Strenght training uses a lot of energy due to the intensity and recovery. If you are keeping the other stuff and adding this you will use mor energy.
That said the chances that your plan will be set up to allow for genetics, metabolism and body weight are slim to none. You will know your body better than they do so keep good balance and increase a small amount first adding more if needed.
One thing to be careful of when using strength training is seeing an increase in weaight and freaking out. Lean mass will come from this training and is very heavy. If you lose a pound of fat and gain 2 of muscle your body would look virtually the same but the scales will show a pound gained. Also remember that your water levels will vary so leave the scales out of this one as much as you can.
One thing I would say is that gaining strength without gaining any weight, including muscle, is really tough and uses a lot of energy. Be interesting to see what your program contains because for full on power-lifting where you want strength at low weight you are in rep ranges 6 and below virtually all of the time.