ESA Seeking Ideas for Space-Based Solar Power
Solar energy generation has grown far cheaper and more efficient in recent years, but no matter how much technology advances, fundamental limitations will always remain: solar panels can only generate power during the daytime, and much of the sunlight is absorbed by the atmosphere during its journey to the ground. What if instead we could collect solar power up in space and beam it down to the surface? ESA is seeking ideas for technologies and concepts for solar power satellites that will do precisely this.
More information here.