The variability of power supply from wind and solar projects is a concern for utilities, but the International Energy Agency (IEA) says that by following its roadmap more than 30% of annual electricity demand can be met from wind and solar at little additional long-term cost.

The IEA’s ‘The Power of Transformation’ study, released 26 February, says that as much as 45% of variable renewable energy (VRE) can be integrated without significantly increasing power system costs in the long run. However, “cost-effective integration calls for a system-wide transformation. Moreover, each country may need to deal with different circumstances in achieving such a transformation.” (CONTINUED - 573 WORDS)