When this happens is a very pleasant feeling, I can feel my whole body filled with energy,
Hi
The above is an aspect of "samatha" and purification.
However, if you can see how this process works (for example see what state of mind leads to this purification and pleasant feeling), this is an aspect of "vipassana", i.e., seeing cause & effect, i.e., the relationship between mind & body.
Generally, the relaxation of the mind or "letting go" of craving leads to the body calming down & blissing out like this.
It is a counter intuitive process. The more you let go of desire & relax into the present moment, the more the body is at ease & happy.
feeling all the body charged up with energy/light
The body ("rupa") is comprised of a nervous system, which is also electrical. Therefore, when the nerves relax and become pure, they also bliss out, which feels like electricity.
When this purification & blissing out is complete, the mind enters "jhana". This is why jhana is called "rupa jhana". It means "jhana" born from the bliss of the body's ("rupa's") nervous system.
but I am not sure if this is Vipassana or not and if I should continue focusing on the whole body or just relax, let is calm down, keep equanimity and continue the scan (this is difficult at this point as there is a lot of feeling everywhere) I can maximize this feeling it if I focus enough, like when you focus on your hands and feel them but in a much extreme way.
Its not really "vipassana". "Vipassana" means seeing dhamma realities such as: (i) cause & effect; (ii) impermanence; (iii) unsatisfactoriness; and (iv) not-self.
However, the occuring of "vipassana" cannot occur without "samatha". The Buddha taught "samatha" & "vipassana" occur simultaneously or in-tandem. For example, if the mind has "vipassana" ("insight"), the mind will "let go". When the mind "lets go", the mind, breathing & body will relax or be tranquil & happy, which is "samatha".
I suggest to follow your intuition in your post and let your body relax & purify itself from tension, which causes pleasant feelings.
The basic Goenka instructions is generally a "beginner's" guide. However, after you meditate regularly, internal processes start to occur automatically that are independent of your will. Therefore, you should allow these natural processes to mature towards purification.
In this process of purification, the mind will become more clear and "vipassana" ("insights") will also occur due to the increasing clarity & sensitivity. Therefore, "samatha" ("tranquility") and "vipassana" ("insight") work together and enhance eachother.
Sometimes, samatha may predominate for a while. Then vipassana will predominate for a while. But its best when they both occur together. They will develop themselves naturally. Just sit back, with equinimity, and let the processes unfold.
Kind regards