Wildfires in Northern Californian wine country have so far killed 23 people, and at least 285 more remain missing.The fires have burnt 170,000 acres and around 3,500 structures have been wiped out.For companies that insure wineries in California, this is a known peril. But its also much worse than what people are used to.Larry Chasin, CEO of Pak Programs, an MGA in partnership with Great American Insurance Group , said claims are already flowing in from his insureds facing business interruption, and fire damage to vines, infrastructure, and automobiles.Fire is a covered peril under most every property policy. As underwriters we focus on wildfires in Northern California. Its an exposure were aware of. So most of our efforts are focused on the hillsides but this, this is different, he said.You had multiple wildfires beginning at the same time, going from 200 acres to 35,000-plus overnight [and now up to 170,000 acres]. Were hearing things like, Its an inferno the likes of which weve never seen. This is affecting a very large geographic area.There are upwards of $3 billion of grapes still on the vines in Napa, Chasin said.And those will typically be your higher quality red wine, he noted. Even if fire doesnt rip directly through a vineyard, heat damage could ruin grapes and vines, and also other structures. Some of the burnt vines may grow back and regenerate grapes, while others may need to be replanted. Vines take three or more years to mature.This region doesnt lead in terms of quantity of production, but its often referred to as the top of quality. This is big business, and this is a big tragedy for this industry. Its going to leave a big mark, he said.As an insurer we are fielding claim calls from our insureds. We are staged and ready to get boots on the ground as soon as fires are out and roadblocks are clear.The claims will mostly come from where you might expect, Chasin said. But often operations at vineyards extend further than a visitor might see.There is huge investment in buildings, especially in Napa and Sonoma, he explained. There are going to be lots of structures destroyed. You have agricultural buildings, you have dwellings and guest houses, and entertainment spaces. You have vineyard infrastructure, you have trellises and vines. You have pumping stations, water treatment facilities, water tanks, all those sorts of things and everything melts, basically.There is a business interruption exposure that were seeing already, for tasting rooms that cant open, due to lack of power, and you may have some interruption to production too.