The Northern Indiana Public Service Co. v. Porter County Chapter of the Izaak Walton League of America, Inc., et al., 1975 case revolved around a dispute over whether or not the Federal Power Commission (FPC) had jurisdiction to issue licenses for construction and operation of hydroelectric projects on non-navigable tributaries that affected interstate commerce waters. The Supreme Court ruled in favor of Northern Indiana Public Service Company (NIPSCO), stating that FPC did have authority under Section 23(b) of the Federal Power Act to license such projects if they were located on navigable waters or directly impacted them through their operations. This decision upheld FPC's broad regulatory power over water resources affecting interstate commerce, even when those resources are non-navigable tributaries.

The dissenting opinion in the case of Northern Indiana Public Service Co. v. Porter County Chapter of the Izaak Walton League of America, Inc., argued that there was no need for a federal court to abstain from hearing a case just because state administrative proceedings were ongoing. The dissent pointed out that both federal and state courts have concurrent jurisdiction over many matters, including this one involving environmental concerns related to public utilities. It also noted that allowing such abstention would effectively give states veto power over federal jurisdiction, which is contrary to the Constitution's Supremacy Clause. Furthermore, it warned against creating an unnecessary barrier for citizens seeking redress in federal courts by requiring them first to exhaust all possible remedies at the state level before they can bring their claims federally.