Geothermal energy is a renewable source that uses the Earth’s heat to generate electricity. Due to their high temperature, geothermal fluids frequently show slight traces of harmful natural substances. The latter can produce reduced impacts on air quality, after steam generates electricity and its incondensable gases are released to the cooling towers. In order to abate these emission, Enel Green Power uses the AMIS system, developed and patented by Enel Research, which reduces practically to zero the natural gases and metals associated with geothermal steam. AMIS therefore removes the discomfort caused by the characteristic smell of hydrogen sulphide emissions, facilitating the integration of these plants into the surrounding area.
Air quality is constantly monitored and the monitoring data are publicly available, also on this website.
This section shows the values of concentrations measured by the Enel Green Power’s Air Quality monitoring system. It reports the values of hourly average concentrations of H2S (hydrogen sulphide) for the previous 24 hours, the last 14 days and 90 days. The values are compared with the corresponding reference values of the "Guideline criteria for the limitation of atmospheric emissions of geothermal plants", Resolution dated March 22 2010, n.344, issued by the Regional Council of Tuscany. The reference value marking the threshold of human perception of the smell of hydrogen sulphide is 7 mg / m, as indicated by the World Health Organization.
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Average 24 hours
Average 48-24 hours
Average 72-48 hours
Average 96-72 hours
Data from 29-03-2015 07:00:00 to 30-03-2015 06:00:00
Number of values with concentration > 7 µg/mc = 0 to 24
Number of values with concentration > 7 µg/mc = 6 to 333
Number of values with concentration > 7 µg/mc = 24 to 2142
Last Update: 30-03-2015 06:00:00
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