Why it matters
The return on rooftop and ground-mounted GES investment depends largely on the netting ratio. An industrial facility that produces at midday and consumes in the evening draws energy from the grid during night hours under the hourly system; profile differences invisible under monthly total netting appear on the invoice as net consumption. Hourly netting is administered through the EPİAŞ Unlicensed Generation Module (LÜM); production–consumption matching must be monitored on an hourly basis. The paid generation limit (twice the previous year's consumption) affects sales planning. Facilities in the residential subscriber group continue monthly netting regardless of installed capacity.
Impact on the bill
For netted kWh, the consumer invoice does not show separate "you produced" and "you consumed" double billing; energy offset on an hourly basis is deducted from the net consumption calculation. In hours when production does not cover consumption, grid purchases are billed under the supply contract, SKTT, or regulated supplier tariff. Surplus production (excess energy) is subject to separate sales and limit rules. After the switch to hourly netting, unit cost should be calculated on net consumption rather than gross consumption; profile shift must be considered when comparing with the pre-GES period.
How ENOPTIMAL tracks it
The ENOPTIMAL production management module combines inverter and OSOS data to display the hourly production–consumption profile. Netting scenario analysis tracks which hours generate net consumption and the self-consumption ratio. Multi-site portfolio and inverter brand integrations are supported on the GES production monitoring landing page. Production and consumption are maintained in the same data model for reporting aligned with EPDK rules in our Hourly Netting 2026 guide.