"expansion of capacity" is a correct and usable phrase in written English.
You can use it when you need to express the idea of increasing the ability, or size, of a particular resource or capability. For example, "The company has announced an expansion of capacity in their production facilities."
And cheaper prices have led to a major expansion of capacity in the United States.
Nick Clegg tried but failed at the last Lib Dem conference to get his party to recognise the need for expansion of capacity in the south east.
As the multinationals rushed in and productivity quickly improved, the immediate result was a dramatic expansion of capacity, and margins deteriorated.
This expansion of capacity plus the greatly enlarged output of the Swiss producers (Ciba, Geigy, and Sandoz) permitted Britain to obtain essential dyes at high cost.
In the short term the answer is yes, especially because governments are throwing money at vaccine-makers to stimulate an expansion of capacity.
In a report, the Competition Commission said BAA's dominance of the airport markets in southeast England and central Scotland limited choices for passengers and airlines and curbed the expansion of capacity.
At the height of the boom in LED manufacturing, Chinese local governments would pay for 100% of the cost of the metal organic chemical vapor deposition (MOCVD) tool used to make LEDs, so naturally what followed was a dramatic over-expansion of capacity and commoditization of the output.
The letter alarmed Mr. Rosenthal; his concern was redoubled by the commission's No. 1 recommendation: "The overall capacity of the Department of Correction should be increased through an expansion of secure capacity at existing facilities," the report said.
In order to increase vaccine availability, an expansion of manufacturing capacity and/or further reductions in vaccine antigen content may be required.
The number with an annual handling capacity of over 30m passengers will grow from three to 13.There will also be a huge expansion of seaport capacity.
