You could try and contact Marlies Hesselman (University of Groningen), she's into this kind of topic, though not so much within the EU but rather in developing countries.
I found the presentation you attached very interesting. In Polish literature which you surely know I can recommend works of Piotr Kurowski (IPISS PAN). In the context of liberalization directives it would be interesting to investigate the impact of implementation of vulnerable consumers protection instruments on energy poverty. There are such tools enacted also in Polish law, but in my opinion they do not really adress the problem. Our article when we are trying to shed some light on legal issues of energy poverty and protection of vulnerble consumers will be issued in Samorzad Terytorialny this autumn. In Europe the problem is adressed i.e. by The Vulnerable Consumer Working Group (VCWG) which has been established by Commission services (DG Energy (ENER) in close collaboration with DG Health and Consumers (SANCO) to address the problem of vulnerable consumers, feed the discussions in the CEF, and support the implementation of the 3rd Energy Package. You can also check web pages of CEER. As far as I remember CEER investigated the problem some time ago.
This subject also interests me particularly for the elderly and other vulnerable groups. The obsession of the EU with emissions targets has undoubtedly driven energy prices up through increased taxation but at what point do the side effects become to high to be tolerated. Current estimates of the cost of wave energy for example are as high as 20x that of gas generation - would we really want to deploy this on a massive scale because in the end the tax payer and the consumer have to pay for it. There may of course be economies of scale but it is fundamentally an expensive thing to do.
Edward, I share your point view. Let's add to elderly customers industry in the EU which you can also call a vulnerable group. That protection from EU directives I was writing about in fact should assist climate regulations. But it implies of course higher taxation. At the end of the day fishing, hunting and teleworking will create economy of the EU.