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OKIsItJustMe

(22,229 posts)
3. Why exajoules? not use watt/hours?
Thu May 28, 2026, 05:43 AM
Thursday

I think it’s part of your snow job. You use unfamiliar units to impress people with your unquestionable wisdom!

🎵And ev'ry one will say,
As you walk your mystic way,
“If this young man expresses himself in terms too deep for me,
Why, what a very singularly deep young man
this deep young man must be.’
🎶


Most people are familiar with watts. A joule is one watt second.

People of a certain age are familiar with a "100 watt lightbulb" for example. Leave it burning for an hour, that’s 100 watt hours or (if you prefer) 360,000 joules.

60 minutes/hour × 60 seconds/minute gives us 3,600 joules per watt hour. Multiply that by 100 (for our 100 watt lightbulb.) If you think in terms of LED’s (good for you!) to keep things simple, divide by 10 (leave it on for an hour, that’s 36,000 joules.)

It’s a reasonably good approximation to say that a “Gen III” reactor produces about a gigawatt of power (think of "Doc Brown" from Back to the Future1.21 Gigawatts⁉️”) The prefix “giga” is now something people are familiar with, although linked with bytes.

(kilo = 1,000) A kilowatt is 10 100 watt lightbulbs
(mega = 1,000,000) A megawatt is 10,000 100 watt lightbulbs
(giga = 1,000,000,000) A gigawatt is 10,000,000 100 watt lightbulbs

A “standard” household solar panel may have a capacity of roughly 20 W/sq ft. That’s capacity, it’s capable of producing up to 20 W/sq ft.. In the dark, it won’t be producing any power at all,


https://www.reuters.com/business/energy/renewables-grew-almost-50-global-electricity-capacity-2025-after-solar-boost-2026-03-31/
Exclusive: Renewables grew to almost 50% of global electricity capacity in 2025 after solar boost
By Susanna Twidale
March 31, 2026 12:02 PM EDT

Summary
  • Global renewable capacity reached 5,149 GW in 2025, up 692 GW from 2024
  • Annual renewable growth rate rose to 15.5% in 2025
  • Middle East crisis underscores fossil fuel energy security risks, says La Camera
LONDON, March 31 (Reuters) - Renewable power made up almost 50% of the world’s electricity capacity last year after a record ‌increase in solar installations, data from the International Renewable Energy Agency shared exclusively with Reuters showed on Tuesday.

As the Middle Eastern conflict has led to record monthly gains on oil markets, some in industry have lobbied for more investment in fossil fuels, but ​countries with higher renewable capacity have been insulated from the market shock, some analysts say.

“The Middle East ​crisis has, in some ways confirmed dramatically energy security is not something we can be ⁠sure of with fossil fuels,” IRENA Director-General Francesco La Camera told Reuters.

Global renewable power capacity reached a record ​5,149 gigawatts at the end of 2025, up 692 GW from 2024, the data showed.




I’d like to see more nuclear reactors in NYS. However, for me, a high priority to replace our current “Gen II” reactors. They’ve served us well, but they are among the oldest in the United States. (Nine Mile Point, Unit 1, began commercial operation in December 1969, it’s currently slated to be shut down in 2029.)

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