With a bid duty contract, you agree in writing with the grid operator to use your CSP to upsell or downsell at a specified location against a forecast for that location. With a duty to bid contract, this gives you a duty to make redispatch bids via GOPACS at the request of the grid operator.

A duty to bid contract offers more certainty for both grid operator and connected parties than Redispatch. Thus, the grid operator has the certainty that the congestion problem will be solved and you have the certainty of pre-agreed terms and fees.