The emergency call asked power companies to bring on extra capacity as the margin of available supply over potential peak demand was becoming worryingly thin.

The amount of topquality industrial space on the market represented only 9 per cent of the available supply, down from a peak of 29 per cent in 2008.

State transportation departments further refine aggregate material specifications in order to tailor aggregate use to the needs and available supply in their particular locations.

A key component in building the tunnel was the readily available supply of precast deck segments nearby.

It relates to a long-term decline in the available supply of petroleum.