This is a request for change.org signatures, since I don't know how else to make progress on this. Here's the text of the petition so you can stop here if you're not interested.
Almost every home built since 1989 has multiple line-powered smoke detectors. They use a cheap inefficient AC to DC power supply that uses about $90 worth of electricity to run for the typical 10 year life of each detector.
This is a waste of money and electricity for anyone who has these life-saving devices. The amount of electricity actually used by the smoke detector function itself is almost too small to be measured, given that detectors powered by battery only can last 10 years on a single battery.
The solution is exceptionally simple. Require that all line-powered smoke detectors meet the same regulations that already exist for phone chargers.
Phone chargers were required to meet efficiency specifications starting in 2016 and are still very inexpensive. Requiring smoke detectors to use the same type of AC to DC power supply currently used in phone chargers might raise the cost of a smoke detector by at most a couple dollars but would save users around $90 worth of electricity over the life of a smoke detector.
Here's how I calculated the $90 number. I found smoke detectors specifications for the current they use range from 0.04 to 0.08 amps which is 4.8 to 9.6 Watts. So I picked 8 Watts, and my local electricity rate of 13 cents per kilowatt hour. 0.13 $/kwh * 0.008 kw * 24 hrs * 365 days * 10 years = $91. I also measured the current use of a line-powered smoke detector and it was pretty close to the specified value. The power used by a smoke detector would fall into the standby power range definition used for phone chargers which has a limit of 0.1 W. That would use $1 worth of electricity over 10 years.
Source: Fantastic-Hat-7415