WSP07913

• File Number: 8277.400.200
• Description: Lower Virgin River Project
• State: NV
• Basin: Colorado Mainstem
• Date: 11/1/1986
• Title: Study of Saline Water Use at the Harry Allen Generating Station - Final Report - November 1986
• Water Supply Pro - Doc Type: Report/Study

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Section 2

POWER PLANT DESCRIPTION

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DATA SOURCES AND ASSUMPTIONS

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The major features of Harry Allen Generating Station assumed in the study are
based on the pulverized coal plant design contained in the Comparative Study
of Integrated Gasification Combined Cycle and Pulverized Coal-Fired
Technologies study which was prepared by the Bechtel Power Corporation and
issued to Nevada Power Company In April, 1986 [2J. Additional information was
received through meetings with Nevada Power Company and from the Allen-Warner
Valley Energy System report which was published in 1976 [3J. In each of these
studies, Clark County secondary treated sewage effluent was assumed as the
plant raw water supply.

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In the Task 4 Study, the plant makeup water and wastewater system design was
varied among several water treatment options to select the best process for
use of Lower Virgin River Unit water.

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POWER PLANT DESCRIPTION

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The present Harry Allen power plant design concept includes four pulverized
coal-fired generating units each with 250 megawatts of net generating
capacity, producing a total net capacity of 1,000 megawatts. The first unit
wil I begin scheduled commercial operation in 1996, followed by the second unit
in 1998, the third unit in 2000 and the fourth unit In 2002. Base-loaded
operation is assumed in the study.

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Plant Siting

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The Harry Allen site Is located approximately 25 miles northeast of Las Vegas,
Nevada in the Dry Lake Valley region near Interstate Highway 15.

Coal DualIty

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The study assumes the use of Surfco coal delivered by rail from central Utah.
Coal qual ity for the Sufco coal is shown in Appendix A. The coal has a
nominal heating value of 12,400 btu/lb, an ash content of 9%, a sui fur content
of 1.2% and an as-received moisture content of 9%.

Raw Water Storage and Treatment System

Raw water for the plant is del ivered by pipeline either from the Clark
County Advanced Wastewater Treatment IAWTJ plant or from the Lower Virgin
River Unit ILVRJ. These water supply sources are described In Section 3.

Raw water from either of the two sources is pumped to an onsite reservoir with
a lD day storage capacity. The raw water demand for the power plant varies
with the water treatment process options.

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