Gas volumes are expressed in standard cubic metres (SCM) with a traditional higher heating value (HHV) of 38.1 MJ/SCM. The basic figure is measured in energy (MJ) and obtained by multiplying the physical cubic metres actually measured by the relative heating value.
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| Availability of natural gas | |||||||
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| (billion m3) | 2011 | 2012 | 2013 | Change | % Change | ||
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| From imports | 70.27 | 67.61 | 61.53 | (6.08) | (9.0) | ||
| Domestic output | 8.03 | 8.17 | 7.48 | (0.69) | (8.4) | ||
| Total gas injected into the network | 78.30 | 75.78 | 69.01 | (6.77) | (8.9) | ||
| Net balance of withdrawals from/injections into storage (*) | (0.89) | (1.51) | 0.49 | 2.00 | 
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| Total availability of natural gas | 77.41 | 74.27 | 69.50 | (4.77) | (6.4) | ||
The availability of natural gas in Italy in 2013 was 69.50 billion cubic metres, down 4.77 billion cubic metres (-6.4%) compared with 2012.
The quantities of gas issued by the national transportation network decreased by 8.9%, to 69.01 billion cubic metres (75.78 billion cubic metres in 2012), due to reduced imports (-6.08 billion cubic metres; -9.0%) and national production (-0.69 billion cubic metres; -8.4%), partly offset by greater net withdrawals from storage (+2.00 billion cubic metres).
The analysis of imports by entry point is as follows:
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| Imports by entry point | |||||
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| (billion m3) | 2011 | 2012 | 2013 | Change | % Change | 
| Entry points | 
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| Tarvisio | 26.45 | 23.85 | 30.26 | 6.41 | 26.9 | 
| Mazara del Vallo | 21.55 | 20.82 | 12.46 | (8.36) | (40.2) | 
| Gries Pass | 10.86 | 9.03 | 7.49 | (1.54) | (17.1) | 
| Gela | 2.34 | 6.47 | 5.70 | (0.77) | (11.9) | 
| Cavarzere (LNG) | 7.02 | 6.17 | 5.35 | (0.82) | (13.3) | 
| Livorno (LNG) | 
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 | 0.21 | 0.21 | 
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| Panigaglia (LNG) | 1.89 | 1.12 | 0.05 | (1.07) | (95.5) | 
| Gorizia | 0.16 | 0.15 | 0.01 | (0.14) | (93.3) | 
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 | 70.27 | 67.61 | 61.53 | (6.08) | (9.0) | 
Imports were down by -6.08 billion cubic metres, due mainly to lower volumes injected at the Mazara del Vallo (-8.36 billion cubic metres; -40.2%), Gries Pass (-1.54 billion cubic metres; -17.1%) and Gela (-0.77 billion cubic metres; -11.9%) entry points and to lower volumes injected by the Panigaglia and Cavarzere regasification terminals (-1.07 billion cubic metres and -0.82 billion cubic metres respectively). These factors were partly offset by higher imports from Russia at the Tarvisio entry point (+6.41 billion cubic metres; +26.9%) and by the opening in October of the new Livorno regasification terminal, which injected 0.21 billion cubic metres into the network.
NATURAL GAS INJECTED INTO THE NETWORK BY ENTRY POINT (% OF TOTAL GAS INJECTED)

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| Volumes of natural gas injected into the network by user | |||||
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| (billion m3) | 2011 | 2012 | 2013 | Change | % Change | 
| Eni | 35.12 | 36.29 | 37.56 | 1.27 | 3.5 | 
| Enel Trade | 9.34 | 8.43 | 6.99 | (1.44) | (17.1) | 
| Other | 33.84 | 31.06 | 24.46 | (6.60) | (21.2) | 
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 | 78.30 | 75.78 | 69.01 | (6.77) | (8.9) |