposals for at least 1,000 MW of resources to meet needs identified through the Integrated Resource Plan (IRP). APS is seeking resources that provide reliable capacity to meet summer peak needs, overnight energy, reserve margin and growing demand needs of extra high load factor (XHLF) customers. Proposals are requested for capacity resources and renewable energy resources providing a minimum of 5 MW with commercial operation dates in 2029, 2030, or 2031 for Power Purchase Agreements (PPA), Build Transfer Agreements (BTA), Engineering, Procurement, and Construction Agreements (EPC), and Load Management Agreements (LMA). The RFP also includes specific opportunities for: (1) Thermal Generation at the APS-owned Desert Sun Power Plant site (approximately 1,660 MW of natural gas fired power generation with four Combustion Turbine Generators - two combined-cycle units nominally rated at 510 MW each and two simple-cycle units nominally rated at 320 MW each); (2) Generating resources within the geographic boundaries of the Navajo Nation; (3) Generating resources within the geographic boundaries of the Hopi Tribe. Eligible FTM resources include: Solar, Energy Storage (including pumped hydro), Wind, Biomass/Biogas, Geothermal, Landfill Gas, Reciprocating Units, Simple cycle combustion turbines, Combined cycle combustion turbines, Hybrid resources (AC coupled), and Nuclear. Eligible BTM resources include: BTM Energy Storage/Demand Response (commercial/industrial) with Managed EV Charging, Energy Storage, Building Energy Management Systems, Inverter Ancillary Capabilities, Commercial Process Loads, and Backup Generators; BTM Energy Storage/Load Shifting/Demand Response (small business and residential) with Smart Thermostats, Water Heating Controls, Pool Pump Controls, Managed EV Charging, and Energy Storage; Energy Efficiency (all segments). Resources must be capable of remote control with APS Automatic Generation Controls (AGC) and interface with APS's Energy Management System (EMS). APS strongly prefers PPAs that qualify for operating lease treatment. APS requires all costs to be included in Proposal pricing including interconnection network upgrade costs, financing costs, energy delivery costs, project direct interconnection costs, and provision of required collateral. For BTM resources, pricing must be inclusive of all customer marketing, recruitment, enrollment, technology installation, provisioning, O&M, and costs associated with measurement and verification. Respondents must demonstrate sufficient site control or program commitment. For Near-Term Opportunities on state-owned land, Respondents must demonstrate scheduled lease approval on the AZ State Land Board of Appeals Meeting Notice. APS requires compliance with all technical requirements including NERC Reliability Standards, IEEE 2800-2022 Standard for IBRs, safety requirements (particularly for BESS per Appendix W), and operational requirements specific to each technology type. The evaluation process consists of initial screening for completeness, quantitative/qualitative analysis (shortlist process) using a scoring matrix, portfolio evaluation considering fit relative to existing resources and system reliability, and final evaluation and selection. Proposals will be scored on: Resource Alignment (Dispatchability 100 pts, Carbon Emissions Profile 100 pts, Load Factor Impacts 100 pts, Flexibility 100 pts, Water Source 50 pts, Water Use Intensity 50 pts = 500 pts total, 24.4% weightage); Technology/Project Risk (Site Control 50 pts, Interconnection Status 100 pts, Supply Chain 100 pts = 250 pts total, 12.2% weightage); Respondent Risk (Commercial Experience 150 pts, Safety 50 pts, Financial Strength 50 pts, Cybersecurity Risk 50 pts = 300 pts total, 14.6% weightage); Cost (Reliable LCOC 500 pts, LCOE 500 pts = 1000 pts total, 48.8% weightage). APS reserves the right to select or not select one or more Proposals and may reject any Proposal that does not include substantial proposed exceptions to applicable pro forma agreements in the Proposal itself. APS utilizes an Independent Monitor to ensure fairness and integrity of the RFP process.