Reservation Charge (As set forth on Sheet No. D-2.00)

M.P.S.C. No. 2 GAS Twenty-second Revised Sheet No. D-1.00 Replaces Twenty-first Revised Sheet No. D-1.00 D1. GENERAL TERMS AND CONDITIONS OF THE TARIFF (1) Controlled service. All rates are subject to all provisions in Rule C2. of the Rules and Regulations of the Company which are applicable to priority of service hereunder. (2) Territory served. All rates apply in the territory served by the Company, comprising the cities, villages and townships in all Districts in the applicable Rules and Regulations of the Company except where specifically noted. D2. SUPPLEMENTAL CHARGES Each Rate Schedule may be subject to supplemental charges under Rule C11, Customer Attachment Program, a Reservation Charge and Energy Waste Reduction ( EWR ) surcharges required by Public Act 295, as detailed below: Reservation Charge this charge allows for the recovery of costs related to the assets necessary to provide peak-day coverage and for the utility to serve as the supplier of last resort from Gas Customer Choice program customers, as required by the Commission in Case No. U-15929. For GCR purposes, the Reservation Charge is a component of the Base GCR Factor. Reservation Charge (As set forth on Sheet No. D-2.00) ENERGY WASTE REDUCTION Surcharge this charge permits, pursuant to Section 91(4) of 2008 PA 295, the adjustment of rates, to allow for recovery of the payments made by the Company in compliance with Section 91(1) of 2008 PA 295. Customer Class EWR Surcharge Residential $ 0.1318 per Mcf Small General Service $ 3.92 per meter, per month Large General Service $ 77.55 per meter, per month Commercial Lighting $ 3.68 per contract, per month Special Contracts $ 162.44 per month Transportation - TR-1 $ 40.13 per meter, per month TR-2 $ 137.19 per meter, per month TR-3 $ 823.73 per meter, per month Continued on Sheet No. D-1.01 Issued: December 11, 2017 Effective for service rendered By Theodore Eidukas On and After: January 1, 2018 the Order Dated: December 7, 2017 In Case No: U-18269

(U-17548 UETM Reconciliation) Fourth Revised Sheet No. D-1.01 Replaces Third Revised Sheet No. D-1.01 Uncollectible Expense Tracking Mechanism (UETM) This tariff allows the Company to implement a one-time surcharge of $1.04 in February 2016 business, on a bill rendered basis, on all active accounts except Special Contract accounts. Rate Schedule Surcharge per Active Account ($) All Active Accounts, except Special Contract Accounts $1.04 Continued on Sheet No. D-1.02 Issued: January 20, 2016 By: D. M. Derricks Director Regulatory Affairs Green Bay, Wisconsin Effective for the February 2016 Billing Month Dated: January 19, 2016 In Case No: U-17548

Fifth Revised Sheet No. D-1.02 Replaces Fourth Revised Sheet No. D-1.02 Continued from Sheet No. D-1.01 Revenue Decoupling Mechanism (RDM) Customer bills shall be adjusted by the decoupling, per Mcf, effective November 1, 2016 through October 31, 2017, or ending sooner if the Company recovers the total amount prior to October 31, 2017, on a service rendered basis. Rate Schedule Adjustment $/Mcf Residential (including General and Heating), Transport Aggregated Residential, and Customer Choice Residential. 0.03739 Small General Service (including General and Heating), Transport Aggregated Small C&I, and Customer Choice Small C&I accounts. 0.03834 Continued on Sheet No. D-1.03 Issued: September 26, 2016 Effective for service rendered By: Theodore Eidukas On and After: November 1, 2016 Dated: September 23, 2016 In Case No: U-18051

Second Revised Sheet No. D-1.03 Replaces First Revised Sheet No. D-1.03 This Sheet has been cancelled and is reserved for future use. Continued on Sheet No. D-2.00 Issued: January 20, 2016 By: D. M. Derricks Director Regulatory Affairs Green Bay, Wisconsin Effective for the February 2016 Billing Month Dated: January 19, 2016 In Case No: U-17548

One Hundred Twenty-ninth Revised Sheet No. D-2.00 M.P.S.C. No. 2 GAS Replaces One Hundred Twenty- eighth Revised Sheet No. D-2.00 D3. GAS COST RECOVERY FACTORS The listed monthly Gas Cost Recovery Factors are authorized pursuant to Rule C9, Gas Cost Recovery Clause. Billing Month Authorized Base Factor $/Mcf Maximum GCR Factor Allowed Actual Factor Billed $/Mcf April 2017 $4.1507 $4.1507 $4.1507 May 2017 $4.1507 $4.1507 $4.1507 June 2017 $4.1507 $4.1507 $4.1507 July 2017 $4.1507 $4.1507 $4.1507 August 2017 $4.1507 $4.1507 $4.1507 September 2017 $4.1507 $4.1507 $3.7941 October 2017 $4.1507 $4.1507 $3.7941 November 2017 $4.1507 $4.1507 $3.8241 December 2017 $4.1507 $4.1507 $3.8241 January 2018 $4.1507 $4.1507 $3.7941 February 2018 $4.1507 $4.1507 $3.6941 March 2018 $4.1507 The Maximum GCR Factor Allowed is based upon changes in the NYMEX and adjusted according to Sheet Nos. D-3.00 or D-4.00. The Company will file a revised Sheet No. D-2.00 monthly or as necessary to reflect the factor to be billed the following month. The Company will file by December 31, 2017 for maximum Ga7937s Cost Recovery Factors for April 2018 through March 2019. The Gas Cost Recovery Factor to be charged beginning April 2018 is authorized pursuant to 6(h)(9) of 1982 PA 304, as amended, MCL 460.6h et seq. In addition to the above Gas Cost Recovery Factors, rates are subject to the supplemental charges shown on Sheet No. D-1.00. The GCR is composed of the following cost components: Authorized Base Factor Actual Factor Billed Reservation Charge $0.6441 per Mcf $0.6441 per Mcf Gas Commodity Charge $3.5066 per Mcf $3.0500 per Mcf Continued on Sheet No. D-3.00 Issued: January 17, 2018 Effective for bills rendered for the April 2017 By Theodore Eidukas through March 2018 billing months. the Order dated May 11, 2017 In Case No: U-18154