Quantity-based mechanisms are quota obligations (usually by using tradable green certificates) and tendering systems. Priced-based market instruments are feed-in tariffs (FiTs) and feed-in premiums (FIPs), fiscal incentives, such as carbon taxes, or investment grants. Nuclear investors would have to forego the hope of ever recouping their initial outlays on the fixed costs. From an investor point of view, the advent of zero variable cost renewables thus militates against capital-intensive technologies such as nuclear.