C-E (curtailment – Energy share) map: An objective and quantitative measure to evaluate wind and solar curtailment

As the share of VRE (variable renewable energy) has grown rapidly, curtailment issues have arisen worldwide. This paper evaluates and compares situations in selected countries using an objective quantitative evaluation tool named “C-E map” (curtailment-energy map). The C-E map is a correlation between ratios that mean curtailed wind (or solar) energy per available shares solar). can draw historical trend curve given country/area, as at-a-glance to enable and/or international comparison. also classify countries/areas into several categories, according current levels ratio trends. helps institutional understanding for non-experts including policy makers.