NiSource Inc. operates on a fiscal year that ends on December 31. This means that their financial and operational results are reported on an annual basis, concluding with the last day of December. During this period, NiSource focuses on various aspects of its business, including revenue generation, expenses, and performance metrics. Generally, after the fiscal year-end, they prepare and release their financial statements to provide stakeholders with an overview of their business performance over the past year. For more specific details such as recent reports or projections, it may be helpful to refer to NiSource's official website, where current information is likely available.