# The Renewable Heat Incentive Scheme Regulations 2017, Paragraph 2: Calculation of C


(1) For the purposes of regulation 60, C is calculated in relation to a tariff category as follows.
(2) For the purposes of this paragraph—
(a) the first test is met in relation to an assessment date if, as at that assessment date, the forecast for expenditure in relation to that tariff category exceeds the figure specified in relation to that date in the second column of the table in this Schedule which is applicable to that tariff category;
(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 in the third column of the table in this Schedule which is applicable to that tariff category (“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 2017, 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.
(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 2017, 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 2017
829.44
31st July 2017
838.47
31st October 2017
847.51
31st January 2018
856.54
30th April 2018
865.57
31st July 2018
876.02
31st October 2018
886.51
31st January 2019
897.04
30th April 2019
907.60
31st July 2019
918.18
31st October 2019
928.79
31st January 2020
939.44
30th April 2020
950.13
31st July 2020
962.51
31st October 2020
974.94
Any date after 30th January 2021
987.44
Expenditure in relation to tariff categories
Plants which generate heat from solid biomass and new solid biomass 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 2017
392.35
2.55
31st July 2017
394.90
2.55
31st October 2017
397.45
2.55
31st January 2018
400.00
2.55
30th April 2018
402.55
2.55
31st July 2018
405.97
3.42
31st October 2018
409.39
3.42
31st January 2019
412.82
3.42
30th April 2019
416.24
3.42
31st July 2019
419.57
3.33
31st October 2019
422.90
3.33
31st January 2020
426.23
3.33
30th April 2020
429.56
3.33
31st July 2020
432.99
3.44
31st October 2020
436.43
3.44
Any date after 30th January 2021
439.87
3.44
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 2017
16.95
0.11
31st July 2017
17.06
0.11
31st October 2017
17.17
0.11
31st January 2018
17.28
0.11
30th April 2018
17.39
0.11
31st July 2018
17.53
0.15
31st October 2018
17.68
0.15
31st January 2019
17.83
0.15
30th April 2019
17.98
0.15
31st July 2019
18.12
0.14
31st October 2019
18.27
0.14
31st January 2020
18.41
0.14
30th April 2020
18.55
0.14
31st July 2020
18.70
0.15
31st October 2020
18.85
0.15
Any date after 30th January 2021
19.00
0.15
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 2017
5.59
0.58
31st July 2017
6.17
0.58
31st October 2017
6.75
0.58
31st January 2018
7.33
0.59
30th April 2018
7.92
0.59
31st July 2018
8.53
0.60
31st October 2018
9.14
0.61
31st January 2019
9.76
0.62
30th April 2019
10.38
0.62
31st July 2019
11.01
0.63
31st October 2019
11.64
0.63
31st January 2020
12.28
0.64
30th April 2020
12.92
0.64
31st July 2020
13.58
0.66
31st October 2020
14.24
0.66
Any date after 30th January 2021
14.91
0.67
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 2017
0.31
0.02
31st July 2017
0.33
0.02
31st October 2017
0.35
0.02
31st January 2018
0.37
0.02
30th April 2018
0.39
0.02
31st July 2018
0.40
0.02
31st October 2018
0.42
0.02
31st January 2019
0.44
0.02
30th April 2019
0.46
0.02
31st July 2019
0.48
0.02
31st October 2019
0.51
0.02
31st January 2020
0.53
0.02
30th April 2020
0.55
0.02
31st July 2020
0.57
0.02
31st October 2020
0.59
0.02
Any date after 30th January 2021
0.61
0.02
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 2017
79.26
3.85
31st July 2017
83.10
3.85
31st October 2017
86.98
3.88
31st January 2018
90.90
3.91
30th April 2018
94.85
3.95
31st July 2018
98.94
4.09
31st October 2018
103.07
4.13
31st January 2019
107.23
4.17
30th April 2019
111.44
4.20
31st July 2019
115.67
4.23
31st October 2019
119.94
4.27
31st January 2020
124.24
4.30
30th April 2020
128.58
4.34
31st July 2020
133.08
4.50
31st October 2020
137.62
4.54
Any date after 30th January 2021
142.20
4.58
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 2017
371.79
2.42
31st July 2017
374.21
2.42
31st October 2017
376.63
2.42
31st January 2018
379.04
2.42
30th April 2018
381.46
2.42
31st July 2018
384.70
3.24
31st October 2018
387.94
3.24
31st January 2019
391.19
3.24
30th April 2019
394.43
3.24
31st July 2019
397.58
3.16
31st October 2019
400.74
3.16
31st January 2020
403.89
3.16
30th April 2020
407.05
3.16
31st July 2020
410.31
3.26
31st October 2020
413.56
3.26
Any date after 30th January 2021
416.82
3.26
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 2017
2.97
0.02
31st July 2017
2.99
0.02
31st October 2017
3.01
0.02
31st January 2018
3.03
0.02
30th April 2018
3.05
0.02
31st July 2018
3.07
0.03
31st October 2018
3.10
0.03
31st January 2019
3.12
0.03
30th April 2019
3.15
0.03
31st July 2019
3.18
0.03
31st October 2019
3.20
0.03
31st January 2020
3.23
0.03
30th April 2020
3.25
0.03
31st July 2020
3.28
0.03
31st October 2020
3.30
0.03
Any date after 30th January 2021
3.33
0.03

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Source: https://www.legislation.gov.uk/ukdsi/2017/9780111156476/schedule/7/paragraph/2 (the official version)
Page: https://openlegislation.uk/draft-renewable-heat-incentive-scheme-regulations-2017/schedule-7/paragraph-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.