The phrase "a more efficient source" is correct and usable in written English.
You can use it when comparing the effectiveness or productivity of different sources of information, energy, or materials.
Example: "After conducting research, we found that solar panels are a more efficient source of energy compared to traditional fossil fuels."
Alternatives: "a better source of efficiency" or "a more productive source".
Burke and Hare soon found murder to be a more efficient source of bodies than death by natural causes.
With lower production costs and cheaper land prices in the tropical countries where it is grown, sugar cane is a more efficient source.
This is why remittances from Africans abroad, which have trebled in a decade to an estimated $60bn annually (just under double the donor flow), are a more efficient source of external financing than aid.
Results of this study showed that feeding steam-flaked broom sorghum compared with ground broom sorghum could supply a more efficient source of energy for lactating cows.
We conclude that immature tissue stem cells (PαS cells) are a more efficient source of iPS cells than partially committed ones (OP cells) or a mixed cell population (TTFs) of the same lineage.
However, direct ingestion of these acids (from fish, shellfish, and algae) seems to be a more efficient source.
Stem cells, as used for Beyene's windpipe transplant, provide an even more efficient source.
The two companies said they would initially invest $10 million each in a joint venture that would sell Japanese corporations electricity generated by fuel cells, a substantially cleaner and more efficient source of energy than coal or other fossil fuels.
EBay plans to use about six million watts of power generated on-site by fuel cells, which are a substantially cleaner and more efficient source of energy than coal, in its new data center in South Jordan, Utah.
EBay plans to use about six million watts of power generated on-site by fuel cells, which are a substantially cleaner and more efficient source of energy than coal, in the new data center in South Jordan, Utah.
The energy capital of the world, from that perspective, views oil as limited, and any alternative, renewable or more efficient source of energy is a resource to be invested in, particularly the kind of energy that shines upon us every day.
