Minutes - Public Works Committee - 01/17/2012

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Option 1 has no annual savings but the cost is going to be $26,412 dollars a year Dusk till Dawn is 4,000 hours, we have built into that equation that we know that there are some lights that are going to be on 24 hours a day. The second option is to change the design to include fluorescent lights. Metal halides are already built into the design. The cost to put in each fixture is roughly the same as it is to put in the fluorescent. The third option is to change everything out with fluorescents and retrofit the existing structures. He stated it is the retrofit that is most expensive. Director of Public Works/Principal Engineer Olson reviewed the rebates in Option 3 with the Committee. Councilmember McGlone stated in this case the payback on the energy and the payback on the retro, all of which he cannot see doing. It would take in some cases 20 years to payback one portion of that and 4 -5 years to pay back the rest. He also stated the idea of thinking about the future in his opinion is to just do what we are doing and get into the future. Theoretically, what we want to have will be cheaper or there may be a new technology by then. Chairperson Backous wanted to confirm what Councilmember McGlone is saying is to go with Option No 1. Councilmember McGlone confirmed go with what we got. Councilmember Elvig stated he ran some numbers himself and having metal halide in the future and programmed retrofitting, you have somebody to help pay for it. What he is concerned about is the exterior of the building. There has to be consistency there and staying with metal halide on the exterior. He knows we are going to be burning more lights than we have in the past and he doesn't see that the numbers are there. Chairperson Backous wanted to double check the map and stated when he looks at it there is a 10 year payback. He asked what is the payback? Public Works Director/Principal City Engineer Olson responded it is not a very good payback. He wanted to make sure the Committee and Council had the opportunity to comment on whether we should move forward with the same metal halide lamp fixture and confirmed it is a 10 year payback. Councilmember McGlone commented there are two paybacks you have to look at, the energy savings payback and the payback on the initial investment of upgrades. Mr Offerman summarized that metal halides do degrade over time; fluorescents will maintain full luminance virtually 98% until end of life. The expectancy is 24,000 hour rated lamps, these Public Works Committee / January 17, 2012 Page 4 of 8