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Page Two <br />September 7, 1953 <br />This means that NSP will now be updating our street lights <br />to modern, more efficient fixtures at no additional cost to <br />you while conserving energy at the same time. The converted <br />lamps will use 33% to 55% less energy and provide 17% to 33% <br />more light output than the lamps they replace, depending on <br />lamp size. In the future, as NSP's costs of producing electric <br />energy rise, the converted street lights should provide you <br />savings in monthly operating costs compared to the relatively <br />inefficient mercury units we are presently using. <br />Because of these many advantages of high pressure sodium street <br />lighting, NSP plans to convert the NSP owned overhead and custom <br />underground street lights in your city to the nearest equivalent <br />light output high pressure sodium. This will always result in <br />slightly more light on your streets. Because this will be a <br />large conversion program (NSP owns more than 70,000 street lights), <br />and because of the necessity of scheduling this conversion work <br />to match available crew time and minimize costs, NSP may not be <br />able to make the conversion when you request it, and will have <br />to schedule the work over several years. Any mercury street <br />lights that require maintenance during this waiting period will <br />be converted to high pressure sodium at no charge. <br />Provided the respective commissions approve NSP's filing, NSP <br />will begin converting NSP owned mercury, incandescent and <br />fluorescent street lights to the high pressure sodium at no <br />charge for the conversion, provided the conversions are made <br />according to NSP's schedule. If conversion is desired prior to <br />NSP's schedule, a one-time charge of $20 per light will be <br />assessed to cover NSP's additional costs. <br />We request your written concurrence with this program. <br />If you have any questions or need further information on this <br />program, contact Jack Jacobson at 770-1347. <br />Very truly yours, <br />NORTHERN STATES POWER COMPANY <br />7 C.i,t- 'ram <br />a e W Faulds <br />Division General Manager <br />Lakeland Division r <br />DWF/r <br />