asked the Secretary of State for Energy what are the final figures for 1976 for total primary energy input, broken down into the standard categories; and what percentage of the total each category represented.

The latest available figures for primary energy input in 1976 in million therms, and the percentage share of the total represented by each primary fuel, are as follows:

	Million therms	Percentage share
Coal	29,762	36·5
Petroleum	33,744	41·4
Natural gas	14,684	18·0
Primary electricity	3,398	4·2
	81,588	100·0

In compiling these figures, separate grades of coal and types of petroleum product are converted to thermal equivalents by the calorific factors appropriate to each.