APPROVED February 27, 2018 DIRECTOR of PUBLIC UTILITY DIVISION

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February 27, 2018

February 27, 2018

February 27, 2018

Supplemental Page Fuel Cost Adjustment Factors Public Service Company Oklahoma Fuel Cost Adjustment Factors ($/kwh) Period Service Service Service Service Service Level 1 Level 2 Level 3 Level 4/5 Level 6 Dec 02 Feb 03 0.003728 0.005433 0.006697 0.007836 Mar 03 May 03 0.011235 0.012404 0.012909 0.015861 June 03 Aug 03 0.015371 0.015542 0.015957 0.017454 Sep 03 Nov 03 0.007748 0.009556 0.010113 0.011269 Dec 03 Feb 04 0.007748 0.009556 0.010113 0.011269 Mar 04 May 04 0.010422 0.010662 0.011315 0.012561 June 04 Aug 04 0.014366 0.014653 0.015479 0.017091 Sept 04 Nov 04 0.014841 0.014739 0.015677 0.017511 Dec 04 Jan 05 0.017581 0.018371 0.019341 0.020977 Feb 05 0.017782 0.018097 0.018935 0.020527 Mar 05 May 05 0.012679 0.013641 0.014764 0.014983 0.016727 June 05 Nov 05 0.004477 0.003947 0.004884 0.006360 0.006594 Dec 05 Mar 06 0.024047 0.024642 0.025729 0.028643 0.028877 Apr 06 May 06 0.012135 0.012521 0.014018 0.016218 0.016452 June 06 May 07 0.006712 0.006546 0.008031 0.010065 0.010299 June 07 Apr 08 0.005419 0.007192 0.008444 0.010070 0.010304 May 08 0.005419 0.007192 0.008444 0.010070 0.010070 June 08 Nov 08 0.024398 0.025158 0.026714 0.027786 0.027786 Dec 08 Jan 09 0.005398 0.005809 0.007176 0.008363 0.008363 Feb 09 0.003424 0.003893 0.005284 0.006218 0.006218 Mar 09 Apr 09 (0.009739) (0.009103) (0.007881) (0.007653) (0.007653) May 09 (0.012574) (0.012004) (0.010704) (0.010599) (0.010599) June 09 Dec 09 (0.014161) (0.014248) (0.012931) (0.012792) (0.012792) Jan 10 Mar 10 (0.021086) (0.021915) (0.020036) (0.016130) (0.016130) Apr 10 May 10 (0.001013) (0.000737) 0.000263 0.001606 0.001606 June 10 May 11 (0.003972) (0.003920) (0.002308) (0.000651) (0.000651) June 11 May 12 (0.003419) (0.003464) (0.001316) 0.001888 0.001888 June 12 Feb 13 (0.022249) (0.022194) (0.020504) (0.017696) (0.017696) Mar 13 Oct 13 (0.008476) (0.008764) (0.007217) (0.004760) (0.004760) Nov 13 April 14 (0.012313) (0.012187) (0.010884) (0.008525) (0.008525) May 14 Oct 14 (0.007323) (0.007117) (0.005682) (0.003144) (0.003144) Nov 14 April 15 (0.009975) (0.009970) (0.008574) (0.006169) (0.006169) May 15 Jan 14, 2016 0.029132 0.028993 0.031750 0.035597 0.035597 Jan 15, 2016 Oct 16 0.020560 0.019326 0.020540 0.027577 0.027577 Nov 2016 April 2017 0.026295 0.025206 0.027994 0.035732 0.035732 May 2017 Sep 2018 0.028278 0.028475 0.032592 0.040935 0.040935 Oct 2018 Sep 2019 0.027053 0.029350 0.031861 0.036605 0.036605

February 27, 2018

PUBLIC SERVICE COMPANY OF OKLAHOMA SHEET NO. 72 P.O. BOX 201 EFFECTIVE DATE 1/31/11 TULSA, OKLAHOMA 74102-0201 PHONE: 1-888-216-3523 KIND OF SERVICE: ELECTRIC SCHEDULE: METERING ADJUSTMENT RIDER (MA) AVAILABILITY This Rider is applicable to and becomes a part each Oklahoma Corporation Commission jurisdiction rate schedule in which reference is made to Metering Adjustment. ADJUSTMENT The Company will adjust kilowatt-hours (kwh), kilowatts (kw), and kilovolt-amperes reactive (kvar) for metering located on the high side a company-owned transformer or for metering located on the low side a customer-owned or leased transformer. The adjustment shall be calculated by multiplying the recorded metered quantities by one and one-quarter percent (1.25%). The adjustment then will be added to or subtracted from, as appropriate, the metered quantities to determine the adjusted metered quantities. Rates Authorized by the Oklahoma Corporation Commission Effective Order Number Cause / Docket Number January 31, 2011 581748 PUD 201000050 January 29, 2009 564437 PUD 200800144

PUBLIC SERVICE COMPANY OF OKLAHOMA SHEET NO. 73 P.O. BOX 201 EFFECTIVE DATE 1/31/11 TULSA, OKLAHOMA 74102-0201 PHONE: 1-888-216-3523 KIND OF SERVICE: ELECTRIC SCHEDULE: REGULATORY ASSESSMENT RIDER (RA) APPLICABILITY This Rider applies to all retail monthly customer billings rendered, and shall be included as a part the customer charge, minimum bill charge or other applicable monthly charge as set out on each individual rate schedule. COMPUTATION RA = (A + O/URA) / (AMCB x Y) WHERE: RA = Rider Amount A = Annual assessment amount as billed by the Commission pursuant to OAC 165:5-3 O/URA= Over/Under Recovery Amount determined by subtracting the total amount the assessment collected pursuant to the above formula for the previous July 1 through June 30 period from the total Commission assessment for that fiscal year period AMCB = Estimated Average Monthly Customer Billings ADJUSTMENTS TO BILLING Tax Adjustment Y = Twelve months The amount calculated at the above rate is subject to adjustment under the provisions the Company's Tax Adjustment Rider. TERMS OF PAYMENT Monthly bills are due and payable by the due date. Monthly bills unpaid by the due date will be assessed a late payment charge 1 ½ percent the total amount due. Rates Authorized by the Oklahoma Corporation Commission Effective Order Number Cause / Docket Number January 31, 2011 581748 PUD 201000050 January 29, 2009 564437 PUD 200800144

Supplemental Page Regulatory Assessment Fee Rider July 2004 June 2005 $0.11 July 2005 June 2006 $0.12 July 2006 June 2007 $0.12 July 2007 June 2008 $0.15 July 2008 Dec 2008 $0.15 Jan 2009 June 2009 $0.17 July 2009 June 2010 $0.18 July 2010 June 2011 $0.15 July 2011 June 2012 $0.16 July 2012 June 2013 $0.18 July 2013 June 2014 $0.28 July 2014 June 2015 $0.25 July 2015 July 2015 $0.20 Aug 2015 June 2016 $0.23 July 2016 June 2017 $0.41 July 2017 June 2018 $0.19 July 2018 June 2019 ($0.02)

February 27, 2018

February 27, 2018

Supplemental Page Southwest Power Pool Transmission Cost Factors SPPTC Effective Residential Commercial Industrial Industrial Industrial Date Secondary SL 4&5 SL 3 SL 2 SL 1 12/20/2011 $0.000754 $0.000572 $0.000439 $0.000358 $0.000327 11/28/2012 $0.001329 $0.000985 $0.000757 $0.000590 $0.000559 09/27/2013 $0.002230 $0.001659 $0.001291 $0.000970 $0.000911 09/29/2014 $0.002554 $0.001918 $0.001505 $0.001080 $0.001040 Residential Commercial Industrial Industrial Industrial Industrial Secondary SL 4&5 SL 3 kwh SL 3 kw SL 2 kw SL 1 kw * 04/30/2015 $0.002554 $0.001918 $0.001505 $0.74 $0.55 $0.40 09/29/2015 $0.003221 $0.002365 $0.001815 $0.87 $0.56 $0.50 09/28/2016 $0.003773 $0.002739 $0.002015 $0.94 $0.67 $0.53 12/30/2016 $0.003802 $0.002744 $0.001830 $0.85 $0.68 $0.62 09/27/2017 $0.005378 $0.003999 $0.002426 $1.17 $1.08 $0.70 ** 2/28/2018 $0.005539 $0.004172 $0.002413 $1.18 $1.14 $0.80 09/27/2018 $0.004762 $0.003693 $0.002310 $1.14 $1.05 $0.54 *starting with compliance tariffs from PUD 201300217, SPPTC charges for SL 1, 2, & 3 will be billed based on maximum monthly billing demands. PSO will maintain a SL 3 kwh rate to be applied to the new Primary Non-Demand rate code 299 only. **updated transmission allocation factors for eligible SPPTC expense based on compliance Docket No. 201700151

PUBLIC SERVICE COMPANY OF OKLAHOMA 10TH REVISED SHEET NO. 76-1 P.O. BOX 201 REPLACING 9TH REVISED SHEET NO. 76-1 TULSA, OKLAHOMA 74102-0201 EFFECTIVE DATE: 12/31/2018 PHONE: 1-888-216-3523 KIND OF SERVICE: ELECTRIC SCHEDULE: DEMAND SIDE MANAGEMENT COST RECOVERY RIDER (DSM RIDER) AVAILABILITY DSM Rider is designed to recover costs associated with the Energy Efficiency and Demand-side Management programs (DSM Programs). This Rider is applicable to and becomes part each OCC jurisdictional rate schedule. This Rider is applicable to energy consumption retail customers and to facilities, premises and loads such retail customers. The DSM Factor shall be determined annually for each major rate class using the DSM Program projected costs for that year and any true-up amounts included from the previous year. The DSM Factor will be calculated in accordance with the following methodology. ANNUAL CALCULATION FOR DSM FACTOR Beginning in January 2019, the DSM Factor will be calculated annually for each major rate class with the factor implementation occurring in January Cycle 1. The formula for the DSM Factor is as follows: DSM Factor = (Program cost + DSM true-up for previous period) * Demand or Energy Allocator) / Class Annual kwhs. Program Cost = Projected Demand and Energy Program Cost + Projected Lost Net Revenues + Projected Shared Savings Incentive DSM True-Up = Actual DSM Program Costs + Actual Lost Net Revenues + Actual Shared Savings Incentive - Actual DSM Revenues for the previous period. CALCULATION OF ACTUAL LOST NET REVENUES (Class Projected Annual kwh saved through DSM Programs * Class ECR)*2 Recovery will be two times the projected Lost Net Revenue for the upcoming year programs to be implemented concurrently with projected program costs and shared savings. The projected Lost Net Revenue will be and trued up annually with net verified savings. The Embedded Cost Rate (ECR) in effect at the time the kwh savings occurred will be applied. There is no compounding or accumulation the Lost Net Revenues and the only amount to be carried over in subsequent years will be the true up calculation required in this tariff. Rates Authorized by the Oklahoma Corporation Commission Effective Order Number Cause / Docket Number December 31, 2018 688452 PUD 201800073 February 28, 2018 672864 PUD 201700151 December 30, 2016 657877/658529 PUD 201500208 April 1, 2016 647288 PUD 201500244 April 30, 2015 639314 PUD 201300217 December 21, 2018

PUBLIC SERVICE COMPANY OF OKLAHOMA 10TH REVISED SHEET NO. 76-2 P.O. BOX 201 REPLACING 9TH REVISED SHEET NO. 76-2 TULSA, OKLAHOMA 74102-0201 EFFECTIVE DATE: 12/31/2018 PHONE: 1-888-216-3523 KIND OF SERVICE: ELECTRIC SCHEDULE: DEMAND SIDE MANAGEMENT COST RECOVERY RIDER (DSM RIDER) The ECR is the embedded cost per kwh by class and is calculated by dividing the final revenue allocation by class less revenues associated with the base service charge by class, established in the most recent rate proceeding, by the total class kwh also established for use in that proceeding. The ECR by classes for use in this tariff will be: Participating Class COS $/kwh Residential $ 0.039010 Small Commercial $ 0.032771 Large Commercial & Industrial $ 0.033288 Large Industrial $ 0.015089 ACTUAL SHARED SAVINGS INCENTIVE CALCULATION PSO will calculate the Shared Savings Incentive according to the Commission Rules. The rules for defining the calculation the Shared Savings Incentive can be found in OAC: 165:35-41-8. The projected Shared Savings will be trued up annually with the verified performance the programs. Actual Calculated Shared Savings = Actual shared saving as calculated, by customer classes, resulting from the implementation the Demand and Energy Programs. ALLOCATION FACTORS DF = Demand Allocation Factor for each major rate class (based upon allocators from Order No. 672864 Cause No. PUD 201700151) are as follows: DF Allocator Major Rate Class 47.36% Residential 52.64% Commercial/Industrial * Lighting included in the Commercial Secondary Rate Class Rates Authorized by the Oklahoma Corporation Commission Effective Order Number Cause / Docket Number December 31, 2018 688452 PUD 201800073 February 28, 2018 672864 PUD 201700151 December 30, 2016 657877/658529 PUD 201500208 April 1, 2016 647288 PUD 201500244 April 30, 2015 639314 PUD 201300217 December 21, 2018

PUBLIC SERVICE COMPANY OF OKLAHOMA 10TH REVISED SHEET NO. 76-3 P.O. BOX 201 REPLACING 9TH REVISED SHEET NO. 76-3 TULSA, OKLAHOMA 74102-0201 EFFECTIVE DATE: 12/31/2018 PHONE: 1-888-216-3523 KIND OF SERVICE: ELECTRIC SCHEDULE: DEMAND SIDE MANAGEMENT COST RECOVERY RIDER (DSM RIDER) DEF = Demand/Energy Allocation Factor for each major rate class (based upon allocators from Order No. 672864 Cause No PUD 201700151) are as follows: DEF Allocator Major Rate Class 40.88% Residential 59.12% Commercial/Industrial * Lighting included in the Commercial Secondary Rate Class OPTIONAL PARTICIPATION ADJUSTMENT (OPT OUT) High-volume electricity users as defined in the Commission s Demand Program Rules may elect to not participate in some or all Demand Programs and the corresponding cost recovery by submitting their opt-out decision to the Director Public Utility Division the Commission and to the Company within thirty (30) days after the Company has received final approval its Demand Portfolio. High-Volume Electricity Users who chose to opt out may choose to opt back in, on an annual basis, only to the demand response portion the Demand Programs. To opt back in, on an annual basis High-Volume Electricity Users must: (i) submit thirty (30) days' notice their decision to opt back in to the Director Public Utility Division the Commission and to the Company and, (ii) agree to pay an upfront payment which reflects their calculated contribution to the demand response portion the Demand Portfolio for the annual period for which they are opting in. High-Volume Electricity Users who chose to opt out may not opt back in to more than the demand response portion the Demand Programs unless they agree to pay an upfront payment which reflects their calculated contribution to the Demand Programs recovery for the three-year Demand Portfolio period. Once a High Volume Electricity User has opted out Demand Programs, none the costs any Demand Programs shall be charged to such User, including its affiliate or subsidiary listed on such User's opt out notice, unless and until the User chooses to opt back into the Demand Programs. Rates Authorized by the Oklahoma Corporation Commission Effective Order Number Cause / Docket Number December 31, 2018 688452 PUD 201800073 February 28, 2018 672864 PUD 201700151 December 30, 2016 657877/658529 PUD 201500208 April 1, 2016 647288 PUD 201500244 April 30, 2015 639314 PUD 201300217 December 21, 2018

Supplemental Page PUBLIC SERVICE COMPANY OF OKLAHOMA Demand Side Management Cost Recovery Rider (DSM Rider) Consumer Programs Residential-Secondary Commercial/Industrial Eff Date Energy Demand Total Energy Demand Total 3/3/2010 0.000984 0.000216 0.001200 0.000888 0.000163 0.001051 4/7/2011 0.001737 0.000318 0.002055 0.001588 0.000254 0.001842 3/29/2012 0.001711 0.000280 0.001991 0.001619 0.000233 0.001852 4/1/2013 0.001766 0.000215 0.001981 0.002335 0.000224 0.002559 3/31/2014 0.002324 0.000268 0.002592 0.003486 0.000310 0.003796 3/31/2015 0.002654 0.000271 0.002925 0.003482 0.000274 0.003756 3/31/2016 0.002773 0.000299 0.003072 0.003959 0.000322 0.004281 3/1/2017 0.002542 0.000262 0.002804 0.003840 0.000301 0.004141 9/27/2017 0.002552 0.000263 0.002815 0.004270 0.000328 0.004598 10/26/2018 0.002725 0.000277 0.003002 0.004395 0.000331 0.004726 12/31/2018 0.003102 0.000453 0.003555 0.005026 0.000542 0.005568

PUBLIC SERVICE COMPANY OF OKLAHOMA P.O. BOX 201 ORIGINAL SHEET NO. 80-1 TULSA, OKLAHOMA 74102-0201 PHONE: 1-888-216-3523 EFFECTIVE DATE 08/28/2018 KIND OF SERVICE: ELECTRIC SCHEDULE: TAX CUT AND JOBS ACT OF 2017 ADJUSTMENT RIDER (EXCESS TAX RESERVE) AVAILABILITY: This rider provides retail customers with certain tax benefits associated with the Tax Cut and Jobs Act 2017 that reduces the maximum corporate income tax rate from 35 percent to 21 percent beginning January 1, 2018. Excess Tax Reserve (ETR) rider flows back to customers the estimated Excess Accumulated Deferred Income Tax (ADIT) amounts. APPLICABILITY The ETR Adjustment becomes part each OCC jurisdictional rate schedule in compliance with the Final Order in Docket No. PUD 201700572 (Order), is applicable to Base Rate Charges retail customers served at all service levels and to facilities, premises and loads retail customers, and will remain in effect until the refund has been distributed per the Order. The initial ETR Adjustment factor begins with bills rendered on and after August 28, 2018 through the last December 2018 billing cycle. Subsequent ETR Adjustment factors will refund an annual amount over a twelve-month period beginning in January each year. The factor provides for an adjustment to the monthly Base Rate Charges calculated by multiplying the total the Base Rate Charges contained in the applicable rate schedule by the corresponding percentage. DETERMINATION OF BASE RATE CHARGES Base Rate Charges as used herein includes all charges billed in accordance with the Monthly Rate section the applicable rate schedule which includes, where applicable, the Base Service Charge, the Energy Charge, the Demand Charge, any Minimum Bill Charge, the Reactive Power Charge, and for the lighting tariff schedules, the Facilities Charge. The Adjustment also applies to Standby and Supplemental Service Charges. The Adjustment does not apply to fuel charges or other monthly rider charges. ANNUAL ADJUSTMENT The rider will be recalculated annually to (1) reflect the updated base rate charges reflected in the percentage reduction and (2) account for the over or under refund the prior annual tax benefit. Rates Authorized by the Oklahoma Corporation Commission Effective Order Number Cause / Docket Number August 28, 2018 680821 PUD 201700572 August 10, 2018

Supplemental Page Excess Tax Reserve (ETR) Adjustment Factors Public Service Company Oklahoma ETR Adjustment Factors (% Base Rate Charge) Period Service Level 1 Service Level 2 Service Level 3 Service Level 4/5 Service Level 6 Sep Dec 2018-9.645% -9.645% -9.645% -9.645% -9.645% Jan Dec 2019-2.618% -2.618% -2.618% -2.618% -2.618%

PUBLIC SERVICE COMPANY OF OKLAHOMA 1ST REVISED SHEET NO. 90-1 P.O. BOX 201 REPLACES SHEET NO. 90-1 TULSA, OKLAHOMA 74102-0201 EFFECTIVE DATE 01/30/2018 PHONE: 1-888-216-3523 SCHEDULE NON-STANDARD METERING SERVICE TARIFF AVAILABILITY This schedule is available to any individual customer who requests non-standard metering service and completes the process required to begin receiving non-standard metering service including; signing and returning to PSO the Acknowledgement Form, paying the required, non-refundable One- Time Fee as shown in this tariff, affirming the right PSO personnel to access the non-standard meter or be subject to the Inaccessible Company Equipment Fee, and paying the Monthly Fee detailed in this tariff. By signing the Acknowledgement Form, the customer accepts the fees, requirements, and limitations non-standard metering service as detailed in the Acknowledgement Form. After signing and returning the Acknowledgement Form and paying the applicable One-Time Fee, non-standard metering service will be provided to the customer and the Monthly Fee will be added to the customer s monthly billing. The customer requesting non-standard metering service will continue to be billed according to the applicable standard tariff. SPECIAL CONDITIONS OF SERVICE A customer will be required to pay the One-Time Fee applicable to the customer s Acknowledgement Form. A customer will not be served under this schedule if they fail to return the Acknowledgement Form or pay the applicable, non-refundable One-Time Fee. Service under this schedule will be terminated if a customer does not pay the required Monthly Fee or if access to the Company s nonstandard meter is denied two (2) times. A customer who has requested non-standard metering service may, at any time, terminate non-standard metering and request an AMI meter, at which time the Monthly Fee will no longer be applicable. ONE-TIME FEE $53.55 MONTHLY BILLING $13.21 Effective Order Number Cause / Docket Number January 30, 2018 671469 PUD 201700217 July 14, 2016 654320 PUD 201500109 January 2, 2018