I think highest/easiest ROI would be devices that alert or avoid bad events.

• freezer/fridge temp monitors to avoid food going bad (circuit failure, door cracked open, part failure)
• water leak detectors (water heater, bathroom, sink)
• open door alarms ( garage door left open overnight, fence door left open that lets dog out)
• doorbell camera/microphone (unwanted visitors)

This inspired me to go into science.

A lot of smart outlets develop problems over time from the inductive surge current on electric motor startup (air conditioner, fridge, dehumidifier). The current ratings in ads are generally for resistive loads. Inductive load limits can be 30% less.

https://bigthink.com/starts-with-a-bang/universe-13-8-or-26-7-billion-years/

Tired light theory requires:

1. Distant galaxies to be blurry (they aren’t)
2. Events in faraway galaxies to happen at the same pace as nearby events (they don’t. Time is dialated just like frequency is redshifted)
3. Cosmic background radiation would not be a black body
4. Constants c, G, and hbar would change through the history of the universe.

https://archive.ph/4rhP4

https://cloudfree.shop/?s=Switch

They do discuss several commonalities in the paper.

https://www.sciencedirect.com/science/article/pii/S0301421523002276?via%3Dihub

If it is to meet the Paris Agreement target, the worldwide average carbon price in 2030 needs to be equal to today's (2022) highest carbon taxes ($ 130–137 tCO2-1) that are observed in very few countries

Electricity cannot decarbonise the entire system alone, and hydrogen extends electricity's reach to hard-to-electrify sectors

The contribution of nuclear power in electricity production increases in the long-term in the decarbonisation scenarios. This is especially pronounced after 2050/60, when the wind and other renewable potentials are fully exploited and the additional electricity supply to meet the increasing demand needs to remain carbon-free.

https://bigthink.com/starts-with-a-bang/universe-13-8-or-26-7-billion-years/

Tired light theory requires:

Distant galaxies to be blurry (they aren’t)
Events in faraway galaxies to happen at the same pace as nearby events (they don’t. Time is dialated just like frequency is redshifted)
Cosmic background radiation would not be a black body
Constants c, G, and hbar would change through the history of the universe.

Probably trying to avoid SpaceX’s launchpad environmental issues.