Some countries and regions have already achieved or are close to achieving this goal, such as Iceland, Brazil, New Zealand’s South Island, Denmark’s Samsø island, and Germany’s Mecklenburg-Vorpommern and Schleswig-Holstein regions. These examples show that 100% renewable energy is not only feasible but also desirable for a sustainable future.
I don't think these regions depend 100% on renewable energy or are climate-neutral or something. Even if the public/government is using and providing exclusively renewable energy it's not true for private individuals who still drive diesel cars, use natural gas or wood pellets for heating etc. In order to become truly climate-neutral you have to make 100% of population use renewable energy, which is not feasible atm. All in all, this climate/eco/renewable energy situation can be best described with saying "too little too late". We have already passed the point of no return according to ecologists and climate activists and only started doing something to prevent it.