KNX energy meters typically transmit cumulative energy in DPT 13.010 (4-byte signed counter, Wh).

DPT 13.010 (active energy in Wh) is the standardised KNX datapoint for cumulative energy and is implemented as a signed 4-byte integer, which covers about +/-2.1e9 Wh and therefore a very long meter lifetime. The signed nature also supports negative values for bidirectional metering (export to the grid). Most KNX-certified meters expose this value together with a power object (DPT 14.056) for the current consumption.

Verify whether a meter publishes raw Wh (DPT 13.010) or kWh (DPT 13.013) before scaling - picking the wrong DPT introduces a factor 1000 error in the energy dashboard.