You're comparing projects using multiple different technologies, and acting as if they are based on the same thing.
They aren't. It's like taking apples, oranges, and pomegranates, and saying they're all apples for purposes of comparison.
You have no way of knowing what the improved fusion plants projects will look like, and yet you make declarative "this will be the case" statements, which may not be your intent, but it comes across as saying you know how Ithillid will do things, when you really don't.
Edit, to clarify: We might get a progress reduction, or an increase on Energy production. Or both. We are *highly* unlikely to get a decrease in Resources per Die, for a long time. (Until Fusion is as mature a technology as fission, at the least.)

...OK then. My argument is that we have never in the length of this quest had a Phase of a main Energy Action in Heavy Industry that gave us more than +16 Energy. This is because at the start of the quest the formula for gains/losses was:
Your numbers are slightly wrong. It is 2^(x-1) for the +s and -s
So 1, 2, 4, 8, etc.
We have broken away from that formula in the meantime, but at this point the next generation of Fusion Power Plants was noted to be:
[ ] Improved Continuous Cycle Fusion Development (Tech)
While the existing CCF plants are certainly functional, there are a number of upgrades that may well lead to improved efficiency over simple water boilers. While this project will be more of an iterative improvement, trying to get a few percent more megawatt hours per plant out of a relatively similar design to current systems, it is likely to see significant further revisions as other fields improve.
(Progress 0/120: 20 resources per die)
more efficient in Energy production, and also more stable when it comes to certain improvements we did in the meantime. Few percent doesn't read like getting +20 Energy to me, it reads like getting +17/+18.
Also:
This is wrong.
Since we already can activate all the dice we have the coming turn we are not resource limited anymore.
And since DAE is currently exactly as dice efficient as none improved fusion, improved fusion should be more efficient, even if we do not know by how much yet.
Thus taking DAE now would cost us dice over the coming 3+ years.
-[] Continuous Cycle Fusion Plants (Phase 10) 0/300 3 dice 60R 26%, 4 dice 80R 80%, 5 dice 100R 98%
We get a Phase of Fusion Plants done in 3-5 Dice. If we are lucky that Phase is more Dice efficient than DAE if we get unlucky it is less Dice efficient than DAE. We have had:
-[X] Continuous Cycle Fusion Plant (Phase 1) 333/350 1 die 20R 100%
[ ] Continuous Cycle Fusion Plants (Phase 1)
First wave continuous cycle fusion plants are still somewhat under development. However, they are ready enough for mass roll out, with only a few kinks in the connection systems remaining before they can be linked to the grid as a whole.
(Progress 372/350: 20 Resources per Die) (+16 Energy) (High Priority)
Q2 and Q3 2058 No Dice on Continuous Cycle Fusion Plants.
-[X] Continuous Cycle Fusion Plants (Phase 2), 6 dice (120 Resources)
[ ] Continuous Cycle Fusion Plants (Phase 2)
With the plant design standardized and more fully tested, it is time to begin rolling out the designs enmasse. While still somewhat more resource intensive than traditional fission plants, they are much faster to build. Furthermore, the completion of this phase would signal the maturing of the cycle plants and mark a milestone in furthering energy security for the GDI.
(Progress 300/300: 20 resources per Die) (+16 Energy) (+5 Political Support)
(Progress 125/300: 20 resources per Die) (+16 Energy)
[ ] Continuous Cycle Fusion Plants (Phase 3)
Mass production of modern fusion systems has substantially replaced the older nuclear systems. While not an immediate need, it is likely to be critically needed as GDI's power needs scale up. Additionally, establishing a reserve of generation capacity will help ensure that damage to the system would not impact greater performances.
(Progress 199/300: 20 resources per Die) (+16 Energy)
[14, 18]
[ ] Continuous Cycle Fusion Plants (Phase 3)
Mass production of modern fusion systems has substantially replaced the older nuclear systems. While not an immediate need, it is likely to be critically needed as GDI's power needs scale up. Additionally, establishing a reserve of generation capacity will help ensure that damage to the system can be made good more easily.
(Progress 258/300: 20 resources per Die) (+16 Energy)
[37]
[ ] Continuous Cycle Fusion Plants (Phase 3)
Mass production of modern fusion systems has substantially replaced the older nuclear systems. While not an immediate need, it is likely to be critically needed as GDI's power needs scale up. Additionally, establishing a reserve of generation capacity will help ensure that damage to the system can be made good on more easily.
(Progress 300/300: 20 resources per Die) (+16 Energy)
(Progress 76/300: 20 resources per Die) (+16 Energy) [95]
[ ] Continuous Cycle Fusion Plants (Phase 4) (Updated)
A fourth major wave of fusion plants will begin to wrap up this generation, as GDI looks to move to marginally more efficient second generation continuous fusion plants. While they are not yet ready, they will be in one to two years, as final testing continues.
(Progress 301/300: 20 resources per Die) (+16 Energy) [71, 42, 13]
[ ] Continuous Cycle Fusion Plants (Phase 5)
With the Initiative's energy needs still substantial, new pods of fusion plants, and expansions to existing ones will be needed to continue pouring resources into the military industrial complex, and provide new weapons in the fight against the Brotherhood of Nod.
(Progress 232/300: 20 resources per die)(+16 Energy) [98, 75]
[ ] Continuous Cycle Fusion Plants (Phase 5) (Updated)
With the Initiative's energy needs still substantial, new pods of fusion plants, and expansions to existing ones will be needed to continue pouring resources into the military industrial complex, and provide new weapons in the fight against the Brotherhood of Nod.
(Progress 330/300: 20 resources per Die) (+16 Energy) [2, 38]
-[X] Continuous Cycle Fusion Plant (Phase 6) 30/300 (5 Dice, 100 R) (98.8% chance)
[ ] Continuous Cycle Fusion Plants (Phase 6) (Updated)
With the Initiative's energy needs still substantial, new pods of fusion plants, and expansions to existing ones will be needed to continue pouring resources into the military industrial complex, and provide new weapons in the fight against the Brotherhood of Nod.
(Progress 300/300: 20 resources per Die) (+16 Energy) (-1 Labor)
(Progress 153/300: 20 resources per Die) (+16 Energy) (-1 Labor)
[ ] Continuous Cycle Fusion Plants (Phase 7) (Updated)
The systematic and continuing construction of additional fusion plants is still ongoing, with GDI expecting to require much more construction, even with improved CCF plants on the horizon.
(Progress 300/300: 20 resources per Die) (+16 Energy) (-1 Labor)
(Progress 67/310: 20 resources per Die) (+16 Energy) (-1 Labor) [40, 39, 48]
[ ] Continuous Cycle Fusion Plants (Phase 8) (Updated)
While the pace of factory construction is likely to decline as GDI stands down from ongoing offensives, more immediate fusion generation is likely to continue to be a high priority. At the same time, there are concerns about the longevity of the class, even with limited evidence for it.
(Progress 243/300: 20 resources per Die) (+16 Energy) (-1 Labor) [25, 93]
[ ] Continuous Cycle Fusion Plants (Phase 8)
While the pace of factory construction is likely to decline as GDI stands down from ongoing offensives, more immediate fusion generation is likely to continue to be a high priority. At the same time, there are concerns about the longevity of the class, even with limited evidence for it.
(Progress 300/300: 20 resources per Die) (+16 Energy) (-1 Labor)
(Progress 137/300: 20 resources per Die) (+16 Energy) (-2 Labor) [71, 65]
[ ] Continuous Cycle Fusion Plants (Phase 9) (Updated)
While the pace of factory construction is likely to decline as GDI stands down from ongoing offensives, more immediate fusion generation is likely to continue to be a high priority. At the same time, there are significant concerns about the longevity of the class.
(Progress 236/300: 20 resources per Die) (+16 Energy) (-2 Labor) [79]
[ ] Continuous Cycle Fusion Plants (Phase 9)
While the pace of factory construction is likely to decline as GDI stands down from ongoing offensives, more immediate fusion generation is likely to continue to be a high priority. At the same time, there are significant concerns about the longevity of the class.
(Progress 300/300: 20 resources per Die) (+16 Energy) (-2 Labor) [35]
1+6+2+1+1+3+2+2+5+3+2+2+1+1 = 32 Dice for 9 Phases of Continuous Fusion Power Plants. So (16X9)/32 = 4.5 Energy per Die. That is without counting the Dice we used in the last quarter of the previous plan to get Phase 1 of Continuous Fusion Power Plants built:
-[X] Continuous Cycle Fusion Plants 0/350 (5 Dice, 100 R) (61% chance to finish)
[ ] Continuous Cycle Fusion Plants
First wave continuous cycle fusion plants are still somewhat under development. However, they are ready enough for mass roll out, with only a few kinks in the connection systems remaining before they can be linked to the grid as a whole.
(Progress 333/350: 20 Resources per Die) (+++++ Energy) (High Priority)
So once again: (16X9)/37 = 3.08 Energy per Die.
If we say that Phase One was different and more expensive and remove it from the calculation then: (16X8)/31 = 4.12 Energy per Die.
Also lets take the average of rolls we have had in Heavy Industry the entire last plan starting with the
winning vote of Q1 2058:
Q1 2058: 25 1
Q2 2058: 34+36+24 = 94 3
Q3 2058: 42+38+86 = 166 3
Q4 2058: 90+19+54+64+5+69 = 301 6
Q1 2059: 14+18+19+85 = 136 4
Q2 2059: 37+72+7+45 = 161 4
Q3 2059: 95+41+81+5 = 122 4
Q4 2059: 71+42+13+18 = 144 4
Q1 2060: 98+75+9+81+99+31+100+71+4 = 568 9
Q2 2060: 2+38+87+89+89 = 305 5
Q3 2060: 95+44+30+17+92+45+73+94+92 = 582 9
Q4 2060: 40+39+48+74+56+76 = 333 6
Q1 2061: 25+93+16+99+22+12 = 267 6
Q2 2061: 71+65+87+23+63+93+83 = 485 7
Q3 2061: 79+29+40+85 = 233 4
Q4 2061: 90+35+22+79+33 = 259 5
25+94+166+301+136+161+122+144+568+305+582+333+267+485+233+259 = 4181
1+3+3+6+4+4+4+4+9+5+9+6+6+7+4+5 = 80
4181/80 = 52.26
So our Heavy Industry Dice were usually rolling a bit above average while our Continuous Cycle Plants Dice were rolling a bit above the DAE Die value if it is +4 E per Die. You know what?
Let's research the Improved Continuous Cycle Fusion:
-[] Improved Continuous Cycle Fusion Development 0/120 1 die 20R 34%, 2 dice 40R 96%
It's only two Die tops. Then we'll see what the new power plants bring. Should put this argument to rest.