Geothermal energy offers many advantages.

On the production side
    + Primary energy, 24h/24 availability, all year
    + Reliable and predictable production, not intermittent (baseload energy)
    + Power plant factor capacity between 75% and 95%, about 6570 to 8322 hours/year
    + Decentralized energy with a neutral impact on existing power grids (not intermittent)
    + Geothermal reservoir has long life (40 to 50 years minimum)

On the environmental side
    + Clean and renewable energy    
    + No greenhouse gas nor air pollution
    + Low land easement
    + Available everywherewith high concentration in some location (volcanoes, magmas)
    + Alternative energy to coal and oil&gas capacities (which have more greenhouse gas emissions)
    + Energy security and independance for territories or countries, no external supplies
Land easement of different energy power systems 
compared to geothermal
source : Islandbanki

Furthermore, geothermal power plant development can have some drawbacks, but they are well controlled.

During the well drilling phase, the rig can cause noise. In the Paris basin where more than 80 geothermal wells were drilled in the last 30 years, developpers has always reduced this temporary nuisance with adequat means.

Very low magnitude induced seismicity (not felt) is possible during operation, depending on the encountered geological setting. Seismic monitoring system can reduce these events by modulating the power plant production. Developpers should therefore inform the public and integrate it into this kind of project.