From the OECD, official development assistance (ODA) and other official flows (OOF) to developing countries together comprise the public financial support that donors provide to developing countries for renewable energy. These flows are defined as the sum of official loans, grants, and equity investments that “DAC countries” (ODA recipients listed by the Development Assistance Committee) receive from foreign governments and multilateral agencies for clean energy research to develop and produce renewable energy (including in hybrid systems). The OECD consolidates and categorises these figures as self-reported by donors; these figures are extracted from the OECD/DAC Creditor Reporting System (CRS) as bulk downloads starting in the year 2000 and then filtered to reflect public investments in clean energy by excluding commitments with blanks or zeroes. Then, purpose codes are filtered to include clean energy investments.

Finally, private donor flows (mostly philanthropic organizations) are removed from the data (https://stats.oecd.org/Index.aspx?DataSetCode=crs1).