National Grid Summer Outlook - The Need For Storage

National Grid's Summer Outlook Report hit the mainstream news with plenty of commentators failing to understand how the system can be both under- and over-supplied. Of course the summer over-supply issue is all about flexibility and predictability. As Edie notes, there may be a need for some wind generation to be "curtailed" at certain times in the summer. This all points up the need for more storage - but where is that going to come from with affordable economics?