Exactly my thoughts as well, John.

Anyway I think I have worked through it all and it seems basically what I said before.

The RHI payment calculation is based on the meter reading until such time, within a 12 month period, as that figure goes over the EPC deemed value when it is maxed at that figure.

The crux in the legislation is this part at 28(4):

Where in any quarterly period, R is a figure which is 0 or higher and the sum of that figure and AP is greater than MaxP, the RHI payment for the quarterly period is calculated in accordance with the following formula—

R = MaxP - AP

MaxP is the figure based on the deemed EPC and AP is the total payments in the current year to date.

For example:

EPC deemed figure is 16,000 kWh

q1 meter reading 8,000 kWh = RHI payment of tariff x 8000

q2 meter reading 6,000 kWh = RHI payment of tariff x 6000

q3 meter reading 4,000 kWh = RHI payment of tariff x 2000 (max of 16,000 now reached)

q4 meter reading 1,000 kWh = RHI payment of tariff x 0 (max of 16,000 already reached)