I went paperless this year as an engi student with dendron, xournal++, a (used) wacom tablet, and some pdf editors. The main benefits were avoiding scanning, instantly being able to reorganize or copy/paste diagrams, and not having to carry notebooks. Pencil or pen and paper still feels the best but in order to keep everything digital, this was reliable and cheaper than an ipad or tablet. https://alternativeto.net/list/34598/paperless-student/

I think more power usage = doing more things, and although the power was generated cleanly, it won't necessarily be spent similarly