That "Electric Feel" body sensation during meditation
This feeling is Piti. It is also in sphere of the sensual world hence has the 3 marks of existence. It arises and passes away. You should try to look at it more and more closely until you see it. At some point this will also disappear and turn into either pain or a neutral feeling. When you get the neutral feeling you should be very careful as not to loose the balance of your mind as equanimity is easy in pain and pleasure but hard in this instance. If you examine closely this is also impermanent as you will see things arising and passing. If you see arising and passing of phenomena in each and every part of your body then you are experiencing bhanga-nana. You should see it in remote places in your body also like your earlobes.

This can result either due to Jhana or that through Vipassana where you have either suspended or eradicated (in case of Vipassana) some of you bad Karma which might give you birth in a lower realm for that stretch of time. (In Jhana there is a temporary suspension of the such rebirth linking karma. If you dies with your Jhana you are born in a higher existence.) This does not mean that you can keep them suspended always in Jhana or other periods where some old residual Karma giving you bad rebirth linking result will not surface in the future in the case of Vipassana. Through Vipassana you can eradicate all rebirth linking Karma starting from the lower realms and progressing to higher realm. When you have eliminated all rebirth linking Karma and mind comes to a state it does not acquire any new rebirth linking Karma then you will enter Nirvana. Even when you enter Nirvana you can still have non rebirth linking Karma. Also the present feeling are associated with Karma which you have done with attachment. (Interpretation as per my understanding according of Ledi Sayadaw linage.)

All being said don't get attached to it in any way nor wish for it to pass away.