Batteries cannot make renewables reliable Steve Milloy | Saturday, April 27, 2019 ยท 1:41 PM | Energy storage It would cost an estimated $3.6 BILLION worth of batteries to back up a 100MW (smallish) wind farm so that it could supply a single day’s worth of power. Source: CFACT Web | PDF Share this:ShareTwitterFacebookRedditWhatsAppTumblrLinkedInEmailPrint