Apparatuses, methods, and systems are disclosed for uplink transmission power allocation. One method includes receiving a configuration of two uplink carriers. The method includes determining whether a configuration parameter corresponding to at least one of a first uplink carrier and a second uplink carrier for a serving cell is configured. The method includes determining whether a total user equipment transmit power for uplink transmissions in a transmission occasion exceeds a maximum user equipment output power, wherein the uplink transmissions comprise a first uplink transmission on the first uplink carrier and a second uplink transmission. The method includes, in response to determining that the total user equipment transmit power for uplink transmissions in the transmission occasion exceeds the maximum user equipment output power, determining a first priority level for the first uplink transmission and a second priority level for the second uplink transmission.