I'm afraid the short answer is that there isn't. In fact it was agreed with FLYGVA a little while back that we would create a thread at some point to detail precisely that. There wasn't a huge swath of interest at the time so I've not done it yet.

It is quite a head scratch why this is not done on the IHG web site, especially in the UK were we are not exactly blessed with consistent and plentiful charging. It seems such an easy thing to add and a potential differentiator when making a booking.

For me, I've adopted a policy of, 'if you ain't got a charger and an on-site parking space, I won't be booking' ..... is the only way to express the need and create the demand.... by consumer choice. And I would add that one IC (who will remain nameless) did indeed add extra and different charger points when mentioned to them that we could no longer spend any money with them until they did something. I suspect it may well of been on the radar screen anyway but it was, very visibly bought significantly forward. We still spend money with them

What I have done and do have, is full details of all the InterContinental's across Europe from here to Istanbul with on site parking / near 3rd party parking / whether they do valet park or not / whether they will do a valet clean and details of their respective chargers ... speed / type etc. For some that includes photos. Also have a few Kimptons and a couple of Six Senses. Edit: I'm missing IC Dublin but will contact them tomorrow as they are the only ones I'm missing ... oh and the yet to open Crete location. That did involve (as you mention) emails to FOM's GM's and concierge folks ... who in the main were very accommodating. But it took a good deal of time.

So I can help you with those if it's useful and will when time allows document them all into one paper so that said thread can be created. But is all honestly it seems be only you and me that have interest

What I can say is that to date, I have not been to an IC that has charged me and indeed in some countries (e.g. Switzerland) it's not legal to do so for some odd reason