Change of energy efficiency investment, R&D spending and patent filings related to energy efficiency, 2015-2023

Last updated 18 Jun 2025

Download chart
Sources

IEA analysis based on data from IEA (2024), World Energy Investment (https://www.iea.org/reports/world-energy-investment-2024); IEA (2024), Energy Technology RD&D Budgets (https://www.iea.org/data-and-statistics/data-product/energy-technology-rd-and-d-budget-database-2#energy-technology-rdd-budgets); WIPO (2025), Patentscope (https://patentscope.wipo.int/search/en/search.jsf).

Related charts

Capital cost differentials between the top refining producer and the rest of the world, 2025

Open

Global investment in selected clean energy technology manufacturing by country/region, 2020-2025

Open

Global investment in selected clean energy technology manufacturing by technology, 2020-2025

Open