A low NOX burner in which the amount of air flow to the low NOX (nitrous oxides) burner can be adjusted (e.g., based on determinations related to the TEG air flow to the low NOX burner). A low NOX burner capable of operating in a TEG mode that uses a mixture of fresh air and turbine exhaust gas (TEG) as an oxidizer, and also in a fresh air mode in which fresh air (but not TEG) is used as an oxidizer (e.g., and that may be configured to switch seamlessly between these modes). A method of operating a low NOx burner that that includes using TEG and fresh air as an oxidizer to burn fuel, in a TEG mode and, when conditions dictate, such as when the TEG flow has decreased to a pre-determined level (e.g., zero or close to zero), switching from the TEG mode to a fresh air mode.