Page 3, conditions for hFE include Vce = 1v, for Ic = 10ma - 2amp.
That's 1w dissipation for Ic = 1amp.
Thermal resistance for to92 is 100 - 200c/w (max 150c/w for this device) -> 150c temperature increase.
The Vce(sat) chart provides you with better indication (typical) of driving the chip into saturation: 10x - 50x. So your drive requirement is anywhere from 100ma - 20ma, typical.
No margin for error.