# The Renewable Heat Incentive Scheme Regulations 2018, Paragraph 2: Calculation of C


(1) For the purposes of regulation 60, C is calculated in relation to a tariff category and an assessment date as follows.
(2) For the purposes of this paragraph—
(a) the first test is met in relation to an assessment date in the first column of the relevant table if, as at that assessment date, the forecast for expenditure in relation to that tariff category exceeds the figure specified for that assessment date in the corresponding entry in the second column of that table;
(b) the second test is met in relation to an assessment date if, as at that assessment date, the increase in expenditure forecast applicable to that tariff category is at least 50% of, but less than 150% of, the figure specified for that assessment date in the corresponding entry in the third column of the relevant table (“the anticipated increase figure”);
(c) the third test is met in relation to an assessment date if, as at that assessment date, the increase in expenditure forecast applicable to that tariff category is at least 150% of the anticipated increase figure;
(d) in relation to an assessment date other than the assessment date which falls on 30th April 2018, the fourth test is met if during the tariff period that immediately preceded the tariff period in which the assessment date falls, the value of C applicable to that tariff category was 0.10 or more,
where the “relevant table” means whichever of Tables 2 to 9 in this Schedule is applicable to that tariff category.
(3) C is 0 unless the circumstances set out in sub-paragraph (4) or (5) (a), (b) or (c) apply.
(4) In relation to the assessment date which falls on 30th April 2018, C is 0.10 if—
(a) the first test is met; and
(b) the second or third test is met.
(5) In relation to any subsequent assessment date—
(a) C is 0.10 if—
(i) the first test is met; and
(ii) the second test is met, whether or not the fourth test is met;
(b) C is 0.10 if in relation to the assessment date—
(i) the first test is met; and
(ii) the third test is met but the fourth test is not met; and
(c) C is 0.20 if in relation to the assessment date—
(i) the first test is met;
(ii) the third test is met; and
(iii) the fourth test is met.
Table 1
Total expenditure
Assessment date
Total expenditure anticipated for subsequent year (£million)
30th April 2018
760.32
31st July 2018
782.43
31st October 2018
809.90
31st January 2019
837.75
30th April 2019
866.53
31st July 2019
894.04
31st October 2019
920.70
31st January 2020
946.55
30th April 2020
967.99
31st July 2020
983.66
31st October 2020
997.53
Any date after 30th January 2021
1,009.26
Table 2
Forecast for expenditure: plants which generate heat from solid biomass
Assessment date
Expenditure threshold when calculating C for the purposes of regulation 60 (£million)
Anticipated increase in expenditure since previous assessment date (£million)
30th April 2018
404.34
3.33
31st July 2018
407.67
3.33
31st October 2018
411.00
3.33
31st January 2019
414.34
3.33
30th April 2019
417.67
3.33
31st July 2019
421.00
3.33
31st October 2019
424.33
3.33
31st January 2020
427.67
3.33
30th April 2020
431.00
3.33
31st July 2020
434.33
3.33
31st October 2020
437.66
3.33
Any date after 30th January 2021
441.00
3.33
Table 3
Forecast for expenditure: CHP systems
Assessment date
Expenditure threshold when calculating C for the purposes of regulation 60 (£million)
Anticipated increase in expenditure since previous assessment date (£million)
30th April 2018
87.39
0.72
31st July 2018
88.10
0.72
31st October 2018
88.82
0.72
31st January 2019
89.54
0.72
30th April 2019
90.26
0.72
31st July 2019
90.98
0.72
31st October 2019
91.69
0.72
31st January 2020
92.41
0.72
30th April 2020
93.13
0.72
31st July 2020
93.85
0.72
31st October 2020
94.57
0.72
Any date after 30th January 2021
95.29
0.72
Table 4
Forecast for expenditure: ground source heat pumps and shared ground loop systems with an installation capacity of 100kWth or above
Assessment date
Expenditure threshold when calculating C for the purposes of regulation 60 (£million)
Anticipated increase in expenditure since previous assessment date (£million)
30th April 2018
17.67
0.15
31st July 2018
17.82
0.15
31st October 2018
17.96
0.15
31st January 2019
18.11
0.15
30th April 2019
18.25
0.15
31st July 2019
18.40
0.15
31st October 2019
18.54
0.15
31st January 2020
18.69
0.15
30th April 2020
18.83
0.15
31st July 2020
18.98
0.15
31st October 2020
19.12
0.15
Any date after 30th January 2021
19.27
0.15
Table 5
Forecast for expenditure: ground source heat pumps and shared ground loop systems with an installation capacity of below 100kWth and air source heat pumps
Assessment date
Expenditure threshold when calculating C for the purposes of regulation 60 (£million)
Anticipated increase in expenditure since previous assessment date (£million)
30th April 2018
6.25
0.53
31st July 2018
6.78
0.53
31st October 2018
7.34
0.56
31st January 2019
7.94
0.60
30th April 2019
8.58
0.65
31st July 2019
9.22
0.64
31st October 2019
9.86
0.64
31st January 2020
10.53
0.66
30th April 2020
11.23
0.70
31st July 2020
11.94
0.71
31st October 2020
12.65
0.71
Any date after 30th January 2021
13.37
0.72
Table 6
Forecast for expenditure: plants which use solar collectors
Assessment date
Expenditure threshold when calculating C for the purposes of regulation 60 (£million)
Anticipated increase in expenditure since previous assessment date (£million)
30th April 2018
1.30
0.10
31st July 2018
1.40
0.10
31st October 2018
1.49
0.10
31st January 2019
1.59
0.10
30th April 2019
1.68
0.10
31st July 2019
1.78
0.09
31st October 2019
1.87
0.09
31st January 2020
1.97
0.09
30th April 2020
2.06
0.09
31st July 2020
2.16
0.09
31st October 2020
2.25
0.09
Any date after 30th January 2021
2.35
0.09
Table 7
Forecast for expenditure: plants which generate heat from biogas with a capacity below 600kWth
Assessment date
Expenditure threshold when calculating C for the purposes of regulation 60 (£million)
Anticipated increase in expenditure since previous assessment date (£million)
30th April 2018
55.75
0.99
31st July 2018
56.73
0.99
31st October 2018
57.73
0.99
31st January 2019
58.73
1.00
30th April 2019
59.74
1.01
31st July 2019
60.62
0.88
31st October 2019
61.51
0.89
31st January 2020
62.40
0.89
30th April 2020
63.29
0.90
31st July 2020
64.19
0.89
31st October 2020
65.09
0.90
Any date after 30th January 2021
66.00
0.91
Table 8
Forecast for expenditure: producers of biomethane for injection and plants which generate heat from biogas with a capacity of 600kWth and above;
Assessment date
Expenditure threshold when calculating C for the purposes of regulation 60 (£million)
Anticipated increase in expenditure since previous assessment date (£million)
30th April 2018
388.86
3.20
31st July 2018
392.06
3.20
31st October 2018
395.25
3.20
31st January 2019
398.45
3.20
30th April 2019
401.64
3.20
31st July 2019
404.84
3.20
31st October 2019
408.04
3.20
31st January 2020
411.23
3.20
30th April 2020
414.43
3.20
31st July 2020
417.62
3.20
31st October 2020
420.82
3.20
Any date after 30th January 2021
424.02
3.20
Table 9
Forecast for expenditure: deep geothermal plants
Assessment date
Expenditure threshold when calculating C for the purposes of regulation 60 (£million)
Anticipated increase in expenditure since previous assessment date (£million)
30th April 2018
3.17
0.03
31st July 2018
3.20
0.03
31st October 2018
3.23
0.03
31st January 2019
3.25
0.03
30th April 2019
3.28
0.03
31st July 2019
3.30
0.03
31st October 2019
3.33
0.03
31st January 2020
3.36
0.03
30th April 2020
3.38
0.03
31st July 2020
3.41
0.03
31st October 2020
3.43
0.03
Any date after 30th January 2021
3.46
0.03

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Source: https://www.legislation.gov.uk/ukdsi/2018/9780111166734/schedule/7/paragraph/2 (the official version)
Page: https://openlegislation.uk/draft-renewable-heat-incentive-scheme-regulations-2018/schedule-7/paragraph-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.