|Mill River Park
Owned by the City of Stamford
Near Interlaken Road
(owned by Aquarion?)
I took the following formula from the "How Hydropower Works" website:
Power = (Height of Dam) * (River Flow) * (Efficiency) / 11.8
|Power||The electric power in kilowatts (one kilowatt equals 1,000 watts).|
|Height of Dam||The distance the water falls measured in feet.|
|River Flow||The amount of water flowing in the river measured in cubic feet per second.||43.3|
|Efficiency||How well the turbine and generator convert the power of falling water into electric power. For older, poorly maintained hydroplants this might be 60% (0.60) while for newer, well operated plants this might be as high as 90% (0.90).||80%|
|11.8||Converts units of feet and seconds into kilowatts.|
For Mill River Park dam, I'll assume a height of 8 feet, which gives: 8 * 43.4 * .8 / 11.8 = approximately 23.5 kilowatts.23.5 kilowatts * (24 hours per day) * (365 days per year) = 205860 kilowatt hours per year. As of March 2006, CL&P is charging retail customers $0.16 per kilowatt hour, so this works out to about $33,000 per year. I do not know how much the city is paying per kilowatt hour.
I estimate that the Mill River Pond dam is 8 feet high, and might be increased to 10 feet by the Corps of Engineers. I estimate that the dam near Interlaken Road is 10 feet high.
Links:Connecticut clean energy fund