‘09 ‘10 ‘11 ‘12 ‘13
Annual variation in natural gas consumption , % -1,0% 9,1% 0,5% -13,0% -5,0%
Inputs to RNTGN, TWh 54,3 58,3 58,1 50,3 48,8
Outputs to RNTGN, TWh 54,4 58,3 58,2 50,3 48,9
Expansion of RNTGN, km 1.267 1.296 1.298 1.298 1.375
Underground Gas Storage Capacity, Mm3 (*) 138,2 138,2 132,7 132,7 132,7

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(*) The volume indicated expresses the maximum capacity available for commercial purposes, which is conditioned by the specific thermodynamics of highpressure, natural gas storage in salt caverns.