Integrated System Plan
ISP REPORT
See how we're planning for the power system of the future.
What is an Integrated System Plan?
We are one of the first U.S. utilities to shift from an Integrated Resource Plan (IRP) to an Integrated System Plan (ISP). While an IRP focuses solely on generation resources, an ISP plans for the entire power system in one process and integrates a variety of community stakeholder and customer perspectives.
This first ISP serves as a holistic roadmap for the power system of the future. It considers evolving customer needs for reliability, affordability and sustainability while also achieving our 2035 Sustainability Goals.
ISP Actions Progress Reports
See how we have been making progress.
TIME-OF-USE PLANS
Powering smarter energy choices
- Launched SRP Daytime Saver™ Pilot with 1,000 residential participants
- Achieved 24% reduction in on-peak demand and 18% increase in super off-peak usage
- Pilot informed 2025 price process; Board approved new TOU hours in February
- New TOU effective as of Nov. 1, 2025; legacy plans will be discontinued by November 2029
- Education campaign underway
PROGRAMS AND ELECTRIFICATION
Empowering customers to electrify smarter
- Delivered 649,000 megawatt-hours (MWh) of energy savings, 102% of FY25 target
- Enrolled 176 megawatts (MW) of demand response capacity across 102,000-plus devices and 720-plus facilities
- Achieved 116% of FY25 goal for E-Tech program with 21,000 MWh impact
- Committed to launch a residential battery-focused virtual power plant pilot by December 2025
- Introduced new rebates for cool roofs, ENERGY STAR® windows and HVAC tuneups
Learn more about SRP’s customer programs and electrification efforts
EV MANAGEMENT
Charging ahead toward a cleaner future
- 68,000-plus EVs in SRP’s service territory
- 79% enrolled in managed charging
- Smart Charge and Flex Charge pilots completed
- Full active-managed charging program launches in FY27
DISTRIBUTION ENABLEMENT
A roadmap to building the grid of the future
- Advanced distribution management system (ADMS) and distributed energy resource management system (DERMS) deployed in January 2025
- Distribution Enablement Lab launched for real-time testing
- Supports microgrids and virtual power plants
- Interconnection process streamlined for customers
RESOURCE SELECTION
Expanding SRP’s clean energy portfolio
- 2023: 1,300 MW storage and 700 MW solar secured
- 2024: 2,800 MW solar/wind, 3,400 MW storage and 1,400 MW gas
- 2025: New all-source request for proposal (RFP) under evaluation
- Salt River Pumped Storage Project hits 30% design milestone
Read more about SRP’s RFPs through a 2024 news release (Opens in a new tab) , a 2025 news release (Opens in a new tab) or by exploring SRP’s general RFP site
COAL TRANSITION
Leading a responsible energy transition
- Coronado Generating Station (CGS) to convert to natural gas by 2029
- Evaluating long-duration storage and other resource options at or near CGS
- Coordinating with partners on Springerville’s future
PROACTIVE SITING
Planning today for tomorrow’s energy needs
- Advanced land readiness and transmission planning
- Studies identify long-term needs through 2035
REGIONAL TRANSMISSION
Connecting to clean energy across the West
- Advanced regional transmission planning
- Exploring access to wind, geothermal and other renewables
- Collaborating with developers and utilities on interconnections
The why
SRP is currently experiencing changes driven by rapid economic growth, supply chain challenges, regulatory changes, climate change, and the increasing momentum behind decarbonization and electrification.
Given the rapid pace of change in the power industry, minimizing risk and meeting our customers' needs over the next decade will require a complete transformation of the SRP power system, including:
- How, when and where we generate and store electricity
- How we deliver electricity over our transmission and distribution systems
- How we engage with our customers through rate design and customer programs
As part of this transformation, SRP has evolved to an Integrated System Plan which engages hundreds of community representatives while providing key insights and a roadmap to serving our community's energy needs.
Key findings from the 2023 ISP Report
During our ISP analysis, we studied how customer needs, infrastructure buildout and operations could evolve under a wide range of future scenarios and uncertainties. We also learned how our actions can influence reliability, affordability and sustainability.
We will need to double or triple resource capacity over the next decade.
A least-cost energy portfolio combines new renewables with conventional power sources.
We will need to evolve customer programs to help shift consumer behavior.
In a high-load-growth scenario, without firm* power sources, the power system cannot satisfy reliability requirements.
We will need to make significant investments in new and upgraded transmission and distribution infrastructure.
*Firm resources include reliable power sources at all hours and over long durations.
Based on what we learned from the key findings, SRP will need to implement the following System Strategies:
Energy Investments
Invest in renewable resources and storage to manage fuel consumption and drive carbon and water reductions.
Capacity Investments
Invest in firm generation, including natural gas, to support reliability and manage affordability, while also supporting advancement of emerging firm technologies.
Proactive Transmission
Proactively plan to expand transmission infrastructure to enable generator interconnections and load growth.
Distribution Innovation
Ensure distribution grid readiness to maintain reliability and enable customer innovations to drive carbon reductions.
Partnerships & Suppliers
Explore partnerships and supply chain and development solutions that manage cost and availability to meet the pace of transformation.
Evolution of Customer Programs & Pricing
Evolve pricing and customer programs to improve economy-wide carbon reductions and pace infrastructure development, while recognizing customers' diverse needs.
Strategic Investment & Reinforcement of Existing Assets
Reinforce and maximize value of existing infrastructure with strategic investments to manage affordability and ensure future performance, grid security and resilience.
Going forward
By planning for the entire power system within one process, we can identify solutions across the entire system and how those solutions must work together to better serve our customers. Looking ahead, here are some things our customers can expect from us:
- New energy infrastructure to help meet the Valley’s needs
- Increased education about when to consume and conserve energy
- More opportunities for electric vehicle (EV) charging programs
- Expansion of electrification program offerings
Resources
Want to learn more?
Explore our document repository for a full list of available resources from SRP’s ISP process and analysis.
