"substantial supply" is correct and usable in written English.
You can use it to indicate a large amount of something. For example, "The company had a substantial supply of raw materials to work with."
It is, along with almost everything else of recent vintage in an art world where frenetic production has outrun any substantial supply line of ideas.
The marinated steak sandwich comes not on a burger bun, but on acrunchy hero roll, one that boasts a substantial supply of flavorful though chewy meat, melted Swiss cheese, mushrooms and sauteed onions (think Philadelphia cheese steak sandwich).
But the government charges that Sarao tried "to manipulate the market for E-Minis by placing multiple large-volume sell orders on the CME (to create the appearance of substantial supply and thus drive prices down) and modifying and ultimately canceling the orders before they were executed.
This significant and rapid growth of immigrants constitutes a substantial (supply) shock, which is expected to affect both employment and earnings differentials of immigrants relative to natives.
This article shows that open architecture may provide substantial supply chain cost reduction, and simplification of the distribution network when combined with proper inventory storage policies.
"But entrepreneurial folks did see elements of something special: a fast-growing economy; a substantial supply of low-cost, high-tech talent; and a broad & experienced Vietnamese diaspora increasingly interested to reconnect with and contribute to the country.
The substantial supply-chain disruptions associated with last year's seismic and nuclear disasters were obviously a big part of that.
In North America, especially the Gulf of Mexico and Canada, there are also substantial supplies of natural gas.
The UK is well prepared – we have substantial supplies of antiviral drugs and agreements for enough vaccine for the entire population.
At a Lowe's home improvement store in Torrington, Conn., people packed the aisles, loading their carts with batteries, flashlights and more substantial supplies.
Moreover, it is easier to stay low-energy than to get there; everything in developed countries, from houses to health care to the supply chain that brings food to market, is designed to run on substantial supplies of fossil fuel.
