| KWH | Measure of "atomic" energy found inside 17-Across, 34-Across, and 56-Across |
| AREA | Authority on atomic energy found round far edge of Outer Space |
| BYEBYEBYE | 2000 NSYNC hit whose title suggests a farewell, and a hint to the starts of 17-Across, 34-Across and 42-Across |
| WAITINGFORGODOT | 1952 tragicomedy featuring the tramps 19 Across and 56 Across |
| IDONT | See 37-Across and 56-Across |
| DORR | 1841 rebellion leader ... also what can fill the square at the crossing of 56-Across and 56-Down |
| NUCLEAR | Deriving destructive energy from the release of atomic energy (7) |
| THORIUM | Metal important as a potential source of atomic energy (7) |
| REACTOR | Possible creator of atomic energy |
| SALADDRESSING | The first words of 24-Across, 34-Across and 47-Across are types of this |
| FUEL | Source of energy - energy found in flu treatment (4) |
| PIPESOFPEACE | Energy found in seeds from fruit detailed on European symbols of harmony and friendship (5,2,5) |
| TRAFFICLIGHTS | Signals using parts of 20 Across, 34 Across and 42 Across (13) |
| REX | Name that's fit for a king, and also "fits" inside 17-, 26-, |
| ERG | Unit of energy found in 10 long puzzle answers |
| TOPSECRET | Classified source of energy found in new crop test (3,6) |
| NEW | Original source of energy found in the north west (3) |
| GLORIES | One source of energy found in commodities (7) |
| FAECES | Energy found in aspects of waste products (6) |
| GEEGEE | Surprise backing, for example, for energy found on the track (3-3) |
