 NRG Energy Inc. NRG, -0.99 said Tuesday it will pay 12 a share or 2.8 billion in cash for Vivint Smart Home Inc. VVNT, -4.67 and assume 2.4 billion of the companys debt for a total deal value of 5.2 billion. The price of 12 a share is a 33 premium to Vivints closing share price on Monday. 