In this variation, the Energy Services Company (ESCO) implements Energy Efficiency (EE) measures, including equipment that allows for flexibility, but the Demand Response (DR) service is delivered directly by an external aggregator that aggregates flexibility from different customers towards the flex requestors (typically Distribution System Operator (DSO)/Transport System Operator (TSO) or possibly a Balance Responsible Party (BRP)).

In this case, the role of the ESCO is just to provide the technology and manage the availability of the equipment and active control software, but the explicit DR contract (incl. the service level agreement) is typically signed between the Owner occupier and the Aggregator. The aggregator, in turn, provides flexibility to a Distribution System Operator/Balance Responsible Party/Transport System Operator who is willing to pay certain fees for its use.

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