Southwestern Public Service Co

What This Utility Data Tells You

Southwestern Public Service Co is an investor-owned utility operating in New Mexico under EIA identifier 17718. It reports service to approximately 279,501 customer accounts and generated about $1.18 billion in annual electric revenue, with a service footprint spanning 184 ZIP codes. Investor ownership puts this utility under the regulatory authority of the state public utility commission, which reviews its rate requests and reliability record.

In 2023, the average Southwestern Public Service Co customer experienced 256.1 minutes of power interruptions, the industry-standard SAIDI metric (System Average Interruption Duration Index). Excluding major weather events from that total, that lands within the usual 120–180 minute national benchmark band, roughly on par with typical U.S. distribution-utility performance. Over the same period, SAIFI (outage events per customer) was 1.39, putting the typical customer at roughly 1 distinct interruption that year. Strip out major event days (hurricanes, ice storms) and SAIDI falls to 116.4 minutes; the difference from the headline 256.1 shows how much of the outage total came from weather rather than everyday grid issues.

Southwestern Public Service Co has 4 years of continuous EIA reporting on file (2020–2023), enough to read a real trend rather than a single-year snapshot. SAIDI climbed from 111.7 to 256.1 minutes over that window, a shift that can point to worsening weather exposure or delayed grid modernization.