| Rooftops up to 10 kW | Rooftops 10 to 40 kW | Rooftops 40 to 1000 kW | Rooftops 1 to 10 MW | Ground < 10 MW |
| 15% | 30% | 40% | 10% | 5% |
In the first month (November 2012 in this case) 15% of the 435 MW (~65 MW) are installed in the < 10 kW rooftop category which gets a FiT of 17.9 cents/kWh. To calculate the incremental extra annual cost you subtract the Wholesale Cost of electricity (assumed to be 5 cents/kWh) from the FiT rate (17.9 - 5 = 12.9 cents/kWh), multiply this value by the total MW installed in that Bracket (65 MW) and then multiply that total by the expected production which is assumed to be 1000 MWh per MW. I've done this procedure (with some tweaking) for each bracket and summed the total below.
As you can see from the table, over time the incremental cost of each additional 435 MW is less and less because the FiT falls month by month. The sum total extra annual cost I came up with was just under a billion. Interestingly, if you project out the FiT degressions the extra cost of the FiT program go negative in November of 2017 - i.e. If you keep dropping the FiT you actually start saving money over wholesale in about 5 years.
I have mixed feelings here. On the one hand I know the FiT is probably a tad too generous and this means you can shave it down. On the other hand look at how low these extra costs are! Why screw with a good thing when it's cheap to let it ride?
**NOTE: Something about these results doesn't seem right. I suspect I may have dropped something in the math somewhere because this just seems too good to be true. I've double and triple checked things but I keep coming up with the same results. The graph says it all. Germany is in the Home Stretch.
| Year | Rooftops up to 10 kW | Rooftops 10 to 40 kW | Rooftops 40 to 1000 kW | Rooftops 1 to 10 MW | Ground < 10 MW | Total |
| Nov-12 | 5,892,025 | 14,072,798 | 17,654,148 | 3,215,621 | 1,607,811 | 42,442,403 |
| Dec-12 | 5,687,631 | 13,574,166 | 16,995,294 | 3,080,856 | 1,540,428 | 40,878,374 |
| Jan-13 | 5,488,346 | 13,087,999 | 16,352,912 | 2,949,459 | 1,474,730 | 39,353,446 |
| Feb-13 | 5,294,044 | 12,613,987 | 15,726,589 | 2,821,348 | 1,410,674 | 37,866,641 |
| Mar-13 | 5,104,599 | 12,151,824 | 15,115,924 | 2,696,439 | 1,348,220 | 36,417,006 |
| Apr-13 | 4,919,890 | 11,701,216 | 14,520,526 | 2,574,653 | 1,287,327 | 35,003,612 |
| May-13 | 4,761,410 | 11,314,595 | 14,009,674 | 2,470,161 | 1,235,080 | 33,790,920 |
| Jun-13 | 4,606,417 | 10,936,478 | 13,510,062 | 2,367,967 | 1,183,984 | 32,604,908 |
| Jul-13 | 4,454,833 | 10,566,681 | 13,021,440 | 2,268,022 | 1,134,011 | 31,444,987 |
| Aug-13 | 4,306,584 | 10,205,019 | 12,543,569 | 2,170,275 | 1,085,138 | 30,310,585 |
| Sep-13 | 4,161,597 | 9,851,314 | 12,076,210 | 2,074,679 | 1,037,340 | 29,201,140 |
| Oct-13 | 4,019,799 | 9,505,390 | 11,619,133 | 1,981,186 | 990,593 | 28,116,102 |
| Nov-13 | 3,906,335 | 9,228,588 | 11,253,389 | 1,906,375 | 953,188 | 27,247,875 |
| Dec-13 | 3,794,914 | 8,956,768 | 10,894,228 | 1,832,910 | 916,455 | 26,395,275 |
| Jan-14 | 3,685,498 | 8,689,841 | 10,541,532 | 1,760,768 | 880,384 | 25,558,023 |
| Feb-14 | 3,578,052 | 8,427,719 | 10,195,184 | 1,689,924 | 844,962 | 24,735,841 |
| Mar-14 | 3,472,539 | 8,170,315 | 9,855,071 | 1,620,355 | 810,178 | 23,928,458 |
| Apr-14 | 3,368,926 | 7,917,544 | 9,521,080 | 1,552,039 | 776,020 | 23,135,609 |
| May-14 | 3,267,178 | 7,669,324 | 9,193,100 | 1,484,952 | 742,476 | 22,357,030 |
| Jun-14 | 3,167,261 | 7,425,571 | 8,871,025 | 1,419,073 | 709,537 | 21,592,466 |
| Jul-14 | 3,069,143 | 7,186,206 | 8,554,746 | 1,354,380 | 677,190 | 20,841,664 |
| Aug-14 | 2,972,791 | 6,951,149 | 8,244,161 | 1,290,851 | 645,426 | 20,104,377 |
| Sep-14 | 2,878,173 | 6,720,323 | 7,939,166 | 1,228,466 | 614,233 | 19,380,361 |
| Oct-14 | 2,785,258 | 6,493,652 | 7,639,661 | 1,167,203 | 583,602 | 18,669,377 |
| Nov-14 | 2,694,016 | 6,271,062 | 7,345,547 | 1,107,044 | 553,522 | 17,971,190 |
| Dec-14 | 2,604,416 | 6,052,478 | 7,056,727 | 1,047,967 | 523,983 | 17,285,571 |
| Jan-15 | 2,516,429 | 5,837,828 | 6,773,106 | 989,953 | 494,977 | 16,612,294 |
| Feb-15 | 2,430,026 | 5,627,042 | 6,494,590 | 932,984 | 466,492 | 15,951,135 |
| Mar-15 | 2,345,178 | 5,420,050 | 6,221,087 | 877,041 | 438,520 | 15,301,877 |
| Apr-15 | 2,261,858 | 5,216,784 | 5,952,508 | 822,104 | 411,052 | 14,664,306 |
| May-15 | 2,180,037 | 5,017,177 | 5,688,763 | 768,156 | 384,078 | 14,038,211 |
| Jun-15 | 2,099,688 | 4,821,163 | 5,429,765 | 715,179 | 357,590 | 13,423,385 |
| Jul-15 | 2,020,787 | 4,628,677 | 5,175,429 | 663,156 | 331,578 | 12,819,627 |
| Aug-15 | 1,943,305 | 4,439,656 | 4,925,671 | 612,069 | 306,035 | 12,226,736 |
| Sep-15 | 1,867,218 | 4,254,037 | 4,680,409 | 561,902 | 280,951 | 11,644,517 |
| Oct-15 | 1,792,500 | 4,071,759 | 4,439,562 | 512,638 | 256,319 | 11,072,779 |
| Nov-15 | 1,719,128 | 3,892,763 | 4,203,050 | 464,260 | 232,130 | 10,511,331 |
| Dec-15 | 1,647,076 | 3,716,988 | 3,970,795 | 416,754 | 208,377 | 9,959,990 |
| Jan-16 | 1,576,321 | 3,544,377 | 3,742,721 | 370,102 | 185,051 | 9,418,572 |
| Feb-16 | 1,506,840 | 3,374,873 | 3,518,752 | 324,290 | 162,145 | 8,886,900 |
| Mar-16 | 1,438,609 | 3,208,421 | 3,298,814 | 279,303 | 139,651 | 8,364,799 |
| Apr-16 | 1,371,607 | 3,044,964 | 3,082,836 | 235,125 | 117,563 | 7,852,095 |
| May-16 | 1,305,811 | 2,884,450 | 2,870,745 | 191,743 | 95,872 | 7,348,620 |
| Jun-16 | 1,241,198 | 2,726,825 | 2,662,471 | 149,142 | 74,571 | 6,854,207 |
| Jul-16 | 1,177,749 | 2,572,037 | 2,457,947 | 107,307 | 53,654 | 6,368,694 |
| Aug-16 | 1,115,442 | 2,420,035 | 2,257,104 | 66,226 | 33,113 | 5,891,920 |
| Sep-16 | 1,054,257 | 2,270,770 | 2,059,876 | 25,884 | 12,942 | 5,423,728 |
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