(Photo by Alexey Topolyanskiy.)

Studying sustainable energy means learning several new "colors" of hydrogen - grey, green, blue, turquoise, and pink. These are not real colors, but labels on the relative GHG associated with producing and using hydrogen as a fuel.

Green hydrogen tops the list, as producing it through electrolysis releases no GHG. Burning any type of hydrogen, of course, creates water as the byproduct.

A couple of recent articles help move this story forward. One is a press release from Norway that outlines a new agreement to deliver electrolyzers to make 40MW of electricity from solar-power plants. Of particular interest is the concept mentioned here of a "green hydrogen value chain."

https://www.esgimpactzone.com/edition/daily-carbon-offsets-climate-change-2023-01-08/?open-article-id=22883724&article-title=statkraft---nel-and-statkraft-pave-the-way-for-a-green-hydrogen-value-chain-in-norway&blog-domain=globalrenewablenews.com&blog-title=global-renewable-news

A second article, from Bloomberg, outlines Western concerns over China soon monopolizing the emerging market or electrolyzers:

https://www.bloomberg.com/news/articles/2023-01-10/is-green-hydrogen-the-fuel-of-the-future-china-us-europe-are-betting-on-it

The amount of hydrogen electrolyzed for use as a fuel is expected to grow almost 100 times by 2030, according to the Bloomberg article.