Landfill gas extraction systems and methods

A method for controlling, with a control system comprising at least one controller, extraction of landfill gas from a landfill via a gas extraction system, the gas extraction system comprising well piping for coupling a plurality of wells, including a first well, to an aggregate gas output, the method comprising:

• using the at least one controller to perform:
• determining whether to adjust a flow rate of landfill gas being extracted from the first well at least in part by:
• comparing a measure of a first characteristic of landfill gas extracted from the plurality of wells and collected at the aggregate gas output to a first threshold;
• determining, based on a result of the comparing the measure of the first characteristic to the first threshold, whether to perform a further comparison;
• when it is determined to perform the further comparison, comparing a measure of a second characteristic of landfill gas extracted from the first well to a second threshold, wherein the second characteristic is different than the first characteristic;
• and
• determining, based on a result of the comparing the measure of the second characteristic of the landfill gas extracted from the first well to the second threshold, whether to adjust the flow rate of landfill gas being extracted from the first well;
• and
• when it is determined to adjust the flow rate of landfill gas being extracted from the first well, adjusting the flow rate of landfill gas being extracted from the first well.