The phrase "substantial proportion" means a significant or large part or amount of something.
Sentences with «substantial proportion»
Rather, your metabolism simply determines the most substantial proportion of your daily caloric requirements. (shapesense.com)
If Australia is to replace substantial proportions of its fossil - fuelled power stations with renewables we must greatly increase our amount of energy storage; pumped hydro will have to provide a large part of this. (ramblingsdc.net)
The first graph, renewables share, shows that SA, which had practically no renewable energy 14 years earlier, had a very substantial proportion in September 2017. (ramblingsdc.net)