Individual households can practice negawatts through using energy-efficient lighting and Energy Star appliances as well as simply reducing standby power. The resulting savings sometimes offset the investment in new high efficient light bulbs and appliances. These efficiencies can offset a portion of the cost of a residential photovoltaic system. Negawatts reduces the overall size of the photovoltaic system required for the household, because they are consuming less electricity. This results in a faster payback period for the photovoltaic system. The City of San Diego has created a negawatts initiative called "Reduce then Produce" to promote this idea.