In a big win for renewable energy, the cost of solar and wind power has plummeted in recent years, making it the same price as traditional fossil fuels in about 30 countries, according to a new report from the World Economic Forum (WEF). The cost of solar energy has dropped 80% since 2009, and wind energy has dropped by 30% in the last three years. This shift means more countries have reached “grid parity” — where the cost of fossil fuels and renewable energy are the same.