European System-operators gearing up for Demand Response?

ETSO, which is the co-operation of European Transmission System Operators, has published an explanatory note on Demand Response (DR) that contains a survey of the options and some experiences form selected countries. US DOE published a report on the benefits of DR about a year ago and that contains very good graphic overviews Taken together the reader gets the impression that the electricity market still is immature and can be much more developed when (if) customers will be able to exercise choices not only on the supplier but on the amount to be delivered in relation to price (or urgency).

But still the issue remains - who will act to make it happen? The Transmission System Operators obviously have an incentive when congestions shows that the system could break down, but there seems to be a role also for "aggregators" to step in as intermediates. Clever statisticians with a business-mind?