The BB is the beginning of space-time. Before that, there was independent space and independent time, not connected as space-time. There is no energy before space-time, since photons have wavelength; space, and connected frequency; time. Before that merger, that we had wavelengths and frequencies, but not yet permanently connected as energy; photons
The analogy is Joe and Jane get married, with the bond of marriage analogous to the forming of space-time. This ceremony marks a new beginning, away from being single, to being part of a team. Marriage; space-time, does not mean Joe and Jane did not each have a life, before marriage. There was a time and place, when each was single and each could make decisions apart from each other. The wife; Jane, may not want her husband Joe thinking too much about those older days, since he was wild back then. She would prefer him think, that their life began, with their marriage vows; BB.
I my model, we have separated space and separated time, first. Next, we have space-time. The time=0 occur at the transition between the two states; marriage of space with time for a new beginning.
If we started the universe, where space and time are not connected, one could initially move in time without the constraint of space and move in space without the constraint of time. This allows for infinite possibilities like omnipresence. This state would define infinite complexity and therefore a state of infinite entropy.
When space and time merge into space-time; singularity, and finite limits are placed, there is a drastic decrease in complexity and entropy. This will be very exothermic; energy for the BB. Since our universe is finite the energy decrease needed to form the primordial atom would be finite, separated space and separated time would still exist; infinite complexity. This potential in entropy results in the drive of the 2nd law; space-time or limited entropy, returning to divided space and time or infinite entropy.
The free energy equation is G=H-TS, where G is free energy, H is enthalpy, T is temperature in degree K, while S is entropy. Since free energy G= 0, just before space-time forms; before photons; t=-0, we can rewrite the equation as H=TS. H or enthalpy is a measure of internal energy such as is within mass/substance; E=MC2, needed to bind space-time.
S is not energy, rather TS has the units of energy. Even if we had a huge entropy S value, at absolute zero; free energy will not appear, just the entropy; state variables. We will have lots of entropy S; states, both no temperature for free energy creation; TS. We will need the tiniest amount of temperature, so ST=H=mass/energy can become finite; let there be light!