A condition that restricts the ability to add or substitute one source of electric power for another on a transmission grid (more simply: congestion occurs when insufficient transfer capacity is available to implement all of the preferred schedules simultaneously)
A specialized security or contract whose value is based on an underlying security or factor such as a price index, and that may include options, futures, forwards, etc.
An agreement in which a purchaser is obligated to take delivery from a seller who is obligated to deliver a fixed amount for a predetermined price at a specific location; such contracts require a daily payment based on the present value of the agreement in the marketplace and are traded on a centralized exchange and have standardized terms
The ability to alter the price of wholesale or retail electricity or services to one's advantage -- and away from competitive levels -- in a competitive market (also called market manipulation)
