PQube 3 meter · Treasure Island · Live instrument log
Power Quality
Every voltage sag, swell, transient, and interruption recorded by the island's power-quality meter, published as it happens. These are real instrument readings, not estimates and not outage reports. A brief sag is logged here as a sag, never as an outage.
- Latest event
- Voltage Sag · Sat, Sep 26, 2026, 1:18:54 PM PDT
- Deepest dip
- 0.00% of nominal · Thu, Nov 23, 2023, 4:01:22 PM PST
- Events logged
- 0
- Monitor
- Watching
Why this matters
Why a public meter matters
Outage logs can't see what breaks your equipment. On September 12, 2023, this meter recorded a voltage sag to 0.03% of nominal for 1.8 seconds — deep enough to trip equipment on site. Two days later, SFPUC's official word was that there were “no outages” that day. Both statements were true: outage logs track sustained service loss, not the brief voltage collapses that destroy appliances. Without a power-quality meter, that event officially never happened.
The meter is the only precise public record. In October 2021, island residents told the Board of Supervisors about 6+ hour outages and repeated brownouts. This meter's charts confirmed their account almost exactly: a 6.6-hour outage on October 24, a 32-minute outage on October 27, and six voltage sags that month. Without the instrument, those events are anecdotes; with it, they're evidence.
It's cheap — and the city already agreed. A voltage-only PQube 3 monitor lists at $3,014; the full power analyzer at about $4,837. Five monitoring points across the island's feeders is roughly $15,000–$25,000 one time, with near-zero operating cost — the meter emails its own reports around the clock. SFPUC ordered a monitor for the main island feed in August 2023 and added one to its budget that October. The remaining step is making the data public.
If you felt a flicker or lost power, report the outage so it can be matched against the instrument record.
No events of this type have been recorded yet.
How this log works
A Powerside PQube 3 power-quality meter (serial P3001520) installed at Treasure Island Wines monitors the island's 208 V three-phase service around the clock. When voltage moves outside its configured thresholds, the meter emails an event report with oscilloscope waveforms, and this page publishes it automatically.
Event categories are kept separate on purpose. A voltage sag is a dip that the lights ride through; an interruption means voltage fell to near zero. Conflating the two would inflate outage counts, so this log never does.
The meter is operated by Treasure Island Wines, which forwarded its event alerts to this project for publication as a public power-quality record. If you felt a flicker or lost power, report the outage so it can be matched against the instrument record.