To transmit cumulative active energy consumption in kWh from a KNX meter, DPT 13.013 (Active Energy in kWh, signed 32-bit) is more appropriate than DPT 14.056 (Power), which encodes an instantaneous power in W.

The semantic distinction is critical. DPT 13.013 (kWh, signed 32-bit) represents cumulative energy — a counter that only goes up — with a range of about plus or minus 2.1 billion kWh, more than enough for decades of use. DPT 14.056 (W, 32-bit float) represents instantaneous power that varies in real time with the active loads. The two are complementary on a smart meter: 13.013 for billing, 14.056 for real-time monitoring.

Never bind a kWh consumer to a W producer (or the reverse) on the same Group Address — the units silently mismatch and dashboards become meaningless.