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17 LARGE COMMERCIAL SERVICE (Contd) Determination of Demand The demand in kilowatts for billing purposes shall be the greatest 15-minute coincident load (subject to power factor adjustment) during the month for which bill is rendered, but in no event shall the demand to be billed be considered as less than 50% of the greatest demand billed during the preceding eleven months, nor less than 3 kw for Service at Secondary Voltage and 25 kw for Service at Primary Distribution Voltage. Minimum Demand to be Billed The monthly demand charge shall not be less than provided above, whether or not energy is used. Power Factor The customer shall at all times take and use power in such manner that the average power factor shall be as near 100% as possible, but when the average power factor is less than 80%, then the demand as determined above shall be adjusted by multiplying it by 80% and dividing the product thus obtained by the average power factor expressed in percent. The average power factor is defined to be the quotient obtained by dividing the kilowatt-hours used during the month by the square root of the sum of the squares of the kilowatt-hours used and the lagging reactive kilovolt -ampere - hours supplied during the same period. Any leading kilovolt -ampere -hours supplied during the period will not be considered in determining the average power factor. Where customer's demand is less than 4o kw the average power factor may at the Company's option be determined by periodic test or measurement. Standby, Supplementary, Emergency and Incidental Service (Alternating Current Only) Availability Available for service to customers who normally supply their requirements either directly or indirectly from another independent source of power for which the Company's service may be substituted wholly or in part. Customer shall contract for capacity adequate to supply the entire electrical requirements for which such service may be used and Company shall not be obligated to supply capacity in excess of the amount con- tracted for by customer. Rate The billing shall be in accordance with the Large Commercial Service rate schedule, except that the paragraph "Determination of Demand" shall be modified to read as follows: "The demand in kilowatts shall be the greatest 15-minute load during the month for which bill is rendered, but in no month shall the demand to be billed be based on less than the greatest demand previously supplied nor on less than the demand contracted for. In addition, for new customers taking service subsequent to January 1, 1965, the demand to be billed shall in no event be considered as less than 100 kw." A