[holding answer 27 October 2008]: Currently there are around 50GW in total of generation with offers of connection to the grid.
National Grid publish a list of all offers of connections to the grid on their Transmission Entry Capacity (TEC) Register. This is available on their website
The TEC register includes specific projects, grid capacity and dates for completion but is not broken down by generation type. National Grid do not currently publish a breakdown of the projects by generation type.
We do not hold information on each generation type of the projects with offers of grid connection, although the DECC Re Stats planning database
lists renewable generation projects by type of renewable energy.