Not all border towns in Uganda, Kenya, Tanzania, Ethiopia can be connected to respective National grids - e.g Moyale Kenya is so far from Kenya's grid and does not make economic sense to connect it so better to connect it to Ethiopia's grid that is present in Moyale Ethiopia - so the import/export 'merry go round' will continue. Planned interconnection of National grids of Tanzania to Kenya and Ethiopia and Kenya will help in trade of power...which is a good thing for regional economies

Actually this makes sense and it's economical to do that ;)

Guess work informs me that......If/when renewable energy power will be over supplied (which I don't see it being soon)...thermal plants can/will be shut off. 2. Electricity from dams can be stored..ie.store water in reservoirs and allow water to run when there's more demand. Lets not assume that we'll be the first to experience a glut.

Look, if/when power gets cheaper its almost certain that wanjiku gets inspired to acquire more gadgets eg fans/ACs for those living in Kisumu Coast Garisa and other hot areas, bigger TVs fridges electric cookers etc for the middle class, cheap power should also attract more power guzzlers

From the internet

To understand matters of power differentiate the following components and then localize it to kengen/kenya's scenario. 1. Power source, 2. Power production technology, 3. Electric power. The reason why u produce and how to distribute eff. is kplc's main headache.
For kengen thus said:
1. Power sources are
a. Hydropower. Can be stored so long as the threshold effective production ranges are observed. Ie. There is margin between minimum dam heig depth/altitude n minimum power uptake n maximum installed capacity vv demanded power
B. Geothermal power. As for Hydro however in other context it's steadier n not so sensitive to weather parterns
C. Hydrocarbon(gas, diesel.... .) Ditto to a n b but insignificant sensitivity to weather cycles
D. Wind and solar. Difficult to store the power sources and varies wildly in a days cycle though cheap
... Other power sources are insignificant in kengen case n do not count
2. Production technology.
This highly depends on the powering medium. Ie power source. However the chosen tech suffer challenges as regards demand cycles n thus enabling storage or limiting it or impending storage of the power source.
Eg.
Water must flow thro a turbine for power production. Below a certain level effective turbine dynamics are unsustainable and production must be stopped.
Gas already burnt in a turbine has to be expelled with or without powering the grids
For this fora technology is irrelevant and a sunk cost
3.electric power. Yes, Power producers ultimate goal. Once produced it must be consumed then n there. Use may be constructive or destructive. If over destructive. If under destructive or in effective. So much production and consumption is so critical that without it u better not be in the biz of power matters. Large scale power storage is possible tho not popular and not efficient. In kengen case storage is not a priority for now considering integrated EA scenario is excess production in one country coincides with related excess dd in another, ie variant whether cycles for heavily hero power (weather sensitive) dependent economies:-regional economies as well.
All in all large scale power storage is costly.

Not entirely correct: remember the connection (for example) between Kenya and Uganda is high voltage (132KV) and can therefore not supply any consumers directly. It goes to substations and gets step downed to distribution voltages. The infrastructure part though is a fair point because as @VVS said, a glut of generated power has to go somewhere before the generators react or get shut down in an orderly fashion.

As for the debate about grid power storage, my contribution is that it is safe to assume in Kenya and East Africa, we do not yet have any serious storage facilities. For our traditional utilities (Kengen, KPLC), there is probably none. The only one that I heard of is what @VVS posted a link to (Powerhive?) which is using solar to supply rural households in Kisii and therefore must have reasonable storage. For large scale, we probably are waiting for Tesla..