[Fordec]

Only works if your bases are at the poles. Which for some missions works, but it's a limitation if your project needs to be anywhere else.

[Nomentatus]

https://futurism.com/the-byte/harvard-super-tall-towers-powe...

There's a famous-in-the-area ex-NASA blogger with good (not perfect) articles on the topic, but I can't Google and find him 'cause authoritative institutions now seems to trump and drown out mere experts on Google.

Others here cite him: https://caseyhandmer.wordpress.com/2019/08/17/blog-series-co...