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<br />CHAPTER 1 <br /> <br />INTRODUCTION <br /> <br />'. <br /> <br />Description of Plan Concept <br /> <br />The Dunham Point Unit Study is proposed as a result of the expand;np, <br /> <br />demand for electrical power and the growing need to reduce our nation's <br /> <br />dependence on 0;1. <br /> <br />Peaking power plants are nee~ed to make up the diFference 1n daytime <br /> <br />electr{cal d~manr1 w~icl1 occurs het".reen tl,e amount of pONer tltat base lead <br /> <br />plants produce anrl tlte quantity t~at POWP-T consumers wig; to use at anv <br /> <br />~iven time. Peaking power <br /> <br />comhustion-fired or l-tvdroe1.ectric <br /> <br />generating <br /> <br />faci.lities <br /> <br />are: <br /> <br />often <br /> <br />power plants. capahle of quick start UP <br /> <br />or sl-tut down and al,le to fol.1.oW' t'he changes in electrical demand muclt more <br /> <br />efficiently tl,an l)ase 10ao pl.ants. A glossarv of power terms is includecJ <br /> <br />1.n attachment A. <br /> <br />Base load electric generatlng facilities are conunon~v coal-fired or <br /> <br />nuclear power plants wltich ooerate most efficientlv at a constant speed or <br /> <br />output. Tl1ev are cltaracterized by rat'her long start:-up anc1 sl-tut-down <br /> <br />times~ so t'hev tend to produce excess pover at n~g~t hut insufficient <br /> <br />power during t'l1e dav, '.ijI~en there ;.~ a very 1,i.g'1. dp.TT1ano. for electTicltV. <br /> <br />The proposed nunl-tam Point peakin~ poweT plant is known a~ a :Du1l1pet:1 <br /> <br />storage 'hvdroelp.ctrlc facilitv ~ecause W8.t~r is pumped ann stored in a <br /> <br />~lg~ei elevation re$e~voi~ (foTe~av' during ~ow electTica~ dp.mano pP'!ions~ <br /> <br />llsua1.1y oveTnig'1t. Duri.ng l,igl1 powp.r riemand period.s~ the storen '-7ater ; s <br /> <br />released down a penstock or tunnel throu~h '1ydroe1.ectric turhines an(l into <br /> <br />a lower elevation stoTa~e '['e~er\7oi.r (after1,av). T~e electricity pror1uced <br /> <br />hv the turhine~ is used to meet the ,ig~ ~eakin~ rlemands of consumers. <br /> <br />Although pumpin~ t,e water consumes more ener~v t'1an is pronucerl hv <br /> <br />t'he tur~ines. the process noes prove feasi~le fOT several reasons. <br /> <br />'. <br /> <br />,. <br /> <br />2 <br />