WSP08998

• File Number: 8220.200.05
• Description: CRSP - Boulder Dam
• Basin: Colorado Mainstem
• Water Division: 1
• Date: 10/31/1938
• Title: Report of Competitive Value of Falling Water for Primary Energy at Boulder Dam in Competition with Steam Power at the Load Center
• Water Supply Pro - Doc Type: Report/Study

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amount ~ufficient to take care of the loss of the largest

transmi~sion line and the largest steam unit.

I The Ohio Power Company (practically all steam)

finds t at a spinning reserve equal to approximately 20%

of the nstalled capacity owned by it is sufficient to

provide for oontinui ty of sG.rvice .sinoe their system is

nected with a number of other companies such as

Public Service Company and the Ohio ~disonCom-

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e Toledo Edison Company, the Indiana and Micl~lgan.
c Company (~nlich is in turn interconnected with
compan Chicago area); with the Monongahela .West

pany,

Penn J? lic Service Company, the Duquesne Light Company,

iVheeli g Electric Company, Appalac]1ian Electric Company,

the Ke tucky and West Virginia Power Company, etc.

The Union Electric Company 9f Missouri with a

combin tion of hydro and steam generating units supplying

25 and 60 cycle alternating current provides a spinning

oapaci y equal to the capacity of the largest steam unit,

namely 75,000 kw. which combined with adequate frequency

change capacity and a large n1Jlmber 06 transmission oir-

cuits ermits the interchange of 25 and 60 cycle ourrent.

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An analysis of the published statistics
(Elect ical World of I~ay 7, 1938) showing the relation of

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genera ing oapacity to peak demand for a number of Elec-
tric U ilities shows the following:

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A. B. Roberts

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