Power is traded on different marketplaces. In general, the power delivery time frame and the form of the transaction characterize how the market place is defined.
In Over-the-Counter Trading, power is directly traded between two parties, with prices and trading volume agreed in the bilateral negotiations. OTC is the most common form of power trading, especially in the conventional power industry.
Power Purchase Agreement
A Power Purchase Agreement (PPA) often refers to a long-term electricity supply agreement between two parties, usually a power producer and a customer. A power producer is usually seeking a long term income with a PPA, while a consumer is seeking long term power provision.