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-e 1[i53 Chapter S.--Potential development I - -- 1=' 1:=, . ---e--- As shown on exhibits 5 and 6, the power ~stem tentatively planned for the Initial Development contemplates a modern transmission system more than adequate for the first stage of construction, and would be so designed that integration with-present and future power developr.ents would be facilitated. The pOl'ler system as planned provirles for inter- connections with the potential illue-South Platte Project and the planned Colorado-Big Thompson Project power systems. The transmission system as tentatively planned in this report for tho Initial Development is partially dependont on the potential Blue- South Platte Project transmission system for tho markoting of a portion of the projoct powor am onergy in tho northern part of Colorado. How- ovor if for any roason tho Bluo-South Platto Projoct trahsmission sys- tom is not constructod, an altoma tivo transmission systom for tho Initi8,1 . LQvclopmnt at approximately tho same cost ha.s..boon .planned to !1Ilrkot-- this povlor and onorgy. . . An isolated transmission systom.could be planned at a lesse~_co~t_ to-markot ohly tho Initial I\3volopmont oloctric povlor and onergy loco.-lly., but it is roalizod tffi t thi s would not bo long-rc.ngo planning. It - is bolievod that initial plans should includo a transmission systom of ado'quato size, high enour;h voltage and interconnuctions, dosigned fer futUrtl roquireinents, so tffit it vlOuld not bo outmodod in tho next thirty to fifty yoar s, ovon with unoxpectod loa.d growth. Tho practicability and nood for this kind of planning has boon brought to tho foru in tho prosont pOlvor shortage being oxperiencod throughout the United Statos. Prosont ovorloading of facilitio s and curtailing of power in many casos could havo beon obviated if powor ~stem planning had boon on a long- raIl go basis rather thn.n supplying only iJl1I:1Odia to requiromcnt s. Inter- connoctions with other powor systoms on a regional and inter-regional basis require high voltago transmission. Tho prosont oxtonsivo testa boing made on SOO,Ooo-volt transmission facilities in southorn Ohio at tho Tidd Tost Projoot by eloctric utilitie sand oloctrical mnufacturors indicatos that they aro keonly awaro of tho situ.ation and aro taking stops to plan moro adoquatoly for tho futuro. As indice-tod on oxhibit 6, it can bo soon thn.t tho ontiro Gunnison- Arkansas Project transmission systom in tho Initial LQvolopment would form a loop systom with the potent inl Bluo-South Pla.tto Projoct trans- mission systom by intorconnoctions at tho Dillen substc.tion and'the Colorado Springs substation. A tio at tho Dillon substation is also planned to tho Colorado-Big Thompson Project transmission ~stem, vlhioh in turn connocts with Bureau systems in Wyoming and Nebraska. Thus llD.ltuo.l intorcho.nge of power among tho 80 Buroo.u systoms would roduoo nooossary resorvo capacity and practically insure oontinuity of service. 15