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Airborne noise (AN) levels were measured at workshops in the premises of boiler and turbine compartments (BTCs) of the Mosénergo heating and power plants (HPPs) for T-250/300-240 turbine units and their auxiliary equipment, and the results were analyzed. During the simultaneous operation of the equipment, the primary sources of elevated AN levels were identified. Despite the apparent popularity, simplicity, and extent of examination of the problem, it is yet to be resolved at thermal power plants (TPPs), although the primary sources of noise at TPPs and means of controlling them have long been known and detailed in the literature. An important result inferred from the measurements and their analysis was the absence of a completely diffused AN field in the BTC premises. This enabled us to establish the locations of the sources of elevated AN levels (e.g., location of the brush assembly of a generator exciter), and it suggested that the installation of local soundproof casings can provide necessary reduction in AN levels. Further, it indicated that possible solutions for reducing noise at the BTC workshops of HPP include the improvement of sound proofing and absorption utilizing new, highly effective scientific and technical developments. Particularly, the issue can be mitigated by employing a new, low-frequency, heavy rubber coating. The data and recommendations obtained for the T-250/300-240 turbine units can be used for other types of turbine units at Russian TPPs with similar equipment. [ABSTRACT FROM AUTHOR]