PETITION OF NORTHERN INDIANA PUBLIC SERVICE COMPANY LLC FOR (1) AUTHORITY TO MODIFY ITS RATES AND CHARGES FOR GAS UTILITY SERVICE THROUGH A PHASE IN OF RATES; (2) APPROVAL OF NEW SCHEDULES OF RATES AND CHARGES, GENERAL RULES AND REGULATIONS, AND RIDERS; (3) APPROVAL OF REVISED DEPRECIATION RATES APPLICABLE TO ITS GAS PLANT IN SERVICE; (4) APPROVAL OF MECHANISM TO MODIFY RATES PROSPECTIVELY FOR CHANGES IN FEDERAL OR STATE INCOME TAX RATES, UTILITY RECEIPTS TAX RATES, AND PUBLIC UTILITY FEE RATES; (5) APPROVAL OF NECESSARY AND APPROPRIATE ACCOUNTING RELIEF; AND (6) AUTHORITY TO IMPLEMENT TEMPORARY RATES CONSISTENT WITH THE PROVISIONS OF IND. CODE § 8‐1‐2‐42.7.