Plant open. We are breaking down the pros and cons. This is nbc bay area news tonight. Im raj mathai. We will go to the two exclusive stories in a moment starting with updates on this incoming heatwave. Potential for 100 degrees, maybe more, in parts of the bay area over this labor day weekend. Right now we are being asked to conserve energy. We are under a statewide flex alert to 9 00 a. M. Cal iso says to expect more in the coming days. Pg e is preparing all hands on deck. Staff meteorologists are tracking the weather conditions from a command center in san ramon. They will stage crews in areas that their forecasters say will be most impacted by the heat. There are no planned pg e power shutoffs. Of course, that could change. And in Contra Costa County an unprecedented move. The county is closing hiking trails in concord and walnut creek at the request of the fire department. This weekend is not the weekend that we want the public hiking in the open space where you are far from the p