Installed wind capacity in power systems of selected grid operators

* Does not include grid operators that did not answer to the survey. Respondents account for nearly 80 percent of the total in installed capacity in the country.

According to the source, three complementary methods were used to collect data: a questionnaire was developed, grid operators control centers were visited and a survey of existing literature was conducted. On-site visits allowed the investigators to further explore some of the survey questions through in-depth interviews of operators and other control center personnel.