| Industry | SIC Code | Members | % |
| Manufacture of coke oven products | 33100 | 14 | 0.62 |
| Petroleum refineries/synthesisers | 33200 | 315 | 13.94 |
| Processing of nuclear fuel | 33300 | 31 | 1.37 |
| Manufacture of basic chemicals, except fertilizers and nitrogen compounds | 33410 | 625 | 27.65 |
| Manufacture of plastics in primary form and of synthetic rubber | 33430 | 297 | 13.14 |
| Manufacture of industrial gases in compressed, liquefied or solid forms | 41210 | 168 | 7.43 |
| Wholesale trade in solid, liquid and gaseous fuels and related products | 61410 | 706 | 31.24 |
| Industrial research, e.g. fuel research | 87140 | 104 | 4.6 |