>What's the word for this type of propaganda, where they add in some sort of adjective that wasn't needed, in order to prime the reader on how to think/feel, rather than just objectively reporting the facts?
It's called an editorial.
It's not supposed to be a mere report, concerned with respecting any random person's feeling about how all electricity consumption is equally valid and should be equally respected.
It's called a value judgment and an emotionally charged tone. That's certainly a form of editorial but IMO not the good kind. If an outlet seeks to advocate for a cause it ought to do so in a well reasoned manner and with a professional tone.
Editorials are a thing. This is not an editorial. It's structured as a news report.