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55.—(1) This article applies for the purpose of calculating the full project score to be given to an ECO4 project that meets the requirements of article 49.
(2) The full project score is the result of the following formula—
KP x (1+ F) x (C + OGR) + BH + ESH + IMP + BFR – L.
(3) In paragraph (2)—
“KP” is the determined cost savings for the ECO4 project;
“F” is—
0.2, where the floor area of the domestic premises is less than 73m2;
0.1, where the floor area of the premises is between 73m2 and 97m2 (both inclusive);
0, where the floor area of the premises is greater than 97m2;
“C” is—
1.1, where at least one qualifying action in the ECO4 project meets the condition in article 21 (measures accompanied by a declaration from a relevant authority or participant and Secretary of State approval);
otherwise, 1;
“OGR” is—
0.35, where the domestic premises are—
off-gas premises; and
in a rural area in Scotland or Wales;
otherwise, 0;
“BH” is the amount determined in accordance with article 56 (addition to annual cost savings for projects including basic heating repair or replacement measures);
“ESH” is the amount determined in accordance with article 57 (addition to annual cost savings for projects including repairs and replacements of efficient electric storage heaters);
“IMP” is the “project innovation uplift” and is the amount determined in accordance with article 58 (addition to annual cost savings for projects that include certain innovation measures);
“BFR” is the “building fabric repair increase” and is the amount determined in accordance with article 61 (addition to annual cost savings for certain projects incurring building fabric repair expenditure);
“L” is—