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Mr. Penhaligon
asked the Secretary of State for Energy what are the known reserves of coal in opencast sites in the United Kingdom.
Mr. Eadie
The distinction must be made between physical reserves and those which are economically workable at any particular time. Fully and partly proved reserves of coal currently economically
| Coal | Petroleum | Natural gas* | Nuclear electricity | Hydro electricity | Total | |||
| 1946 | … | … | 186·3 | 13·7 | — | — | 0·8 | 200·8 |
| 1947 | … | … | 184·5 | 18·0 | — | — | 0·7 | 203·2 |
| 1948 | … | … | 193·9 | 18·7 | — | — | 0·9 | 213·5 |
| 1949 | … | … | 195·8 | 19·9 | — | — | 0·8 | 216·5 |
| 1950 | … | … | 202·6 | 22·2 | — | — | 0·9 | 225·7 |
| 1951 | … | … | 207·8 | 24·8 | — | — | 1·0 | 233·6 |
| 1952 | … | … | 206·8 | 25·7 | — | — | 1·0 | 233·5 |
| 1953 | … | … | 207·8 | 27·8 | — | — | 1·0 | 236·6 |
| 1954 | … | … | 213·8 | 30·9 | — | — | 1·3 | 246·0 |
| 1955 | … | … | 215·2 | 34·5 | — | — | 1·0 | 250·7 |
| 1956 | … | … | 217·5 | 37·5 | — | — | 1·3 | 256·3 |
| 1957 | … | … | 212·9 | 36·7 | — | 0·2 | 1·5 | 251·3 |
| 1958 | … | … | 202·4 | 47·2 | 0·1 | 0·1 | 1·5 | 251·3 |
| 1959 | … | … | 189·4 | 56·1 | 0·1 | 0·5 | 1·5 | 247·6 |
| 1960 | … | … | 196·7 | 65·5 | 0·1 | 0·9 | 1·7 | 264·9 |
| 1961 | … | … | 191·8 | 71·0 | 0·1 | 1·1 | 2·1 | 266·1 |
| 1962 | … | … | 191·2 | 78·6 | 0·1 | 1·5 | 2·1 | 273·5 |
| 1963 | … | … | 194·0 | 85·3 | 0·2 | 2·5 | 1·8 | 283·8 |
| 1964 | … | … | 187·2 | 93·3 | 0·3 | 3·2 | 1·9 | 285·9 |
| 1965 | … | … | 184·6 | 102·8 | 1·2 | 6·0 | 2·3 | 296·9 |
| 1966 | … | … | 174·7 | 111·7 | 1·1 | 7·8 | 2·4 | 297·7 |
| 1967 | … | … | 163·8 | 119·3 | 1·9 | 8·9 | 2·7 | 296·6 |
| 1968 | … | … | 164·5 | 125·9 | 4·3 | 10·1 | 2·2 | 307·0 |
| 1969 | … | … | 161·1 | 135·7 | 8·4 | 10·5 | 2·0 | 317·7 |
| 1970 | … | … | 154·4 | 145·6 | 16·0 | 9·4 | 2·6 | 328·0 |
| 1971 | … | … | 138·7 | 147·3 | 25·8 | 9·7 | 1·8 | 323·3 |
| 1972 | … | … | 120·9 | 157·6 | 36·7 | 10·5 | 2·0 | 327·7 |
| 1973 | … | … | 131·3 | 159·4 | 39·7 | 9·9 | 2·0 | 342·3 |
| 1974 (January to October) | … | … | 92·2 | 119·5 | 37·5 | 9·7 | 1·6 | 26·05 |
| * Including colliery methane. | ||||||||