Air Plan Approval; Minnesota; Revision to Visibility Federal Implementation Plan

The Environmental Protection Agency (EPA) is revising the Minnesota Federal implementation plan (FIP) for visibility, to establish emission limits for Northern States Power Company's (NSP's) Sherburne County Generating Station (Sherco), pursuant to a settlement agreement. The settlement agreement, signed by representatives of EPA, NSP, and three environmental groups, was for resolution of a lawsuit filed by the environmental groups for EPA to address any contribution from Sherco to reasonably attributable visibility impairment (RAVI) that the Department of Interior (DOI) certified was occurring at Voyageurs and Isle Royale National Parks.