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2. Centre for Climate and Energy Solutions, 2022. US State Electricity Portfolio Standards. Available at: https://www.c2es.org/document/renewable-and-alternate-energy-portfolio-standards/.
3. Regional Greenhouse Gas Initiative (RGGI), 2021. About the Regional Greenhouse Gas Initiative. https://www.rggi.org/sites/default/files/Uploads/Fact%20Sheets/RGGI_101_Factsheet.pdf.
4. Do Renewable Portfolio Standards Deliver Cost-Effective Carbon Abatement?;Greenstone,2020
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