There was an IET event I attended in 2011 called
"Energy Storage: A pragmatic Approach"
The talks are on IET TV, some are very good.
The one most relevant to the efficient siting of storage is
"Developing operation strategies for electrical energy storage systems in future distribution networks"
Prof Philip Taylor, DONG Energy Professor of Renewable Energy, Deputy Director Durham Energy Institute
A viable economic model for energy storage on the various timescales needed has yet to be established as was pointed out in another talk. So the problem is still an open one.
The grid operator will want to keep all energy supply on grid. However if we end up paying wind farm generators not to supply wind energy to the grid on a regular basis, then this is a waste of consumers money and a waste of energy. This energy could otherwise be put to some productive use off grid.
National Grid says that the curtailment of wind energy is unlikely to happen on a regular basis. However the only way of giving them a strong incentive to stop this from happening, is to force National Grid shareholders to pay the costs of grid curtailed electricity, not consumers. Without safe guards such as this, allowing some off grid electicity supply networks to benefit from the wind electricity National Grid rejects seems a sensible suggestion to me.