Home equity lines of credit that fueled a spending spree during the U.S. property boom are back.

After six years of declines, lending for so-called Helocs will rise 30 percent to $79.6 billion in 2012, the highest level since the start of the financial crisis in 2008, according to the economics research unit of Moody’s Corp. Originations next year will jump another 31 percent to $104 billion, it projected.