Time of Use Analysis Delivered Water y 9/23/2014 rWave.pptx - PDF document

Time of Use Analysis Delivered Water y 9/23/2014 rWave.pptx CarolloTemplateWater

As part of the Cost of Service analysis, alternative rate structures were reviewed alternative rate structures were reviewed • AHFC recommended that the discussion of DWS Time of Use rates is more appropriate for the WQOPS Committee • Objective of rate restructure would be to increase recycled water deliveries through cost of service based discounts based discounts rWave.pptx CarolloTemplateWater 2

The Agency has available capacity to increase recycled water deliveries increase recycled water deliveries • Quick analysis of 2013 demands reveals: Q y – Nighttime • DWS demand is lowest between midnight and 5 am – Sundays • Deliveries are lower than other days of the week • Unused flows results in roughly 4 mgd to outfall • Unused flows, results in roughly 4 mgd to outfall – Shoulder Months • System is underutilized during 8 months of the year y g y rWave.pptx CarolloTemplateWater 3

CarolloTemplateWater rWave.pptx peaks and lulls peaks and lulls Annual demands illustrate a variety of Acre-Fee et Demand (D Daily) 10 15 20 25 30 35 - 5 1/1/ /2013 1/12 /2013 irrigation season during non-peak Low demands Low demands 1/23 /2013 2/3/ /2013 2/14 /2013 2/25 /2013 3/8/ /2013 3/19 /2013 3/30 /2013 4/10 /2013 4/21 /2013 5/2/ /2013 5/13 /2013 5/24 /2013 6/4/ /2013 6/15 /2013 6/26 /2013 7/7/ /2013 7/18 /2013 7/29 /2013 8/9/ /2013 8/20 /2013 8/31 /2013 Sharp drops reflect 9/11 /2013 Sunday deliveries Sunday deliveries 9/22 /2013 10/3 /2013 10/14 /2013 10/25 /2013 11/5 /2013 11/16 6/2013 11/27 7/2013 12/8 /2013 12/19 /2013 12/30 /2013 4

Cost of service based incentives can be provided based on a number of factors provided based on a number of factors – Nighttime Rates g • Reflect the cost of cheaper “off-peak” electric rates – Sunday Rates • Incentive to utilize the system to its full capacity – Shoulder Season Rates. • Incentive to utilize the system to its full capacity • Incentive to utilize the system to its full capacity • Potential for cost avoidance rWave.pptx CarolloTemplateWater 5

Rates can be designed to efficiently use the system at a benefit to all users the system at a benefit to all users Peak users are paying for Peak users are paying for unused capacity year round. ity Peak usage em Capaci Syste Base usage To incentivize demands, lower prices can be offered at a marginal cost – as the peak users will support fixed expenditures Annual Water Demand rWave.pptx CarolloTemplateWater 6

7 Nighttime Deliveries i D li Ni htti rWave.pptx CarolloTemplateWater

Hourly GPM demand for June 3 2013 10000 9000 8000 7000 6000 5000 6/3/2013 4000 3000 2000 rWave.pptx 1000 0 0 CarolloTemplateWater 8

CarolloTemplateWater rWave.pptx Hourly GPM demand in July 2014  Midnig m  ght to 11 pm 7/1/20 014 7/2/20 014 7/3/20 014 7/4/20 014 7/5/20 014 7/6/20 014 7/7/20 014 7/8/20 014 7/9/20 014 7/10/20 014 7/11/20 014 7/12/20 014 7/13/20 014 7/14/20 014 7/15/20 014 7/16/20 014 7/17/20 014 7/18/20 014 7/19/20 014 7/20/20 014 7/21/20 014 7/22/20 014 7/23/20 014 7/24/20 014 7/25/20 014 7/26/20 014 7/27/20 014 7/28/20 014 7/29/20 014 7/30/20 014 7/31/20 014 Low demands Low demands from midnight to 5 am - 2,000 - 4,000 4,000 - 6,000 6,000 - 8,000 8,000 - 10,000 - 2,000 9

New Storage Tanks will eliminate much of unused flows of unused flows • New tanks were sized to Typical Dry Weather Wastewater Flow Variation Fl V i ti efficiently utilize nighttime flows to fill storage 9.0 8.0 • Tanks will be emptied T k ill b ti d 7.0 during peak demands and 6.0 refilled nightly , mgd 5.0 Typical Summer Typical Summer Flow, Hourly Flow 4.0 • Analysis of available flows Pattern 3.0 Typical Average shows that there is Daily Summer 2.0 Flow insufficient flows to fill insufficient flows to fill 1 0 1.0 tanks and expand 0.0 rWave.pptx nighttime deliveries Time of Da Time of Day CarolloTemplateWater 10

11 Sunday Deliveries i D li d S rWave.pptx CarolloTemplateWater

CarolloTemplateWater rWave.pptx other days of the week other days of the week Sunday deliveries are significantly below Da aily AF Dema and 10 15 20 25 30 35 - 5 1/2/2013 1/13/2013 1/23/2013 2/3/2013 2 2/13/2013 2/24/2013 2 3/6/2013 3/17/2013 3 3 3/27/2013 4/7/2013 4/17/2013 4 4/28/2013 4 Wednesday 5/8/2013 5 5/19/2013 5/29/2013 5 6/9/2013 6/19/2013 6 6 6/30/2013 7 7/10/2013 Sunday 7/21/2013 7 7/31/2013 7 8/11/2013 8 8/21/2013 9/1/2013 9/11/2013 9/22/2013 9 10/2/2013 1 0/13/2013 1 0/23/2013 11/3/2013 1 1/13/2013 1 1/24/2013 12/4/2013 1 2/15/2013 1 2/25/2013 12

Potentially 500 AF of deliveries could be provided provided Annual Acre-Feet Delivered (by day of week) Sunday Monday Tuesday Wednesday Thursday Friday Saturday 832 820 817 768 756 692 171 rWave.pptx CarolloTemplateWater Total 13

What changes can be implemented to capture similar usage? capture similar usage? • Sunday Rotation y Annual Acre-Feet Delivered (by day of week) – As Saturdays and Sunday Monday Tuesday Mondays are peak days, Wednesday Thursday Friday smooth demands over 3 smooth demands over 3 Saturday Saturday days 817 832 820 756 768 • Sunday Rate 692 – Discounted rate to incentivize voluntary Sunday usage – First come first serve 171 rWave.pptx CarolloTemplateWater Total 14

15 Shoulder Months th M ld Sh rWave.pptx CarolloTemplateWater

Shoulder Month pricing, could increase deliveries deliveries 1,400 1,200 1,000 Acre-Feet 800 600 400 Plant operates at peak capacity during 200 summer months If DWS is under the - blue line, plant has rWave.pptx available capacity CarolloTemplateWater Sum of Sum of DWS (AF) Sum of iDWZ Pumping (AF) 16

All demands below the dotted line could be met with DWS be met with DWS 2,000 1,800 1,600 and 1,400 e-Feet Dema 1,200 1,000 800 Acre 600 400 Est. Plant Capacity 200 - rWave.pptx CarolloTemplateWater Sum of Sum of DWS (AF) Sum of Total DWZ Demand 17