2) With the new ICPT implementation, if your electricity monthly usage is above 1500kwh , you will be charged about rm150 extra monthly .

But with solar system , it is almost impossible to reach 1500kwh . As during day time when the solar is generating electricity, it will actually supply to your home electricity before sending the surplus back to the grid .

Example :
Monthly usage 1600kwh , solar generated 1500kwh .

But the meter will show 900kwh , solar generated 800kwh .

Coz the 700kwh is tallies during the day use .

Some updates,

During daytime the solar electricity generated is used to offset our usage. But night time is entirely from TNB supply.
Since I got visitors stayed for 3-4 weeks, my Aug & Sep usage were above 1500kw, TNB will not offset these readings even though I have surplus of 600kw.

I was charged the ICPT penalty. So instead of getting the 2sen subsidy, now I was charged 10sen for the 15++ usage ( actually is 12sen since no 2 sen sub). An extra of RM180 if 1500kw used....
Then only they will deduct the surplus stored 600kw.

So my bills came up to RM600+ since solar generation also low .. last month usage was 1470kw, my bill is RM3xx only. So beware not to cross the magical 1500kw usage from TNB.

Cheers.