The government has recently introduced a subsidy for renewable energy that pays individual producers 24p per energy unit on top of all the money they save on their own fuel bill, and on selling surplus electricity back to the grid at approximately 5p per unit.
Could you please explain the underlined part in a way that is clear to me?
24p is a short way of saying 24 pence.
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jaleh24p per energy unit on top of all the money they save
In addition to all the money they save by producing electricity, they generally receive 24 pence for every unit of energy they produce.