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Energy production

NET ELECTRICITY PRODUCED BY TYPE OF PLANT AND SOURCES (GWh)
    2009 2010 2011
Thermoelectric plants High yield natural gas combined cycle 5,778 4,280 4,015
Multi-fuel plants - 1,927 1,614
Waste to energy (including biogas) 569 568 572
Cogeneration plants Multi-fuel plants 291 272 286
Waste to energy (including biogas) 430 575 602
Hydroelectric plants   2,240 3,291 3,048
Photovoltaic plants   <1 <1 <1
Total 9,308 10,913 10,137
NET THERMAL ENERGY PRODUCED BY TYPE OF PLANT AND SOURCE (GWh)
  200920102011
Cogeneration and heat recovery plants Fossil fuels 788 733 717
Waste to energy 717 916 906
Thermal plants Boilers
389 481 395
Pompe di calore 5 4 48
Waste to energy (biogas) 2 1 1
Total 1,901 2,135 2,067
PERCENTAGE OF NET ELECTRICITY PRODUCED BY SOURCE
  2009 2010 2011
Renewable sources (hydraulic. renewable fraction of waste. biogas. solar) 29.5% 36.5% 36.7%
Coal
1.3% 16.0% 15.5%
Natural gas 63.1% 40.8% 41.2%
Oil products 0.8% 1.5% 0.9%
Nucleare 0% 0% 0%
Waste: non-renewable fraction*  5.3% 5.2% 5.7%
* It is assumed that there is a renewable fraction of 51 % for non-hazardous waste (ref. Decree of the Ministry for Economic Development of December 18, 2008). As a consequence it is assumed that the non-renewable fraction is 49 %.
THERMAL ENERGY FROM WASTE TO ENERGY**
  2009 2010 2011
              
37.8% 42.9% 43.9%
ELECTRICITY FROM WASTE TO ENERGY
  2009 2010 2011
              
10.7% 11.4% 12.4%
** Energy produced by waste to energy plants and biogas plants as a percentage of the total energy produced by the Group.
ENERGY PERFORMANCE
  2009 2010 2011
Average thermoelectric power station yield 51.50% 45.40% 45.70%
yield from high natural gas combined cycle 51.50% 51.50% 51.40%
yield from multi-fuel plants n/av 35.00% 34.90%
Average cogeneration yield from fossil fuel plants 79.90% 79.70% 79.20%
Average energy saving from fossil fuel cogeneration plants* 22.50% 18.10% 13.90%
Average electricity produced by 1 tonne of waste (kWh/t) 772 785 813
Average thermal energy produced by 1 tonne of waste (kWh/t) 541 580 606
* For 2009 and 2010 this indicator has been calculated by referring to the method described in resolution no. 42/02 of the Electricity and Gas Authority, and in accordance with the Ministerial Decree of August 4, 2011 for 2011. The figure is an average and is indicative.

Energy distribution

ELECTRICITY, THERMAL AND GAS ENERGY PUT INTO THE NETWORK
  2009 20102011
Electricity distributed (GWh) 11,321 11,37511,489
Thermal and cooling energy (GWh) 1,939 2,1672,104
Natural gas (Mm3) 2,049 2,2552,011

Integrated waste cycle

QUANTITY OF WASTE COLLECTED (t)
  2009 2010 2011
Urban waste collected 1,247,076 1,252,769 1,205,730
Special waste collected and transported 610,380 689,087 760,887
Intermediate special waste 22,190 28,220 27,903
DIFFERENTIATED COLLECTION*
  2009  2010  2011 
  Quantity collected (t) Index
%
Quantity collected (t) Index % Quantity collected (t) Index %
Bergamo 32,301 50.4 32,581 51.00% 32,938 52.40%
Brescia 55,131 40.2 57,180 40.70% 56,935 41.40%
Milano 254,036 35.7 240,413 33.80% 238,662 34.50%
Varese 20,430 47.4 21,203 48.60% 20,354 49.70%
Total/average 361,898 37.80% 351,377 36.60% 348,889 37.40%
* These figures refer only to municipalities that are also provincial or regional capitals; the quantity collected and the differentiated collection index have been calculated on the basis of the recommendations of the Region of Lombardy.
WASTE TREATED BY GROUP PLANTS BY TYPE OF PLANT* (t)

2009 2010 2011
Waste to energy plants 1,387,771 1,563,583 1,541,443
Landfills 585,659 539,295 378,657
Biodessication plants and RDF production 390,474 409,966 408,070
Other material recovery plants 397,805 454,296 461,587
Dust inertisation plants 13,747 21,287 4,537
Total 2,777,465 2,988,427 2,794,295
* All waste entering the Group’s plants is considered.

Integrated water service

PROCUREMENT AND DISTRIBUTION SERVICE
Technical data 2009 2010 2011
Wells (n°) 273 274 255
Springs  (n°) 298 298 188
Drinking water plants (n°) 64 58 55
Total network length  (km) 6,086 6,061 4,670
Water supplied  (Mm3) 110 109 76
Water withdrawn  (Mm3) 164 159 118
Network losses (Mm3) 44 40 32
Drinkability analysis – samples  (n°) 17,616 16,760 14,047
Drinkability analysis – total parameters  (n°) 212,597 220,829 169,576
ENVIRONMENTAL INDICATORS
  2009 2010 2011
Analysis per m3 of water supplied (n°/Mm3) 1,934 2,026 2,219
Network losses 26.40% 24.90% 27.20%
Litres/resident/day 278 275 257
CATCHMENT AND PURIFICATION SERVICE
Technical data 2009 2010 2011
Sewerage - Network length (km) 2,329 2,350 2,080
Waste water treated (Mm3) 75 79 55
Purifiers (number) 62 62 61
Loads treated – COD (t) 21,025 18,724 14,293
Loads treated – BOD (t) 9,562 8,811 6,744
Loads treated – Total nitrogen (t) 2,236 2,041 1,726
Loads treated – Total phosphorous (t) 335 275 216
ENVIRONMENTAL INDICATORS*
  2009 2010 2011
Removal yield  - COD 90% 87% 92%
Removal yield  - BOD 93% 92% 95%
Removal yield  - Nitrogen 63% 62% 69%
Removal yield  - Phosphorous 74% 75% 75%
* The change is due to external factors such as the concentration of pollutants on entry, rainfall and air temperature which affect the biological purifying activity carried out by the bacterial biomass. As regard nitrogen and phosphorous, new sections were started up in certain purifiers in 2009 to remove these pollutants.