Kīlauea Volcano’s lava flow last year not only destroyed hundreds of homes and farms, it damaged and caused the shutdown of a geothermal plant that supplied 25 percent of the Big Island’s power needs. Puna Geothermal Venture intends to be back in the power business again by year-end. Critics question whether the cost of reopening is justified, versus the benefits of investing in other forms of renewable energy. Should Puna Geothermal Restart?