Which of the following is not a common source of project financing?

All of the listed options (Equity, Debt, Grants, and Commercial banks) are common sources of project financing. Equity refers to the ownership interest in a project, where investors provide funds in exchange for a share in the ownership and potential profits of the project. Debt financing involves borrowing money from lenders, which must be repaid over time with interest. Grants are non-repayable funds awarded by governments, organizations, or foundations to support specific projects. Commercial banks provide loans and other financial services to businesses, including project financing. Therefore, all of the options listed are common sources of project financing.