I'm also curious about why a web GUI is being used here? Power Systems information varies by country, but is generally not something that will ever be publically available, so desktop applications have done well here.
After more thinking, I guess it's a free way for researchers to upload and run public models using free software?
I imagine this app being quite useful to lecturers teaching Power Engineering at Universities. Being able to just send students a link and not requiring them to install complex libraries, deal with licenses or restricted trial versions and them not having to use a particular OS or CPU architecture should help get them started quickly.
Agree that it could be of use for lecturers as most students don't need the full power of PSSE or PowerWorld for the stuff you do in introductory textbooks.
Best of luck in this. I recall during the last FERC Conference on Software that there was at least one academic presentation where they talked about trying to find a good way to visualize these things with a web browser. I can't remember what the specific challenges were though.