The main forms include senior debt, junior or subordinate debt, low-interest loans, lease finance or up-front payments. As such, it can be seen as ‘middle-risk -middle-return’ financing. A mezzanine investment can be structured in various forms. Although typically a subordinated loan, it may also comprise preference shares or convertible bonds. For example, solar power plants receive a high amount of investment subsidies in the form of up-front payments and tax incentives and much less debt.