Me: Isn’t this a scam? Stop Watt https://www.stopwatt-official.com/en/?flux_fts=qcapociooqtzxplqqapetaqzliqqzpqzactcacq6bed9 For the reason that cleaning the power lines of “signal noise” downstream of the meter won’t make the meter itself work any differently?

ChatGPT: David, yes — your reasoning is fundamentally correct. I would classify StopWatt’s advertised electricity-bill savings as **not technically credible**, and the general class of plug-in “power saver” devices has repeatedly been identified as ineffective for reducing normal residential electric bills. The StopWatt site itself claims that plugging the device into an outlet will “optimize” electricity, eliminate “excess,” and reduce monthly expenses. ([StopWatt][1]) Independent verification specifically examining StopWatt/MiracleWatt-type devices concluded that they do **not** reduce household electric bills. ([WTSP][2])

Your meter observation gets right to the key issue. A residential utility meter is essentially interested in **real energy consumed over time — kilowatt-hours (kWh)**. Suppose an appliance actually consumes:

P = 1,000 W

and runs for one hour. You have bought approximately:

Energy = 1,000 W × 1 hour = 1 kWh

Putting a little box in another outlet does not somehow make that appliance perform the same work while causing the meter upstream to record substantially less real energy.

There is one legitimate electrical concept behind some of the marketing: power-factor correction. A capacitor connected across the AC line can partially compensate for inductive reactive current from motors, transformers, etc. That can reduce apparent power/current demand in part of the electrical system.

For example, imagine a motor consuming 1,000 W of real power.

Before power-factor correction, suppose its power factor is 0.70:

Apparent power = 1,000 W ÷ 0.70 = 1,429 VA

After suitable power-factor correction, suppose the power factor improves to 0.95:

Apparent power = 1,000 W ÷ 0.95 = 1,053 VA

Because the apparent power is lower, the RMS current supplied upstream is also reduced.

But notice what did not change:

Real power = 1,000 W

The motor is still using approximately 1,000 watts of real power to do its work. For a typical residential customer, that real energy consumption is what primarily determines the electric bill.

This is why power-factor correction can make economic sense for some industrial customers who are billed for poor power factor or demand, while providing essentially no electricity-bill savings to an ordinary residential customer. ([EEP – Electrical Engineering Portal][3])

The “dirty electricity,” “line noise,” and “stabilizing voltage” claims are even more misleading when they’re presented as the mechanism for large energy savings. Filtering high-frequency noise can be completely legitimate engineering — EMI filters are everywhere — but **removing noise isn’t equivalent to removing substantial real power consumption**.

And your upstream/downstream observation is particularly important:

**Utility → revenue meter → service panel → branch circuit → StopWatt**

Anything the StopWatt does happens **after the meter**. It could conceivably change the electrical characteristics of the load seen by the meter — power factor is one example — but it cannot simply “clean” already-metered electricity and thereby erase real watt-hours.

In fact, there is a wonderfully simple sanity test for claims of huge savings. Imagine that you have:

* a 1,500 W space heater,
* a 1,000 W microwave,
* a 700 W computer,
* a refrigerator,
* lights,
* televisions, etc.

Now plug a tiny StopWatt box into one receptacle.

If it genuinely reduced your bill by, say, **30–50% while all those devices continued producing exactly the same heat, light, computation, and mechanical work**, it would represent an extraordinary advance in electrical engineering. Utilities, factories, data centers, HVAC manufacturers, appliance companies, and electrical engineers worldwide would be using the technology.

Instead, closely related products are available for a few dollars apiece, and teardowns commonly find little more than an LED circuit and sometimes a capacitor. ([YouTube][4])

So I would slightly refine your original statement:

> **Cleaning electrical noise downstream of the meter won’t materially reduce the real kilowatt-hours registered by the meter.**

That’s the core flaw.

There can be tiny secondary effects — reduced wiring losses from corrected current, filtering, transient suppression, etc. — but those are nowhere remotely near the dramatic residential savings advertised for these devices.

**In engineering terms, the advertising is confusing real power, reactive power, apparent power, electrical noise, and energy consumption as though they were interchangeable quantities. They aren’t.**

And that is probably why your electrical intuition immediately told you something was wrong.

[1]: https://www.stopwatt-official.com/?utm_source=chatgpt.com “Slash Your Energy Bills with StopWatt: Learn How!”
[2]: https://www.wtsp.com/article/news/verify/miraclewatt-stopwatt-energy-saving-devices-scam/67-83224a1a-f046-4923-b158-65251d38553d?utm_source=chatgpt.com “No, plug-in devices won’t save money on your electricity bill”
[3]: https://electrical-engineering-portal.com/the-real-truth-behind-household-power-savers?utm_source=chatgpt.com “The real truth behind household power savers”
[4]: https://www.youtube.com/watch?v=sGEZH7i_DSM&utm_source=chatgpt.com “Scam power saver plug – the 2024 edition.”