Pinnacle West has extended its 8%-10% annual sales growth outlook through 2030 as manufacturing, data centres and residential expansion reshape Arizona’s electricity demand. The plan points to a large investment cycle, but also greater financing and regulatory execution demands.
- 2026 and long-term sales growth guidance lifted to 8%-10%
- Customer electricity demand projected to more than double by 2041
- Approximately US$10.35 billion of APS capital expenditure planned for 2025-2028
- APS expects to develop around 15 GW of new resources and 2.6 GW of transmission
- 2025 rate case seeks a US$609 million net revenue increase
Arizona’s power demand is no longer merely growing briskly; Pinnacle West Capital Corporation (NYSE:PNW) now expects sales growth of 8%-10% a year through 2030, extending the range it has set for 2026. The utility’s November investor presentation links that outlook to manufacturing, data centres, residential expansion and other industrial customers, while setting out a capital programme that could materially increase the company’s asset base and financing needs.
Arizona demand outlook drives a larger investment cycle
Arizona Public Service, Pinnacle West’s regulated utility, reported 2026 year-to-date commercial and industrial sales growth of 13.9% and described 11 consecutive quarters of growth within or above its earlier 4%-6% long-term range. The company said committed load had reached 5.8 gigawatts, against a 9.2GW 2026 system peak, with more than 84% of that committed load yet to be served.
The investor materials project customer electricity needs will increase by about 42,000 gigawatt-hours by 2041, more than doubling current demand. Manufacturing and data centres are expected to provide much of the incremental load, although the company said the customer base is diversified across large industrial, residential and traditional commercial and industrial segments. That trajectory builds on the US$10.35 billion capital plan previously outlined for 2025 to 2028.
Generation and transmission projects add scale and complexity
APS’s preferred portfolio identifies roughly 15GW of new resources and 2.6GW of transmission capacity over the planning horizon. Planned generation includes approximately 720 megawatts at Saguaro, 1,280MW at Desert Sun and up to US$440 million to convert the retired Cholla plant to 380MW of natural-gas generation. The company also expects to invest about US$500 million more in the Palo Verde capital programme over the next decade and has spent approximately US$200 million to exercise a buyout option for nearly 100MW of nuclear capacity.
Transmission is another substantial leg of the plan. APS’s 2026-2035 system plan points to more than US$6 billion of cumulative transmission capital expenditure, including more than 600 miles of 345kV-and-above lines and over 300 miles of 230kV lines in the planning period. The company said annual FERC formula-rate recovery and wheeling revenue are intended to support recovery, but the projects remain exposed to permitting, construction, cost and regulatory timing.
Capital plan relies on equity and regulatory recovery
APS’s estimated capital expenditure is US$2.40 billion in 2025, US$2.60 billion in 2026, US$2.65 billion in 2027 and US$2.70 billion in 2028. Those figures exclude the Cholla conversion and incremental spending related to a recently executed data-centre-related agreement, meaning the eventual investment requirement could be higher than the headline US$10.35 billion total.
Pinnacle West’s 2026-2028 financing plan includes approximately US$8 billion of funding, including US$1 billion-US$1.2 billion of incremental parent-company equity. The presentation said about US$920 million had been priced through equity forwards by October 2026 and that a new US$500 million at-the-market programme had been initiated, with approximately US$235 million already priced. The stated objective is to preserve a balanced capital structure while funding rate-base growth, rather than relying solely on debt.
Pending APS rate case remains a near-term variable
The 2025 APS rate case is expected to receive a final decision in December 2026. APS’s updated position seeks a US$609 million net revenue increase, including a proposed US$692 million revenue requirement partly offset by US$83 million of adjustor transfers. The company’s presentation puts the proposed day-one customer net revenue impact at 14.69%, while Arizona Corporation Commission staff and intervenors have proposed materially different positions on return on equity, cost recovery mechanisms and the size of the increase.
Pinnacle West continues to target long-term earnings-per-share growth of 5%-7% from its original 2024 midpoint and says improved formula rates, adjustor mechanisms, customer growth and cost control could support more consistent recovery. Those are company targets and projections, not settled outcomes. The immediate test is whether the rate case, large-load commitments and new infrastructure can move through the regulatory process without weakening affordability or stretching the balance sheet.
Bottom Line?
The growth opportunity is unusually large, but its value will depend on rate-case recovery, customer load actually arriving and how much equity Pinnacle West must issue to build ahead of demand.
Questions in the middle?
- Will the Arizona Corporation Commission approve a rate structure that supports the proposed investment while limiting the immediate customer impact?
- How quickly will the 5.8GW of committed load begin taking service, and how much additional generation and transmission spending will that require?
- Can Pinnacle West fund the expanded build-out while maintaining its investment-grade ratings and limiting dilution from further equity issuance?