Problems can also occur when trying to compare the cost of geothermal energy to other resources.
A good example of this would be comparing it to the cost of natural gas, where the cost is lower than geothermal on a cost-only basis. A high economic risk may also be encountered when drilling in frontier areas and limits are placed on exploration. The plants where geothermal energy is processed do not operate in a silent manner. It can potentially be a problem, especially during drilling. Wells are often vented for a matter of hours to clean out the system.