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Low-Cost Backup Power. According to Generac, the new CorePower System offers all the safety and convenience of an automatic standby power supply at a price only a little higher than that of a portable generator. The 7-kilowatt unit comes prepackaged with a 50-amp transfer switch and eight circuit-breakers. It operates on natural gas or liquid propane and is at least 10 decibels quieter than competitive units, the company says. Prices start at $1,700. Generac Power Systems, 888/436-3722, www.generac.com