|Waste-to-energy plants (51% renewable)||62,463||79,783||71,231|
|Combustion of puification plant biogas||4,294||5,985||6,808|
|Total renewable sources||138,490||149,304||153,422|
|Cogeneration operated as a service||153,222||80,873||81,004|
|Thermoelectric power stations||231,607||216,055||280,361|
|Waste-to-energy plants (49% non-renewable)||60,013||76,655||68,438|
|Total traditional sources||291,620||292,710||348,799|
Thermal energy produced from renewable sources increased by 3% in 2018 following an increase in the energy from geothermal sources (over 11,800 MWh compared to 2017, +16%). The share of energy produced has decreased: from cogeneration (-4%) – due to the lower number of hours of operation of the Imola Casalegno plant as mentioned above – and from the waste-to-energy plants (-11%).
Total net thermal energy produced by the Group’s plants increased by 8%, mainly due to the increase in production from thermal power stations (+64 thousand MWh).
Thermal energy produced from renewable sources was 20.3% of the total in 2018, slightly down compared with 2017, due to the lower production of total energy by the waste-to-energy plants, with consequences on the renewable share of this source. This reduction is only partly offset by the already-mentioned increase in the production of geothermal energy. 34% generated using cogeneration, a high energy efficiency system. Together, the two categories account for 54% of the electricity produced. The energy recovered from waste-to-energy transformation for the share exceeding 51% is 9.1%.