Yes it's Steem Power. It has been an experience using it for the past 2 years!
I just completed a piece on scaling summaries (for technical solutions) for Ethereum. It is an official employer piece and there was a lot of help from the W3F and Giveth teams behind the scenes: ScalingNOW! — Scaling Solution Summary
Nice! I've been out of the know on eth architecture scaling for sometime now and it's really quite coincidental that I came across your account then. Gonna have a read and update myself, thanks!
Just double checking SP was steem power and not some theory from DK or NNT that I couldn't remember. :-)
Sometime in the near future I'm going to work on creating a spreadsheet containing as many scaling solutions as I can ( / as reasonably possibly) and include those which might be a couple years away.