HAWAII ELECTRIC LIGHT COMPANY, INC. ENERGY COST ADJUSTMENT FACTOR

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2 ATTACHMENT 1 REVISED 8/31/17 HAWAII ELECTRIC LIGHT COMPANY, INC. ENERGY COST ADJUSTMENT FACTOR EFFECTIVE DATES 8/01/17 9/01/17 Change Composite Cost Generation, /mmbtu , Dispersed Generation Energy, /kwh Purchased Energy, /kwh Residential Schedule "R" Energy Cost Adjustment - /kwh (3.643) (2.447) Others- "G.J.P.F" Energy Cost Adjustment - /kwh (3.643) (2.447) Residential Customer with: 500 KWH Consumption - $/Bill $ $ $11 ' KWH Consumption - $/Bill $ $ $13.35

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5 ATTACHMENT 3 SHEET 1 OF 10 Hawaii Electric Light Company, Inc. FUEL OIL INVENTORY PRICES FOR September 1, 2017 INDUSTRIAL FUEL COSTS: HILO PUNA Average Industrial Fuel Cost- $/BBL Land Transportation Cost - $/BBL Industrial Costs For Filing- $/BBL Conversion Factors- mmbtu/bbl Industrial Costs For Filing - /mmbtu DIESEL FUEL COSTS: KEAHOLE PUNA CT-3 Average Diesel Fuel Cost- $/BBL Land Transportation Cost- $/BBL Diesel Costs For Filing - $/BBL Conversion Factors - mmbtu/bbl Diesel Costs For Filing - /mmbtu 1, , HILO , ULSD FUEL COSTS: KEAHOLE WAIMEA Average ULSD Fuel Cost - $/BBL Land Transportation Cost - $/BBL ULSD Costs For Filing- $/BBL Conversion Factors - mmbtu/bbl ULSD Costs For Filing - /mmbtu 1, , DISPERSED HILO GENERATION , , Dispersed Generation, cents per kwh COMPOSITE COST OF DISP. GEN. BBis Fuel: $/BBIInv Cost: Fuel $ (Prod Sim Consumption x Unit Cost) Net kwh (from Prod Sim) 5,000 cents/kwh:

6 ATTACHMENT 3 SHEET 2 OF 10 HAWAII ELECTRIC LIGHT CO., INC. Estimated Weighted Average August 2017 SHIPMAN INDUSTRIAL BBL COST HILL INDUSTRIAL BBL COST COST PER BARREL EXCLLT LT Total Balance at 07/31/ ,S23 1,967, Less: Est'd Inventory Addn Purchases: Estimate ransfers out: Estimate xxxxxx xxxxxxxxxxxxxxxx xxxxxx xxxxxxxxxxxxxxxx xxxxxx xxxxxxxxxxxxxxxx xxxxxx xxxxxxxxxxxxxxxx 0 xxxxxxxx xxxxxxxxxxxxxxx xxxxxxxx xxxxxxxxxxxxxxx xxxxxxxx xxxxxxxxxxxxxxx xxxxxxxx xxxxxxxxxxxxxxx ransfers in: Estimate 0 0 (32,012) ( 1,491,665.04) 32,633 1,545, Consumed: Estimate ,039 1,601, {32,120) (1,580,249.40) Balance Per G/L 07/31/ ,063 2,042, Purchases xxxxxx xxxxxxxxxxxxxxxx xxxxxxxx xxxxxxxxxxxxxxx ransfer out xxxxxx xxxxxxxxxxxxxxxx xxxxxxxx xxxxxxxxxxxxxxx ransfer in 0 23,900 1,168, Consumed 0 {28,137) (1,320,176.79) Balance@ 08/31/2017 lnv From Offsite/Transfers Est'd Inventory Addition ,826 1,890, Fuel Balance@ 08/31/ ,826 1,890, Reverse Fuel Balance Fuel Avg Price XXX XXX XXX XXX xxxxxxxx (1,890,698.27) xxxxxxxx 1,908, /01/2017 Avg Price 0 37,826 1,908, Weighted Avg Cost/BBL by Location #DIV/0! Weighted Avg Cost/BBL@ Avg Cost #DIV/0!

7 ATTACHMENT 3 SHEET 3 OF 10 HAWAII ELECTRIC LIGHT CO., INC. Estimated Weighted Average August 2017 PUNA INDUSTRIAL BBL COST LAND TRANSP COST PER BARREL EXCLUDE LT LT TOTAL Balance at 07/31/2017 5, , , Less: Est'd Inventory Addition 0 Purchases: Estimate xxxxxxxxxxxx xxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxx xxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxx!transfers out: Estimate xxxxxxxxxxxx xxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxx xxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxx Transfers in : Estimate (2,940) {134,133.70) {3,S1S.48) 3,421 1S6, , Consumed: Estimate 3, , , {3,508) (172,587.64) (4,023.33) Balance Per G/L 07/31/2017 6, , , Purchases xxxxxxxxxxxx xxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxx Transfer out xxxxxxxxxxxx xxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxx Transfer in 2, ,519 3, Consumed (2,515) (118, ) (2,884.71) Balance@ 08/31/2017 Inventory From Offsite/Transfers Est'd Inventory Addition 6, , , Fuel Avg Price 6, , , Reverse Fuel Balance Fuel Avg Price xxxxxxxxxxxx xxxxxxxxxxxx {300, ) xxxxxxxxxxxxxxxxxxxxx 307, xxxxxxxxxxxxxxxxxxxxx 09/01/2017 Avg Price 6, , , Weighted Avg Cost/BBL by Location Weighted Avg Avg Cost

8 ATTACHMENT 3 SHEET 4 OF 10 HAWAII ELECTRIC LIGHT CO., INC. Estimated Weighted Average August 2017 KEAHOLE CT COST LAND COST PER BARREL HS Diesel BBL GALLONS EXCLUDE LT TRANSP EXCLUD LT LT TOTAL Balance at 07/31/ , ,155, ,328, ,880.6 Less: Est'd Inventory Addition Purchases: Estimate ~ransfers out: Estimate xxxxxxxxxxxxxxx xxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxx xxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxx ~ransfers in : Estimate (47,126.6) {1,979,317.0) {3,047,914.7) {133,999.8) 46, ,969, ,058, , Consumed : Estimate 47, ,013, ,261, , (49,419.4) (2,075,613.0) {3,258,569.1) {136,618.8) Balance Per G/L 07/31/ , ,082,772 3,340, , Purchases xxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxx ~ransfer out xxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxx!transfer in 46, ,968, ,570, , Consumed (50,974.7) (2,140,937.0) {3,307,115.6) (144,915.95) Balance@ 08/31/ , ,910,215 3,603, , Inventory From Offsite/Transfers Est'd Inventory Addition Fuel Avg Price 45, ,910,215 3,603, , Reverse Fuel Balance Fuel Avg Price xxxxxxxxxxxx xxxxxxxxxxxxxxx xxxxxxxxxxxx xxxxxxxxxxxxxxx {3,603, ) xxxxxxxxxxxxxxxxxx 3,609,171.0 xxxxxxxxxxxxxxxxxx 09/01/2017 Avg Price 45, ,910,215 3,609, , Weighted Avg Cost/BBL by Location Weighted Avg Avg Cost

9 ATIACHMENT 3 SHEET 5 OF 10 HAWAII ELECTRIC LIGHT CO., INC. Estimated Weighted Average August 2017 PUNA CT-3 HS Diesel COST BBL GALLONS EXCLUD LT LAND TRANSP COST PER BARREL EXCL LT LT TOTAL Balance at 07/31/2017 5, , , ,S61.3 Less: Est'd lnven Addition Purchases: Estimate xxxxxxxxxxxxxxxxx xxxxxxxxxxxxx xxxxxxxxxxxx xxxxxxxxxxxxxxxxx xxxxxxxxxxxxx xxxxxxxxxxxx!transfers out: Estimate xxxxxxxxxxxxxxxxx xxxxxxxxxxxxx xxxxxxxxxxxx xxxxxxxxxxxxxxxxx xxxxxxxxxxxxx xxxxxxxxxxxx Transfers in : Estimate (4,282.8) (179,877.0) (270,588.8) (4,748.8) 3, , , ,381.9 Consumed: Estimate 2, , , ,403.2 (2,362.1) (99,210.0) (155, 7S2.9) (2,782.6) Balance Per G/L 07/31/2017 5, , , , Purchases xxxxxxxxxxxx xxxxxxxxxxxxxxxxx xxxxxxxxxxxxx xxxxxxxxxxxx Transfer out xxxxxxxxxxxx xxxxxxxxxxxxxxxxx xxxxxxxxxxxxx xxxxxxxxxxxx Transfer in , , Consumed (2,062.2) (86,611) (133,788.42) (2,357.68) Balance@ 08/31/2017 lnven From Offsite/Transfers Est'd Inventory Addition 4, , , , Fuel Balance@ 08/31/2017 4, , , , Reverse Fuel Balance Fuel Avg Price xxxxxxxxxxxx xxxxxxxxxxxxxxxxx (296,446.06) xxxxxxxxxxxx xxxxxxxxxxxx xxxxxxxxxxxxxxxxx 319, /01/2017 Avg Price 4, , , , Weighted Avg Cost/BBL by Location Weighted Avg Cost/BBL@ Avg Cost

10 ATTACHMENT 3 SHEET 6 OF 10 HAWAII ELECTRIC LIGHT CO., INC. Estimated Weighted Average August2017 HS Diesel TOTAL HILO HS-DIESEL COST LAND BBL GALLONS EXCLUDE LT TRANSP COST PER BARREL EXCL LT LT TOTAL Balance at 07/31/ , ,659 1,867 Less: Est'd lnven Addition Purchases: Estimate xxxxxxxxxxxx xxxxxxxxxxxx xxxxxxxxxxxx xxxxxxxxxxxx xxxxxxxxxxxx xxxxxxxxxxxx Transfers out: Estimate xxxxxxxxxxxx xxxxxxxxxxxx xxxxxxxxxxxx xxxxxxxxxxxx xxxxxxxxxxxx xxxxxxxxxxxx Transfers in: Estimate Consumed: Estimate Balance Per G/L 07/31/ , , , Purchases xxxxxxxxxxxx xxxxxxxxxxxx xxxxxxxxxxxx xxxxxxxxxxxx Transfer out xxxxxxxxxxxx xxxxxxxxxxxx xxxxxxxxxxxx xxxxxxxxxxxx Transfer in Consumed Balance@ 08/31/2017 lnven From Offsite/Transfers Est'd Inventory Addition 1, , , , Fuel Avg Price 1, , , , Reverse Fuel Balance Fuel Avg Price xxxxxxxxxxxx xxxxxxxxxxxx -112, xxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxx 127, xxxxxxxxxxxx Total@ 09/01/2017 Avg Price 1, , , , Weighted Avg Cost/BBL by Location Weighted Avg Cost/BBL@ Avg Cost

11 ATTACHMENT 3 SHEET 7 OF 10 HAWAII ELECTRIC LIGHT CO., INC. Estimated Weighted Average August 2017 KEAHOLE DIESEL ULSD COST BBL GALLONS EXCLUDE LT LAND TRANSP COST PER EXCLUD LT BARREL LT TOTAL Balance at 07/31/2017 2, , , , Less: Est'd Inventory Addition 0.0 Purchases: Estimate (190.0) (7,980) (12,230.58) ,922 12, (540.25) Transfers out: Estimate xxxxxxxxxxxx xxxxxxxxxxxxxxx xxxxxxxxxxxx xxxxxxxxxxxx xxxxxxxxxxxxxxx xxxxxxxxxxxx Transfers in: Estimate (9) Consumed: Estimate ,011 12, (218.7) (9,186) (15,302.51) (542.46) Balance Per G/L 07/31/2017 2, , , , Purchases ,903 15, Estimated Purchases Transfer in Consumed (135.5) (5,693) (10,073.79) (390.61) Balance@ 08/31/2017 Inventory From Offsite/Transfers Est'd Inventory Addition 2, , , , Fuel Avg Price 2, , , , Reverse Fuel Balance Fuel Avg Price xxxxxxxxxxxx xxxxxxxxxxxx xxxxxxxxxxxx xxxxxxxxxxxx (164,607.01) xxxxxxxxxxxx 164, xxxxxxxxxxxx Total@ 09/01/2017 Avg Price 2, , , , Weighted Avg Cost/BBL by Location Weighted Avg Avg Cost

12 ATTACHMENT 3 SHEET 8 OF 10 HAWAII ELECTRIC LIGHT CO., INC. Estimated Weighted Average August 2017 WAIMEA DIESEL COST LAND COST PER BARREL ULSD BBL GALLONS EXCLUDE LT TRANSP LT TOTAL Balance at 07/31/2017 1, , , , Less: Est'd lnven Addition Purchases: Estimate (7,915) (12,115.56) 7, ,832.9 (446.41) Transfers out: Estimate xxxxxxxxxxxxx xxxxxxxxxxxxxxx xxxxxxxxxxxx xxxxxxxxxxxxx xxxxxxxxxxxxxxx xxxxxxxxxxxx Transfers in: Estimate (2.5) (104) Consumed: Estimate ,633 17, (205.8) (8,643) (15,256.44) (484.56) Balance Per G/L 07/31/2017 1, , , , ULSD Purchases ,913 15, Estimated Purchases - 0 Transfer in xxxxxxxxxxxx 156 #DIV/0! Consumed (172.0) (7,222) (12,779.36) (404.90) Balance@ 08/31/2017 lnven From Offsite/Transfers Est'd Inventory Addition 1, , , , Fuel Avg Price 1, , , , Reverse Fuel Balance Fuel Avg Price xxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxx xxxxxxxxxxxxx (113,959.83) xxxxxxxxxxxx 114, xxxxxxxxxxxx 09/01/2017 Avg Price 1, , , , Weighted Avg Cost/BBL by Location Weighted Avg Avg Cost

13 ATTACHMENT 3 SHEET 9 OF 10 HAWAII ELECTRIC LIGHT CO., INC. Estimated Weighted Average August 2017 KANOELEHUA DIESEL COST LAND ULSD BBL GALLONS EXCLUDE LT TRANSP Balance at 07/31/2017 1, , , ,945.5 Less: Est'd Inventory Addition Purchases: Estimate 0.0 1, (776.89) Transfers out: Estimate X X X X X X Transfers in : Estimate (723) Consumed: Estimate , (14.5) (609) (880.09) (16.83) Balance Per G/L 07/31/2017 1, , , , ULSD Purchases 0 0 #DIV/0! Estimated Purchases 0 Transfer in (15) (610) (14.21) Consumed (16.6) (698) (1,235.11) (103.00) Balance@ 08/31/2017 1, , , , Inventory From Offsite/Transfers Est'd Inventory Addition Fuel Avg Price 1, , , , Reverse Fuel Balance X X (118,857.53) X Fuel Avg Price X X 117, X Total@ 09/01/2017 Avg Price 1, , , , Weighted Avg Cost/BBL by Location Weighted Avg Avg Cost

14 ATIACHMENT3 SHEET 10 OF 10 HAWAII ELECTRIC LIGHT CO., INC. Estimated Weighted Average August 2017 DISPERSED GENERATION BBL GALLONS COST COST/BBL Balance at 07/31/2017 Less: Est'd lnven Addition Purchases: Estimate Consumed: Estimate ,073 7, xxxxxxxx: xxxxxxxxx (6.8) (284) (508.15) Balance Per G/L 07/31/2017 Purchases Transfer out Transfer in Consumed Balance@ 08/31/2017 Est'd Inventory Addition Fuel Balance@ 08/31/2017 xxxxxxxxxx xxxxxxxxxxx xxxxxxxxxxx xxxxxxxxxx xxxxxxxxxxx xxxxxxxxxxx xxxxxxxxxx xxxxxxxxxxx xxxxxxxxxxx xxxxxxxxxx xxxxxxxxxxx xxxxxxxxxxx ,433 7, xxxxxxxxxx xxxxxxxxxxx xxxxxxxxxxx xxxxxxxxxx xxxxxxxxxxx xxxxxxxxxxx (69.5) (2,918) (5,163.41) ,908 3, ,908 3, Reverse Fuel Balance Fuel Avg Price xxxxxxxxxxxx xxxxxxxxxxxx xxxxxxxxxxxx xxxxxxxxxxxx (3,398.55) xxxx 3, xxxx Total@ 09/01/2017 Avg Price ,908 3,

15 ATTACHMENT 4 HAWAII ELECTRIC LIGHT COMPANY, INC. CONTRACT PRICES EFFECTIVE August 1, 2017 TYPE OF OIL BURNED INDUSTRIAL * Tax 1 Ocean Transportation Storage Wharfage Fees 2 DIESEL* Tax 1 Ocean Transportation Storage Wharfage Fees 2 Tax 1 Ocean Transportation Storage Wharfage Fees 2 Hill Industrial Puna Industrial ~/MBTU $/BBL ~/MBTU $/BBL Hila Diesel Waimea Diesel /MBTU $/BBL /MBTU $/BBL Kana Diesel /MBTU $/BBL CT3 Diesel /MBTU $/BBL ULSD ** Tax 1 Ocean Transportation Storage Wharfage Fees 2 ULSD /MBTU $/BBL Tax includes HGET, Hawaii Use Tax, Liquid Fuel Tax, LUST Tax and Environmental Response Tax. Fees include Custom Duty and Fed Oil Spill Recovery inventory, contract prices for the current month are being provided. Contract prices are considered accurate pending actual delivery of fuel. Land Transportation Costs are shown in Attachment 3, Sheet 1. ULSD includes Waimea, Kanoelehua, and Keahole. Reference: Decision and Order No , Docket No

16 ATTACHMENT 5 SHEET 1 OF 1 Hawaii Electric Light Company, Inc. PURCHASED POWER PRICES FOR September 1, 2017 September 1, 2017 ( /kwh) Floor Rates ( /kwh) PGV (25 MW) PGV (22 MW) -on peak -off peak WAILUKU HYDRO -on peak Other: (<1 00 KW) Sch Q Rate September 1, 2017 ( /kwh) Floor Rates ( /kwh) HEP PGV Addtl 5 MW -on peak -off peak PGV Addtl 8 MW -on peak -off peak

17 ATTACHMENT 6 SHEET 1 OF 1 Hawaii Electric Light Company, Inc. Energy Cost Reconciliation Adjustment September 1 I 2017 Line No Description Amount to be (returned) or collected Monthly Amount C/ 3 x Line 1) Revenue Tax Divisor Total (Line 2 I Line 3) Estimated MWh Sales (September 1 I 2017) Adjustment (Line 4 I Line 5) Amount ($500,800) ($ ) ($183,212) mwh (0.226) /kwh

18 ATTACHMENT 7 HAWAII ELECTRIC LIGHT COMPANY, INC Cumulative Reconciliation Balance Month (1) YTD FOA Reconciliation (2) (3) (4) FOA Rec FOA Rec Adjust Less Try to Q1r Variance Variance Collect (5) (6) Month-end Cumulative Collect Balance November 791,200 [3] 44, ,825 (263,733) (262,906) 565,708 December 15 (263,733) (256,311) 309,397 January 16 (263,733) (264,541) 44,856 February (282,600) [4] 10,260 (292,860) 94,200 95,382 (152,622) March 94,200 96,004 (56,618) April 94,200 97,345 40,727 May - 2,320,900 [1] 2,178 2,318,722 (773,633) (790,776) 1,568,673 June (773,633) (817,839) 750,834 July (773,633) (821,946) (71,112) August 645,200 [2] (58,204) 703,404 (215,067) (232,600) 399,692 September (215,067) (231,769) 167,923 October (215,067) (232,984) (65,061) November 785,400 [3] (82,548) 867,948 (261,800) (268,646) 534,241 December (261,800) (283,626) 250,615 January 17 (261,800) (265,764) (15,149) February 1,366,400 [4] (46,589) 1,412,989 (455,467) (473, 124) 924,716 March (455,467) (479,559) 445,157 April (455,467) (478,693) (33,536) May 445,100 (1) (45,713) 490,813 (148,367) (154,562) 302,715 June (148,367) (151,295) 151,420 July (148,367) (157,548) (6, 128) August 500,800 [2] (32,349) 533,149 (166,933) NOTES: Col(1): Quarterly FOA reconciliation amounts. (Refer to Attachment 6) A positive number is an over-collection. A negative number is an under-collection. Col(2): FOA reconciliation adjustment variance accumulated during the last three months, starting with the fourth prior month; the difference between the estimated recorded sales used to derive the $/kwh adjustment and the actual recorded sales. (Coi(5)-Col(4)) Col(3): FOA reconciliation generated in the current quarter. The YTD FOA reconciliation difference minus the adjustment variance. Co1(1 )-Col(2) Col(4): Amount that the FOA reconciliation adjustment is trying to collect. (Col(1) * 1/3) Col(5): collected amount. (recorded sales * $/kwh adjustment/ ) Col(6): Cumulative balance of the FOA reconciliation (Previous balance + Col(3) + Col(5))

19 ATTACHMENT 8 REVISED 8/31/17 Hawaii Electric Light Company, Inc. Residential Bill at 500 KWH/Month Consumption ~ -c 0 ~... Cl) $250 $245 $240 $235 $230 $225 $220 $215 $210 c. $205 Ill... $200..! 0 c $195 $190 $185 $180 $175 $170 $165 $160 $155 $150 $145 $140 $135 $130 $125 LO.c T"""(]) ~u. c m...,

20 ATTACHMENT 9A REVISED 8/31/17 HAWAII ELECTRIC LIGHT COMPANY, INC. FUEL OIL ADJUSTMENT FACTOR DATA EFFECTIVE DATE FUEL FACTOR CENTS/ KWH RESIDENTIAL & RESIDENTIAL BILL ($) KWH January 1, February 1, March 1, April1, May 1, June 8, July 1, August 1, September 1, October 1, November 1, December 1, January 1, February 1, March 1, April 1, May 1, June 1, July 1, August 1, September 1, October 1, November 1, December 1, January 1, February 1, March 1, April1, May 1, June 1, July 1, August 1, September 1,

21 ATTACHMENT 98 REVISED 8/31/17 HAWAII ELECTRIC LIGHT COMPANY, INC. RESIDENTIAL SURCHARGE DATA EFFECTIVE DATE DESCRIPTION OF SURCHARGE RATE 1/1/2016-1/31/2016 PURCHASED POWER ADJUSTMENT CLAUSE 1/1/ /30/16 GREEN INFRASTRUCTURE FEE 2/1/2016-2/29/16 PURCHASED POWER ADJUSTMENT CLAUSE 3/1/2016-3/31/16 PURCHASED POWER ADJUSTMENT CLAUSE 4/1/2016-4/30/16 PURCHASED POWER ADJUSTMENT CLAUSE 4/1/2016-4/30/16 SOLARSAVER ADJUSTMENT 5/1/2016-5/31/16 PURCHASED POWER ADJUSTMENT CLAUSE 5/1/2016 SOLARSAVER ADJUSTMENT 6/1/2016-6/30/16 PURCHASED POWER ADJUSTMENT CLAUSE 6/1/2016 RBA RATE ADJUSTMENT 7/1/2016-7/31/16 PURCHASED POWER ADJUSTMENT CLAUSE 7/1/2016 GREEN INFRASTRUCTURE FEE 7/1/2016 RESIDENTIAL PBF SURCHARGE ADJUSTMENT 8/1/2016-8/31/16 PURCHASED POWER ADJUSTMENT CLAUSE 9/1/2016-9/30/16 PURCHASED POWER ADJUSTMENT CLAUSE 10/1/ /31/16 PURCHASED POWER ADJUSTMENT CLAUSE 11/1/ /30/16 PURCHASED POWER ADJUSTMENT CLAUSE 12/1/ /31/16 PURCHASED POWER ADJUSTMENT CLAUSE CENTS/KWH DOLLARS/MONTH CENTS/KWH CENTS/KWH CENTS/KWH CENTS/KWH CENTS/KWH 00 CENTS/KWH CENTS/KWH CENTS/KWH CENTS/KWH DOLLARS/MONTH CENTS/KWH CENTS/KWH CENTS/KWH CENTS/KWH CENTS/KWH CENTS/KWH 1/1/2017-1/31/2017 PURCHASED POWER ADJUSTMENT CLAUSE 1/1/2017 GREEN INFRASTRUCTURE FEE 2/1/2017-2/28/17 PURCHASED POWER ADJUSTMENT CLAUSE 3/1/2017-3/31/17 PURCHASED POWER ADJUSTMENT CLAUSE 4/1/2017-4/30/17 PURCHASED POWER ADJUSTMENT CLAUSE 4/1/2017-4/30/17 SOLARSAVER ADJUSTMENT 5/1/2017-5/31/17 PURCHASED POWER ADJUSTMENT CLAUSE 5/1/2017 SOLARSAVER ADJUSTMENT 6/1/2017-6/30/17 PURCHASED POWER ADJUSTMENT CLAUSE 6/1/2017 RBA RATE ADJUSTMENT 7/1/2017-7/31/2017 PURCHASED POWER ADJUSTMENT CLAUSE 7/1/ /17 GREEN INFRASTRUCTURE FEE 7/1/2017 RESIDENTIAL PBF SURCHARGE ADJUSTMENT 8/1/2017-8/31/17 PURCHASED POWER ADJUSTMENT CLAUSE 9/1/2017-9/30/17 PURCHASED POWER ADJUSTMENT CLAUSE 8/31/2017 Interim Rate Increase /31/2017 RBA RATE ADJUSTMENT CENTS/KWH DOLLARS/MONTH CENTS/KWH CENTS/KWH CENTS/KWH CENTS/KWH CENTS/KWH 00 CENTS/KWH CENTS/KWH CENTS/KWH CENTS/KWH DOLLARS/MONTH CENTS/KWH CENTS/KWH CENTS/KWH PERCENT ON BASE CENTS/KWH **Base charges include customer charge, demand charge, energy charge, power factor adjustment, voltage discount, and minimum charge.

22 ATTACHMENT 10 REVISED 8/31/17 Hawaii Electric Light Company, Inc. Calculations of the Average Residential Customer Bill Rate 8/01/17 9/01/17 Charge ($) at 500 Kwh 8/01/17 9/01/17 Difference Base Rates Base Fuel Energy Charge Non-fuel Fuel Energy Charge First 300 kwh per month Next 700 kwh per month Customer Charge Total Base Charges effective date: 4/9/2012 4/9/2012 /kwh /kwh /kwh /kwh $ $81.24 $81.24 $62.72 $62.72 $33.61 $33.61 $29.11 $29.11 $10.50 $10.50 $ $ Interim Rate Increase 2016 TV RBA Rate Adjustment Purchased Power Adj. Clause PBF Surcharge DSM Adjustment SolarSaver Adjustment Energy Cost Adjustment Green Infrastructure Fee %on base 00% % /kwh /kwh /kwh /kwh /kwh /kwh (3.6430) (2.4470) $ $9.08 $7.27 $3.16 $13.58 $13.76 $2.12 $2.12 -$ $12.24 $1.18 $1.18 $9.08 -$4.11 $0.18 $5.98 Avg Residential Bill at 500 kwh $ $ Increase (Decrease-) %Change Rate 8/01/17 9/01/17 Charge ($) at 600 Kwh 8/01/17 9/01117 Difference Base Rates Base Fuel/Energy Charge Non-fuel Fuel Energy Charge First 300 kwh per month Next 700 kwh per month Customer Charge Total Base Charges effective date: 4/9/2012 4/9/2012 /kwh /kwh /kwh /kwh $ $97.49 $97.49 $77.27 $77.27 $33.61 $33.61 $43.66 $43.66 $10.50 $10.50 $ $ Interim Rate Increase 2016 TV RBA Rate Adjustment Purchased Power Adj. Clause PBF Surcharge DSM Adjustment SolarSaver Adjustment Energy Cost Adjustment Green Infrastructure Fee %on base 00% % /kwh /kwh /kwh /kwh /kwh /kwh (3.6430) (2.4470) $ $10.89 $8.72 $3.79 $16.30 $16.51 $2.55 $2.55 -$ $14.68 $1.18 $1.18 $ $4.93 $0.21 $7.18 Avg Residential Bill at 600 kwh $ $ Increase (Decrease-) %Change