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84 votes
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Can the US be powered by a 100 miles x 100 miles solar grid?

Can the US be powered by a 100 x 100 miles solar grid? Desertec is basically the same idea, solar plants located in North Africa supplying power to Europe. The article includes a map showing the area ...
DevSolar's user avatar
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52 votes
Accepted

Do Starship's grocery delivering robots consume only as much energy as boiling water for a cup of tea per trip?

tl;dr: The claim is nearly true. Based on publicly available data, the robot uses the energy required to heat water for one cup of tea every 27 minutes. This is probably a bit less than the time ...
LShaver's user avatar
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50 votes

Do Starship's grocery delivering robots consume only as much energy as boiling water for a cup of tea per trip?

tl;dr Plausible. Let's compare their robot with a roughly equivalent electric vehicle, a hoverboard. First, let's turn the marketing claims into numbers. How much energy to boil a cup of tea? It takes ...
Schwern's user avatar
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22 votes

Can the US be powered by a 100 miles x 100 miles solar grid?

It seems possible, at least in theory. Of course, whether it possible and whether it's remotely economically feasible are completely different questions. A decent back-of-the-envelope series of ...
HopelessN00b's user avatar
  • 1,395
20 votes

Do "smart meters" bring about any significant savings?

There have been a number of studies that investigate how consumer behaviour changes when feedback from a smart meter allows them to understand their usage habits. 2010, The impact of informational ...
Oddthinking's user avatar
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12 votes
Accepted

Does Leonardo DiCaprio fly on private jets?

Yes, he has flown on a private jet on at least a few occasions. From the WikiPedia on Leonardo DiCaprio: ... his use of private jets and superyachts has attracted criticism by some sections of the ...
Batman's user avatar
  • 1,074
11 votes

Are electric stoves less energy-efficient than gas stoves?

Depends on how you make and distribute your electricity This paper states that induction, conventional electric, and gas are 90%, 72%, and 40% efficient respectively at point of use. The efficiency of ...
Dale M's user avatar
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9 votes
Accepted

Does streaming a video to smartphone consume 1000W of electricity?

Summary: The data (model + coefficients together with source citations) of the Lean ICT study are available (see below). HD Video streaming consuming between 250 W and 1 kW power equivalent is ...
cbeleites unhappy with SX's user avatar
8 votes

Do Starship's grocery delivering robots consume only as much energy as boiling water for a cup of tea per trip?

@LShaver’s excellent answer crunches the numbers and concludes the claim is almost correct. I want to point out several additional factors that actually tilt the numbers further in favor of the ...
Dan Romik's user avatar
  • 5,354
5 votes

Is DAB+ digital radio more energy efficient than FM radio?

[Edited to add reference to European Broadcasting Union Cost-Benefit analysis] A cost-benefit analysis of FM vs DAB undertaken for the European Broadcasting Union based on a detailed analysis of Big-...
Duke Bouvier's user avatar
4 votes

Are electric stoves less energy-efficient than gas stoves?

Dale M wrote the answer I would've. But why are we talking about energy efficiency? Typically it's in the context of reducing carbon emissions, which actually is a topic of climate change. (Let's set ...
Harper - Reinstate Monica's user avatar
4 votes
Accepted

Do "smart meters" bring about any significant savings?

Oddthinkings answer is excellent though I'd like to take a slightly different tack to the question. With some smart meters your bill can change quite dramatically depending on the design of the smart ...
Murphy's user avatar
  • 9,492
2 votes

Do setback thermostats cause more energy to be used, and does the heating type matter?

According to The Effects of Thermostat Setting on Seasonal Energy Consumption at the CCHT Research Facility (2005): An 18°C night and daytime setback reduced the length of time the furnace ran, ...
DavePhD's user avatar
  • 107k
1 vote

Can the US be powered by a 100 miles x 100 miles solar grid?

I'm skeptical, since if it true, then why didn't anyone build this square already? Just focusing on this part. The other answers already seem to indicate that such an area might be large enough to ...
NoDataDumpNoContribution's user avatar

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