EPA is approving State Implementation Plan (SIP) revisions to sulfur dioxide (SO<INF>2</INF>) requirements for Northern States Power Company, doing business as Xcel Energy, Inver Hills Generating Plant (Inver Hills), located in Inver Grove Heights, Dakota County, Minnesota. The revisions make the limits of the sulfur content in its fuel and its sulfur dioxide emissions more stringent, and prohibit the burning of residual fuel oil. The revisions allow the facility to use simpler methods to analyze the sulfur content of its fuel. Because the sulfur dioxide emission limits are being reduced, the air quality of Dakota County will be protected.