I belong to a Group that purchases Oil for Central Heating, it makes a considerable saving, Prices are less than I was paying myself over two years ago.
The same group got a "Council grant"in April this Year to organise Energy and Gas supplies to customers they hired an advisory firm to help customers, it turned out it was a bit of a "con" this firm was the organisation that posted Information on the Web about differences in energy suppliers and how to change, this firm did the paperwork which did help a lot of people that did not understand the procedure,
the problem is that there are so many different Tariffs and people get "bogged down"with the paperwork which benefits the Energy Suppliers.
most people were disappointed it was not on the same principle as the oil supply but joined anyway, so there is a possible saving there, we will have to see over this winter if we were told the right supplier.
But my opinion is that the smaller energy companies will be wiped out over the next couple of years leaving the main six Companies, similar to the Telephone Companies that started up ten years or so ago with cheap telephone accounts (What happened to Mercury Telephone Service ?)