WSP10545

• File Number: 8240.200.30.B
• Description: UCRBRIP Instream Flow Approprations
• State: CO
• Basin: Colorado Mainstem
• Date: 12/12/1995
• Author: UCRBRIP
• Title: Base Flow Recommendations Colorado River at Top of 15-Mile Reach
• Water Supply Pro - Doc Type: Data

.,

Electrical Power Estimates for Proposed
Tamarack/South Platte River Pumping Plant.

,

Brad Wind, NCWCD
June 12,1995

,
.

e

An inquiry was made 10 Highline Electric Association (Holyoke, CO; [phone]) regarding
hook-up and power charges associated v.ith the installation of a pumping plant (dectrically
driven) on the Tamarack State Wildlife Area and adjacent to the South Platte River. Based on a
typical operating schedule (demand) consistent with a recharge/augmentation project, I was
informed that a 'Large Power User' (LPU) rale would apply. This same rate has been applied
towards the pumping plants of the Bill Condon Recharge Plan. . .

The LPU rate is based upon both a usage charge (kWh) and a monthly demand charge (kW) and
applies independently to each pumping plant (motor). The LPU rate structure is as follows;

Usage:
Demand:

2.2~ per kWh
$ 7.67 per measured kW per month (November - April)
$12.03 per measured kW per month (May - October)

The measured kW value in the demand charge is based on the maximum 15-minute demand
(kW) oceUi'ring over the coUrse of the billing month. To cover the expense incurred by Highline
for the installation of 'new' transmission lines and meter piule1s"a monthly minimum charge
applies for a period of 5 years. The monthly minimum is equal to 2~ per foot of instalieli'.. .
transmission line per month. The monthly minimum charge is applied lowards the monthly
usage and demand charge. In other words, if the monthly usage and demand charge is greater a
then the monihIy minimum charge, no monthly minimum charge is due. No credit is given for ..
reliring unused transmission lines and/or equipment.

An example of how this rate structure would apply to a pumping planl is as follows. Assume a
100 hp motor is coupled to a submersed turbine pump raled a12,200 GPM (4.9 cfs). The total
head (static + dynamic) against the pump is 110 feet. The pumping plant efficiency (motor
+drive + pump) is 65%. The annual operational schedule for the pumping plant is given in the
following table in the column entitled 'Days Pumped'. Furthermore, 1,200 feet of transmission
line was installed (within the last 5 years) to service the pumping plant. The pumping plant
energy requirement can be calculated as follows:

, .

kW demand = (GPM x head)/(Efficiency x S,304) = 70 kW [94 hp]

Assume 70 kW represents the IS-minute monthly maximum demand.

The daily usage (24-hour day) will then be:

kWh daily usage = kW x 24 = 1,680 kWh

e