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 · Tue, Oct 13, 2026, 8:10:41 AM PDT
Deepest dip: 0.00% of nominal · Thu, Nov 23, 2023, 4:01:22 PM PST
Events logged: 18
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.

AlertTue, Oct 13, 2026, 8:10:41 AM PDTDirect link

Event magnitude

43.70%

of nominal voltage

Duration

0.766 s

Trigger channel: L3-L1
Trigger threshold: 90.0% of nominal
Nominal: 120 / 208 V
Meter: P3001520

A brief dip below 90% of nominal voltage on one or more phases. The power stayed on; equipment may have flickered. A sag is a brief dip, not an outage: the lights may have flickered, but power stayed on.

Oscilloscope waveform captured during the voltage sag on Tue, Oct 13, 2026, 8:10:41 AM PDT — WAVEFORM CAPTURED BY THE METER · TAP TO VIEW FULL SIZE

RMS plot and per-channel readings

RMS voltage plot for the voltage sag on Tue, Oct 13, 2026, 8:10:41 AM PDT

Min / max readings (full window and event-only)
Channel	Min	Max	Min (event)	Max (event)
N-E	0.07V	0.07V	0.07V	0.07V
L1-N	111.2V	122.8V	111.2V	120.1V
L2-N	71.6V	123.1V	71.6V	122.2V
L3-N	72.2V	122.6V	72.2V	112.9V
L1-L2	172.3V	211.9V	172.3V	209.5V
L2-L3	90.9V	212.7V	90.9V	199.9V
L3-L1	173.6V	213.6V	173.6V	206.3V
L1 Amp	12.85A	18.79A	12.85A	18.79A
L2 Amp	4.67A	15.67A	4.67A	15.67A
L3 Amp	4.12A	7.45A	4.12A	7.45A
N Amp	2.61A	4.63A	2.61A	4.63A
L6 Amp	2.795A	8.145A	2.795A	8.145A
L7 Amp	2.761A	8.088A	2.761A	8.088A
L8 Amp	1.088A	2.967A	1.088A	2.967A
Frequency	60.005Hz	60.019Hz	60.008Hz	60.019Hz
Power	2.108kW	4.165kW	2.108kW	3.879kW

Voltage SagSat, Sep 26, 2026, 1:18:54 PM PDTDirect link

Event magnitude

85.22%

of nominal voltage

Duration

0.017 s (about one 60 Hz cycle)

Trigger channel: L1-N
Trigger threshold: 90.0% of nominal
Nominal: 120 / 208 V
Meter: P3001520

Oscilloscope waveform captured during the voltage sag on Sat, Sep 26, 2026, 1:18:54 PM PDT — WAVEFORM CAPTURED BY THE METER · TAP TO VIEW FULL SIZE

RMS plot and per-channel readings

RMS voltage plot for the voltage sag on Sat, Sep 26, 2026, 1:18:54 PM PDT

Min / max readings (full window and event-only)
Channel	Min	Max	Min (event)	Max (event)
N-E	0.07V	0.07V	0.07V	0.07V
L1-N	102.3V	121.6V	102.3V	112.5V
L2-N	120.3V	133.7V	127.7V	133.7V
L3-N	120.5V	122.3V	121.5V	122.3V
L1-L2	202.0V	209.1V	202.0V	205.5V
L2-L3	209.1V	209.9V	209.1V	209.5V
L3-L1	208.1V	210.1V	208.1V	209.4V
L1	Amp	11.59A	17.96A	11.59A
L2	Amp	11.73A	17.44A	12.92A
L3	Amp	7.77A	11.09A	7.77A
N	Amp	6.85A	14.07A	8.77A
L6	Amp	4.880A	5.819A	4.880A
L7	Amp	4.834A	5.774A	4.834A
L8	Amp	2.406A	3.987A	2.406A
Frequency	60.000Hz	60.020Hz	60.000Hz	60.011Hz
Power	3.429kW	3.988kW	3.429kW	3.988kW

AlertMon, Jul 21, 2025, 4:07:13 AM PDTDirect link

Event magnitude

0.00%

of nominal voltage

Duration

279.4 min

Trigger channel: L2-L3
Trigger threshold: 90.0% of nominal
Nominal: 120 / 208 V
Meter: P3001520

Oscilloscope waveform captured during the voltage sag on Mon, Jul 21, 2025, 4:07:13 AM PDT — WAVEFORM CAPTURED BY THE METER · TAP TO VIEW FULL SIZE

RMS plot and per-channel readings

RMS voltage plot for the voltage sag on Mon, Jul 21, 2025, 4:07:13 AM PDT

Min / max readings (full window and event-only)
Channel	Min	Max	Min (event)	Max (event)
N-E	0.04V	0.11V	0.04V	0.11V
L1-N	0.0V	122.7V	0.0V	122.7V
L2-N	0.0V	121.4V	0.0V	121.3V
L3-N	0.0V	119.4V	0.0V	111.4V
L1-L2	0.0V	210.9V	0.0V	210.9V
L2-L3	0.0V	207.6V	0.0V	205.6V
L3-L1	0.0V	207.7V	0.0V	207.7V
L1 Amp	0.09A	51.99A	0.09A	51.99A
L2 Amp	0.00A	31.32A	0.00A	31.32A
L3 Amp	0.00A	42.89A	0.00A	42.89A
N Amp	0.18A	52.92A	0.18A	52.92A
L6 Amp	0.000A	0.218A	0.000A	42.454A
L7 Amp	0.000A	0.229A	0.000A	28.662A
L8 Amp	3.620A	14.583A	0.046A	35.065A
Frequency	59.827Hz	60.033Hz	59.917Hz	60.033Hz
Power	-0.040kW	7.688kW	-0.040kW	7.688kW

InterruptionThu, Nov 23, 2023, 4:01:22 PM PSTDirect link

Voltage remaining

0.00%

of nominal voltage

Duration

1.96 s

Trigger channel: L1-N
Trigger threshold: 10.0% of nominal
Nominal: 120 / 208 V
Meter: P3001520

Voltage dropped to near zero: a genuine loss of power for the duration measured.

Oscilloscope waveform captured during the interruption on Thu, Nov 23, 2023, 4:01:22 PM PST — WAVEFORM CAPTURED BY THE METER · TAP TO VIEW FULL SIZE

RMS plot and per-channel readings

RMS voltage plot for the interruption on Thu, Nov 23, 2023, 4:01:22 PM PST

Min / max readings (full window and event-only)
Channel	Min	Max	Min (event)	Max (event)
N-E	0.04V	0.14V	0.04V	0.14V
L1-N	0.0V	120.0V	0.0V	60.5V
L2-N	0.0V	120.3V	0.0V	47.7V
L3-N	0.0V	120.2V	0.0V	23.0V
L1-L2	0.0V	208.2V	0.0V	99.4V
L2-L3	0.0V	212.8V	0.0V	127.4V
L3-L1	0.0V	211.7V	0.0V	117.1V
L1	Amp	0.00A	69.47A	0.00A
L2	Amp	0.00A	73.93A	0.00A
L3	Amp	0.16A	89.35A	0.16A
N	Amp	0.00A	18.63A	0.00A
L6	Amp	0.000A	58.721A	0.000A
L7	Amp	0.046A	72.411A	0.046A
L8	Amp	0.000A	75.366A	0.000A
Frequency	59.896Hz	60.017Hz	59.901Hz	59.901Hz
Power	-0.121kW	22.426kW	-0.004kW	2.804kW
Jim	Mirowski	Treasure	Island	Wines
Tasting	Room	(Est	2007)	www.tiwines.com

InterruptionSun, Sep 24, 2023, 12:42:52 PM PDTDirect link

Voltage remaining

0.00%

of nominal voltage

Duration

1.93 s

Trigger channel: Not recorded
Trigger threshold: 10.0% of nominal
Nominal: 120 / 208 V
Meter: P3001520

Voltage dropped to near zero: a genuine loss of power for the duration measured.

AlertSun, Sep 24, 2023, 12:42:51 PM PDTDirect link

Event magnitude

0.00%

of nominal voltage

Duration

2.06 s

Trigger channel: Not recorded
Trigger threshold: 90.0% of nominal
Nominal: 120 / 208 V
Meter: P3001520

AlertTue, Sep 12, 2023, 11:04:07 AM PDTDirect link

Event magnitude

0.03%

of nominal voltage

Duration

1.82 s

Trigger channel: L2-L3
Trigger threshold: 90.0% of nominal
Nominal: 120 / 208 V
Meter: P3001520

RMS plot and per-channel readings

Min / max readings (full window and event-only)
Channel	Min	Max	Min (event)	Max (event)
N-E	0.07V	0.11V	0.07V	0.11V
L1-N	2.5V	125.5V	2.5V	125.5V
L2-N	0.1V	119.7V	0.1V	119.7V
L3-N	0.0V	123.3V	0.0V	123.3V
L1-L2	0.1V	213.7V	0.1V	213.7V
L2-L3	1.6V	207.1V	1.6V	207.1V
L3-L1	1.7V	217.6V	1.7V	217.6V
L1	16.31A	16.40A	16.31A	16.38A
L2	12.49A	12.62A	12.51A	12.62A
L3	19.93A	20.23A	19.93A	20.23A
N	10.04A	10.24A	10.04A	10.24A
L6	0.000A	0.000A	0.000A	0.000A
L7	0.000A	0.046A	0.000A	0.046A
L8	3.356A	3.723A	3.356A	3.723A
Frequency	60.022Hz	60.028Hz	60.026Hz	60.026Hz
Power	-0.189kW	5.733kW	-0.189kW	5.660kW

Voltage SagSun, Oct 31, 2021, 6:10:00 PM PDTDirect link

Event magnitude

83.01%

of nominal voltage

Duration

0.033 s (about one 60 Hz cycle)

Trigger channel: Not recorded
Trigger threshold: 90.0% of nominal
Nominal: 120 / 208 V
Meter: P3001520

Voltage SagSun, Oct 31, 2021, 6:47:27 AM PDTDirect link

Event magnitude

74.48%

of nominal voltage

Duration

0.042 s (about one 60 Hz cycle)

Trigger channel: Not recorded
Trigger threshold: 90.0% of nominal
Nominal: 120 / 208 V
Meter: P3001520

InterruptionWed, Oct 27, 2021, 7:02:45 AM PDTDirect link

Voltage remaining

0.00%

of nominal voltage

Duration

32.0 min

Trigger channel: Not recorded
Trigger threshold: 10.0% of nominal
Nominal: 120 / 208 V
Meter: P3001520

Voltage dropped to near zero: a genuine loss of power for the duration measured.

AlertWed, Oct 27, 2021, 7:02:45 AM PDTDirect link

Event magnitude

0.00%

of nominal voltage

Duration

32.0 min

Trigger channel: Not recorded
Trigger threshold: 90.0% of nominal
Nominal: 120 / 208 V
Meter: P3001520

AlertWed, Oct 27, 2021, 2:07:07 AM PDTDirect link

Event magnitude

69.82%

of nominal voltage

Duration

0.050 s

Trigger channel: Not recorded
Trigger threshold: 90.0% of nominal
Nominal: 120 / 208 V
Meter: P3001520

InterruptionSun, Oct 24, 2021, 8:23:19 PM PDTDirect link

Voltage remaining

0.00%

of nominal voltage

Duration

393.8 min

Trigger channel: Not recorded
Trigger threshold: 10.0% of nominal
Nominal: 120 / 208 V
Meter: P3001520

Voltage dropped to near zero: a genuine loss of power for the duration measured.

AlertSun, Oct 24, 2021, 8:23:19 PM PDTDirect link

Event magnitude

0.00%

of nominal voltage

Duration

393.8 min

Trigger channel: Not recorded
Trigger threshold: 90.0% of nominal
Nominal: 120 / 208 V
Meter: P3001520

AlertSun, Oct 24, 2021, 11:54:57 AM PDTDirect link

Event magnitude

41.94%

of nominal voltage

Duration

0.042 s (about one 60 Hz cycle)

Trigger channel: Not recorded
Trigger threshold: 90.0% of nominal
Nominal: 120 / 208 V
Meter: P3001520

AlertWed, Oct 20, 2021, 6:47:52 PM PDTDirect link

Event magnitude

60.98%

of nominal voltage

Duration

0.083 s

Trigger channel: Not recorded
Trigger threshold: 90.0% of nominal
Nominal: 120 / 208 V
Meter: P3001520

AlertTue, Oct 5, 2021, 7:39:07 AM PDTDirect link

Event magnitude

57.85%

of nominal voltage

Duration

0.092 s

Trigger channel: Not recorded
Trigger threshold: 90.0% of nominal
Nominal: 120 / 208 V
Meter: P3001520

AlertSat, Jun 12, 2021, 2:57:47 PM PDTDirect link

Event magnitude

0.00%

of nominal voltage

Duration

4.77 s

Trigger channel: L1-N
Trigger threshold: 90.0% of nominal
Nominal: 120 / 208 V
Meter: P3001520

RMS plot and per-channel readings

Min / max readings (full window and event-only)
Channel	Min	Max	Min (event)	Max (event)
N-E	0.07V	34.53V	0.07V	34.53V
L1-N	0.0V	123.8V	0.0V	123.8V
L2-N	0.0V	119.1V	0.0V	118.0V
L3-N	0.0V	119.2V	0.0V	119.0V
L1-L2	0.0V	207.0V	0.0V	205.9V
L2-L3	0.0V	206.6V	0.0V	205.4V
L3-L1	0.0V	207.8V	0.0V	207.3V
L1	11.46A	11.66A	11.48A	11.62A
L2	10.42A	10.56A	10.45A	10.56A
L3	18.90A	19.04A	18.92A	19.02A
N	12.90A	13.13A	12.92A	13.08A
L6	0.09A	0.14A	N/A	N/A
L7	0.09A	0.11A	N/A	N/A
L8	0.09A	0.14A	N/A	N/A
Frequency	0.000Hz	59.997Hz	59.994Hz	59.996Hz
Power	0.000kW	4.737kW	0.000kW	4.704kW

PQube 3 meter · Monthly trend reports

Monthly trends

Month-long statistical summaries from the same meter — minimum, average, and maximum for each measured channel, plus the meter's own trend charts. These are summaries, not events: a rough month here means consistently poor power quality, while the event log above records individual disturbances.

September 2026 summary

100% coverage

PQube 3 · Serial P3001520 · Treasure Island Wines · PDT

Line-to-neutral · min/avg/max: 102.3V / 121.0V / 133.7V
Line-to-line · min/avg/max: 196.9V / 209.6V / 214.6V
Frequency · min/avg/max: 59.904Hz / 59.999Hz / 60.059Hz
Voltage THD · min/avg/max: 1.05% / 1.87% / 4.66%
Energy this month: 4.586MWh
Apparent energy this month: 5.121MVAh

Trend charts

Line-to-neutral voltages — September 2026 — Line-to-neutral voltages

ITIC curve — event magnitudes vs. duration — September 2026 — ITIC curve — event magnitudes vs. duration

Power trends — September 2026 — Power trends

Line-to-line voltages — September 2026 — Line-to-line voltages

Voltage and current trends — September 2026 — Voltage and current trends

Per-circuit current trends — September 2026 — Per-circuit current trends

Per-circuit power trends — September 2026 — Per-circuit power trends

THD and unbalance trends — September 2026 — THD and unbalance trends

Flicker trends — September 2026 — Flicker trends

All 49 channels — min / avg / max

Channel	Min	Avg	Max
L-N RMS 1/2 (1-cyc)	102.3V	121.0V	133.7V
L1-N RMS 1/2 (1-cyc)	102.3V	121.5V	127.2V
L2-N RMS 1/2 (1-cyc)	114.4V	120.8V	133.7V
L3-N RMS 1/2 (1-cyc)	113.4V	120.8V	122.9V
N-E RMS 1/2 (1-cyc)	0.04V	0.04V	0.25V
L-L RMS 1/2 (1-cyc)	196.9V	209.6V	214.6V
L1-L2 RMS 1/2 (1-cyc)	196.9V	209.1V	212.6V
L2-L3 RMS 1/2 (1-cyc)	202.5V	209.7V	214.6V
L3-L1 RMS 1/2 (1-cyc)	199.6V	210.2V	213.9V
Current RMS 1/2 (1-cyc)	3.57A	19.57A	207.90A
L1 Current RMS 1/2 (1-cyc)	11.25A	24.51A	207.90A
L2 Current RMS 1/2 (1-cyc)	4.47A	22.32A	200.86A
L3 Current RMS 1/2 (1-cyc)	3.57A	11.89A	133.73A
N Current RMS 1/2 (1-cyc)	1.88A	7.22A	57.55A
L6 Current RMS 1/2 (1-cyc)	0.000A	15.030A	186.657A
L7 Current RMS 1/2 (1-cyc)	0.000A	14.892A	174.777A
L8 Current RMS 1/2 (1-cyc)	1.054A	5.075A	110.787A
Frequency (1-cyc)	59.904Hz	59.999Hz	60.059Hz
V Unbal Neg Seq	0.00%	0.32%	2.58%
V Unbal Zero Seq	0.00%	0.51%	4.79%
I Unbal Neg Seq	0.15%	49.83%	90.10%
I Unbal Zero Seq	0.00%	10.62%	71.67%
THD-V	1.05%	1.87%	4.66%
THD-V L1-N	1.14%	1.84%	3.35%
THD-V L2-N	1.05%	1.80%	4.66%
THD-V L3-N	1.23%	1.99%	3.77%
TDD-A	0.17%	1.01%	4.78%
TDD-A L1	0.41%	1.21%	4.78%
TDD-A L2	0.31%	0.90%	4.78%
TDD-A L3	0.17%	0.94%	4.03%
Flicker Pinst	0.00	0.04	357.61
Flicker Pst	0.04	0.21	1.39
Flicker Plt	0.15	0.27	0.70
Apparent Power	3.003kVA	7.112kVA	54.164kVA
Apparent Power L1	1.186kVA	2.981kVA	24.369kVA
Apparent Power L2	0.537kVA	2.695kVA	23.340kVA
Apparent Power L3	0.429kVA	1.436kVA	15.303kVA
Reactive Power	-0.671kVAR	1.470kVAR	22.490kVAR
Reactive Power L1	-2.740kVAR	-0.159kVAR	7.162kVAR
Reactive Power L2	-0.596kVAR	1.634kVAR	16.289kVAR
Reactive Power L3	-1.345kVAR	-0.005kVAR	7.259kVAR
Real Power	2.583kW	6.370kW	48.313kW
Real Power L1	1.167kW	2.888kW	24.255kW
Real Power L2	-0.458kW	2.091kW	17.232kW
Real Power L3	0.403kW	1.391kW	14.921kW
PF	0.651	0.893	0.999
PF L1	0.726	0.981	1.000
PF L2	0.046	0.738	0.999
PF L3	0.549	0.980	1.000

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.