In the environmental policy of the Pernambuco Thermoelectric Power Plant, there are plans for monitoring the environmental quality. This study is about the marine phytoplankton community, in the area of influence it has followed a regularity of studies in its catchment channel and in the area of disposal of the submarine outfall. Collections were made every three months, between March 2020 and October 2021. Collections were carried out by trawling 20 µm nets in the area of the submarine outfall and using a Van Dorn oceanographic bottle, inside the catchment channel. from the plant. The taxonomic analyzes showed that in the water catchment channel the genera Chaetoceros and Navicula stood out for their abundance, being represented by 956 and 283 individuals, respectively. At the collection point, the most abundant genera were Pinnularia and Oscillatoria, with 1978 and 559 representatives, respectively.