Bangladesh produced around 52 TWh in 2014, Pakistan around 93 TWh.
Countries with highest electricity generation | The Shift Project Data Portal
Capacity doesn't mean all that much if a lot of it is sitting with low load factor.
What often matters most is where the electricity is being consumed compared to the total amount anyway. i.e is it being consumed by those with already high economic margins or is it being consumed by those that are growing.
Bangladesh GFCF is around 30% whereas Pakistan is stuck at 13%.
Gross fixed capital formation (% of GDP) | Data | Table
CPEC is very MOU dependent and spread out (judging from this current fiscal years FDI figures so far) and may push Pakistan GFCF to around 20% at most.
Bangladesh is ahead here as well.
Their more than double GFCF means they will not lose steam in the coming years. Rather it is Pakistan that is very CPEC reliant since every other major investor is decreasing their FDI when Pakistan desperately needs investment to prop up its 13% GFCF rate.
The GDP per capita ratio trend is as follows:
Report for Selected Countries and Subjects
Nominal per capita:
1980 Bangladesh was 79% of Pakistan
In 2015 it is now 89% of Pakistan....
There have been dips and swells as you say on both sides at various times.....due to inflation in various years. So lets looks at PPP where price levels are taken into account:
The ratio was:
1980: 59%
1985: 52%
1990: 47%
1995: 47%
2000: 51%
2005: 53%
2010: 63%
2015: 74%
And predicted to be:
2020: 84%
This coincides very well when Bangladesh GFCF increased by leaps and bounds in the mid 90s (crossing the 20% mark and reaching 24% by year 2000).