System (102, 202, 302, 502), comprising: - at least one controllable producer (104, 204, 304.1, 304.2, 304.3, 304.3', 504.1, 504.2) configured to produce at least one first energy amount, - at least one non-controllable producer (106, 206.1, 206.2, 306.1, 306.2, 306.2', 306.3, 306.3', 306.3", 506.1, 506.2) configured to produce at least one second energy amount, - wherein the non-controllable producer (106, 206.1, 206.2, 306.1, 306.2, 306.2', 306.3, 306.3', 306.3", 506.1, 506.2) is assigned to the controllable producer (104, 204, 304.1, 304.2, 304.3, 304.3', 504.1, 504.2) to form an electrical producer arrangement (101, 201, 301.1, 301.2, 301.3), - at least one first forecasting means (110, 210, 410) configured to forecast the at least one second energy amount to be produced by the non-controllable producer (106, 206.1, 206.2, 306.1, 306.2, 306.2', 306.3, 306.3', 306.3", 506.1, 506.2) during at least one future time period, and - at least one controlling means (112, 212, 412) configured to control the controllable producer (104, 204, 304.1, 304.2, 304.3, 304.3', 504.1, 504.2) based on the at least one forecasted second energy amount such that total energy amount supplied by the electrical producer arrangement (101, 201, 301.1, 301.2, 301.3) to an electrical network (108, 208) during the future time period corresponds to a predefinable total energy amount characterized in that - the system comprises a peer-to-peer network (222, 322, 522) comprising at least one peer-to-peer application (224, 324, 424), - the at least one peer-to-peer application (224, 324, 424) is executable by at least two nodes (226.1, 226.2, 326.1, 326.2, 326.3, 504.1, 504.2, 506.1, 506.2, 526.1, 526.2) of the peer-to-peer network (222, 322, 522), - the peer-to-peer application (224, 324, 424) is a decentralized register configured to store data and computer code acting as the controlling means (112, 212, 412) and/or first forecasting means (110, 210, 410), - the peer-to-peer application (224, 324, 424) is configured to form an electrical producer arrangement (101, 201, 301.1, 301.2, 301.3) by generating an assignment transaction agreement at least about the assignment of the non-controllable producer (106, 206.1, 206.2, 306.1, 306.2, 306.2', 306.3, 306.3', 306.3", 506.1, 506.2) to the controllable producer (104, 204, 304.1, 304.2, 304.3, 304.3', 504.1, 504.2), and - the at least two nodes (226.1, 226.2, 326.1, 326.2, 326.3, 504.1, 504.2, 506.1, 506.2, 526.1, 526.2) of the peer-to-peer network (222, 322, 522) are configured, after the generation of the assignment transaction agreement, to store the agreement. - at least one controllable producer (104, 204, 304.1, 304.2, 304.3, 304.3', 504.1, 504.2) configured to produce at least one first energy amount, - at least one non-controllable producer (106, 206.1, 206.2, 306.1, 306.2, 306.2', 306.3, 306.3', 306.3", 506.1, 506.2) configured to produce at least one second energy amount, - wherein the non-controllable producer (106, 206.1, 206.2, 306.1, 306.2, 306.2', 306.3, 306.3', 306.3", 506.1, 506.2) is assigned to the controllable producer (104, 204, 304.1, 304.2, 304.3, 304.3', 504.1, 504.2) to form an electrical producer arrangement (101, 201, 301.1, 301.2, 301.3), - at least one first forecasting means (110, 210, 410) configured to forecast the at least one second energy amount to be produced by the non-controllable producer (106, 206.1, 206.2, 306.1, 306.2, 306.2', 306.3, 306.3', 306.3", 506.1, 506.2) during at least one future time period, and - at least one controlling means (112, 212, 412) configured to control the controllable producer (104, 204, 304.1, 304.2, 304.3, 304.3', 504.1, 504.2) based on the at least one forecasted second energy amount such that total energy amount supplied by the electrical producer arrangement (101, 201, 301.1, 301.2, 301.3) to an electrical network (108, 208) during the future time period corresponds to a predefinable total energy amount - the system comprises a peer-to-peer network (222, 322, 522) comprising at least one peer-to-peer application (224, 324, 424), - the at least one peer-to-peer application (224, 324, 424) is executable by at least two nodes (226.1, 226.2, 326.1, 326.2, 326.3, 504.1, 504.2, 506.1, 506.2, 526.1, 526.2) of the peer-to-peer network (222, 322, 522), - the peer-to-peer application (224, 324, 424) is a decentralized register configured to store data and computer code acting as the controlling means (112, 212, 412) and/or first forecasting means (110, 210, 410), - the peer-to-peer application (224, 324, 424) is configured to form an electrical producer arrangement (101, 201, 301.1, 301.2, 301.3) by generating an assignment transaction agreement at least about the assignment of the non-controllable producer (106, 206.1, 206.2, 306.1, 306.2, 306.2', 306.3, 306.3', 306.3", 506.1, 506.2) to the controllable producer (104, 204, 304.1, 304.2, 304.3, 304.3', 504.1, 504.2), and - the at least two nodes (226.1, 226.2, 326.1, 326.2, 326.3, 504.1, 504.2, 506.1, 506.2, 526.1, 526.2) of the peer-to-peer network (222, 322, 522) are configured, after the generation of the assignment transaction agreement, to store the agreement.