## [Sustainable Energy – without the hot air - 10 pages - David J.C. MacKay](https://knowen-production.s3.amazonaws.com/uploads/attachment/file/3025/synopsis10%2BMackay.pdf)

PC/laptop consumes about 0.2 kWh/day, which is 200W during 1 hour (or 2 lightbulbs for an hour, or roughly 20W during 24 hours).
iPhone consumes about 0.005 kWh/day (2 kW/year which is to power ten 100-watt incandescent lightbulbs for an hour)
A human consumes about 125 kWh/day

*average energy measured in kWh, meaning averaged use during a day*
[How Much Electricity Do Your Gadgets Really Use?](https://www.forbes.com/sites/christopherhelman/2013/09/07/how-much-energy-does-your-iphone-and-other-devices-use-and-what-to-do-about-it/#5bbfcd932f70)

## [Harvesting the Earth’s infrared energy](https://physicsworld.com/a/harvesting-the-earths-infrared-energy/)

> Year-round, the devices would produce an average of 2.7 W/m2, or 0.06 kWh/m2 per day, the researchers calculated.

[Harvesting renewable energy from Earth’s mid-infrared emissions-  Steven J. Byrnes, Romain Blanchard, and Federico Capasso](https://www.pnas.org/content/111/11/3927)

## https://en.m.wikipedia.org/wiki/Electromagnetic_spectrum

## technical papers

- [Harvesting renewable energy from Earth’s mid-infrared emissions](https://knowen-production.s3.amazonaws.com/uploads/attachment/file/3746/midinfra%2Bemmissions.pdf)

[A Shockley-Queisser analysis of an ideal optimized diode, taking into consideration the realistic transmissivity spectrum of the atmosphere, indicates the theoretical maximum power density of 3.99 W/m2 with the diode temperature at 293 K. The results here point to a pathway towards night-time power generation.](https://knowen-production.s3.amazonaws.com/uploads/attachment/file/3748/Midinfrared%2Benergy%2Bharvesting.pdf)

- [Radio-Frequency Rectifier for Electromagnetic Energy Harvesting: Development Path and Future Outlook](https://knowen-production.s3.amazonaws.com/uploads/attachment/file/3747/RF%2Benergy%2Bharvesting.pdf) By Simon Hemour, Member IEEE, and Ke Wu, Fellow IEEE

> This paper reviews the evolution and the historical milestones/breakthroughs of
> electromagnetic energy conversion techniques over the years with an emphasis on
> low-density energy-harvesting technologies.