In 2005, Ann Arbor established a moratorium on new street lighting aimed at helping keep costs under control. As part of this cost cutting initiative, the City began trialing LEDs for general lighting purposes. LEDs reduce lighting energy requirements by 50% or more, but their greatest benefit is that they last much longer than conventional bulbs, reducing labor and maintenance costs. In Ann Arbor, this will translate to annual CO2 reductions of 2,200 tonnes and annual savings of @$100 per fixture.
Ann Arbor’s Energy Fund demonstrates that energy efficiency can pay for itself in the long term. Through an initial allocation of $500,000 over five years, and by capturing 80% of the resulting savings, the city has implemented energy efficiency projects in its buildings and throughout the city that pay back their investments in 3-5 years, eliminating the need for additional annual appropriations.
Light-emitting diode (LED) traffic lights are more energy-efficient and have a longer lifetime than conventional incandescent traffic lights. By using LED traffic lights in favour of conventional traffic lights, it is estimated that approximately HK$7.6 million of energy charge could be saved per annum. This will reduce CO2 emissions by 5,300 tonnes.
This program has delivered immediate and sustained reductions in the city’s emissions. LED traffic lights use almost 85% less energy. As a result the city is saving $2.55 million annually in energy savings and $100,000 annually in materials. It is also reducing 23,000 CO2 tonnes annually.