noun
grid connection; grid interconnection
Technical term used in electrical engineering for connecting a power generation system to the utility grid.
太陽光発電システムを系統連系するには、電力会社との協議が必要です。
To connect a solar power system to the grid, consultation with the power company is necessary.
Compound of 系統 (system, grid) and 連系 (interconnection). A modern technical term.