The given data are measured values of active power , measured at the low voltage busbar of the medium voltage (MV)/low voltage (LW) grid connection point (secondary substation). The data are provided as 15-minutes mean values in kilowatt. Data Description p_tei_mean = arithmetic mean of p_tei measured in 1-minute intervals devided by number of samples available for computing within 15 minutes (p_tei_count) p_tei_min = the minimum value (1-minute mean) measured within the period of p_tei_mean (15-minutes) p_tei_max = the maximum value (1-minute mean) measured within the period of p_tei_mean period (15-minutes) p_tei_count = the number a 1-minute mean values available for each15-minute interval. Field Test Setup The substation includes a transformer feeding a low voltage grid, consisting of 89 households, 450kW of installed PV generation capacity, a large scale battery with 300 kW and 850 kWh. This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 864300