Lower cost to store power signals end to daytime-only supplies Solar developers adding batteries to projects around the world The world’s biggest-ever solar project — a $200 billion venture in Saudi Arabia — comes with a “batteries included” sticker that signals a major shift for the industry. SoftBank Group Corp. partnered with the oil-rich Saudis this week to plan massive networks of photovoltaic panels across the sun-drenched desert kingdom. The project is 100 times larger than any other proposed in the world, and features plans to store electricity for use when then sun isn’t shining with the biggest utility-scale battery ever made. The daytime-only nature of solar power has limited its growth globally partly because the cost of batteries was so high. Utilities that get electricity from big solar farms still rely on natural gas-fired backup generators to keep the lights on around the clock. But surging battery supplies […]