Operating costs
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| (€ million) | 2011 | 2012 | 2013 | Change | % Change | ||
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| Business segments | 
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| Transportation | 387 | 478 | 375 | (103) | (21.5) | ||
| Regasification | 23 | 25 | 21 | (4) | (16.0) | ||
| Storage (*) | 64 | 69 | 110 | 41 | 59.4 | ||
| Distribution | 633 | 698 | 638 | (60) | (8.6) | ||
| - of which effects of IFRIC 12 | 360 | 325 | 319 | (6) | (1.8) | ||
| Corporate | 
 | 176 | 188 | 12 | 6.8 | ||
| Consolidation eliminations | (114) | (246) | (287) | (41) | 16.7 | ||
| Consolidation adjustments | 
 | (71) | 
 | 71 | (100.0) | ||
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 | 993 | 1,129 | 1,045 | (84) | (7.4) | ||
Operating costs (€1,045 million) decreased by €84 million, or 7.4%, compared with 2012. Excluding the effects of applying IFRIC 12, operating costs decreased by €78 million compared with 2012, or 9.7%.
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| Operating costs – Regulated and non-regulated activities | |||||
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| (€ million) | 2011 | 2012 | 2013 | Change | % Change | 
| Costs of regulated activities | 967 | 1,011 | 1,001 | (10) | (1.0) | 
| 456 | 453 | 460 | 7 | 1.5 | |
| Variable costs | 18 | 48 | 100 | 52 | 
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| Other costs | 493 | 510 | 441 | (69) | (13.5) | 
| - of which effects of IFRIC 12 | 360 | 325 | 319 | (6) | (1.8) | 
| - of which special items | 
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 | 26 | 26 | 
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| Costs of non-regulated activities | 26 | 118 | 44 | (74) | (62.7) | 
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 | 993 | 1,129 | 1,045 | (84) | (7.4) | 
Costs of regulated activities
Controllable fixed costs (€460 million), comprising the sum of personnel expenses and recurring external costs, were largely unchanged compared with 2012 (€453 million).
Variable costs (€100 million) mainly reflect withdrawals from storage for gas sales carried out for balancing purposes. The €52 million increase was mainly due to more disposals carried out in 2013.
Other costs (€441 million) relate essentially to: (i) the costs of construction and upgrading of distribution infrastructure (€319 million), recorded pursuant to IFRIC 12; (ii) expenses offset in revenue primarily relating to connection costs (€53 million); (iii) concession charges relating to natural gas distribution concessions (€49 million); and (iv) charges for redundancy incentives pursuant to Law 223/91 (€26 million).
Costs of non-regulated activities
Non-regulated operating costs (€44 million) decreased by €74 million, mainly reflecting reduced withdrawals from storage, due to disposals of assets no longer used for transportation activities (-€89 million).
Regulated and non-regulated costs for 2013, excluding special items and components offset in revenue, came to €561 million, down €70 million, or 11.1%, on 2012. The decrease mainly reflects a reduced allocation to provisions for risks and charges (-€50 million).
The following tables shows the workforce in service at 31 December 2013 (6,045 people) by business segment and professional status.
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| (number) | 2011 | 2012 | 2013 | Change | % Change | 
| Business segments | 
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| Transportation | 2,755 | 1,978 | 1,952 | (26) | (1.3) | 
| Regasification | 74 | 78 | 79 | 1 | 1.3 | 
| Storage | 278 | 307 | 303 | (4) | (1.3) | 
| Distribution | 3,005 | 3,016 | 3,008 | (8) | (0.3) | 
| Corporate | 
 | 672 | 703 | 31 | 4.6 | 
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 | 6,112 | 6,051 | 6,045 | (6) | (0.1) | 
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| (€ million) | 2011 | 2012 | 2013 | Change | % Change | 
| Professional status | 
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| Executives | 118 | 115 | 116 | 1 | 0.9 | 
| Managers | 544 | 560 | 579 | 19 | 3.4 | 
| Office workers | 3,277 | 3,257 | 3,271 | 14 | 0.4 | 
| Manual workers | 2,173 | 2,119 | 2,079 | (40) | (1.9) | 
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 | 6,112 | 6,051 | 6,045 | (6) | (0.1) |