The claim that Las Vegas spent $5 billion on mirrors that collect sunlight and only generate $30 million per year is misleading and lacks credible evidence.
Las Vegas spent $5 billion on mirrors that collect sunlight and only make $30 million per year.

Trump tax records expose more than $21 million in highly unusual payments from the Las Vegas hotel he owns, an engineered windfall in 2016 as campaign funds dwindled – Chicago Tribune
Source: chicagotribune.com
Key Evidence
No credible source confirms a $5 billion investment by Las Vegas in mirror-based solar power.
Social media posts repeating the claim lack verifiable data or official references.
Authoritative sources on solar energy and Las Vegas investments do not corroborate these numbers.
What the Evidence Shows
The claim appears to refer to a large-scale solar power project involving mirrors, likely a concentrated solar power (CSP) facility, but there is no verified public record or credible source confirming that Las Vegas specifically spent $5 billion on such a project.
Concentrated solar power technology uses mirrors to focus sunlight to generate electricity, and while initial investments can be high, the revenue and cost-effectiveness depend on many factors including scale, technology, and operational efficiency.
The cited social media posts do not provide verifiable data or official sources to substantiate the $5 billion expenditure or the $30 million annual revenue figure.twitter.comtwitter.comLas Vegas spent $5 billion on mirrors that collect sunlight
x.comx.comLas Vegas spend $5 billion on mirrors that collect sunlight+1 more
Other sources related to Las Vegas or solar energy ( through ) do not mention such an investment or financial outcome, indicating this claim is not supported by mainstream or authoritative information.dw.comdw.comSaving the sun's energy and storing it
forbes.comforbes.comMagician David Copperfield's $800 Million Fortune Could Make Him A Future...
It is possible the claim conflates or exaggerates figures related to solar projects or other investments in the region, but without credible evidence, it should be treated as misleading.
In summary, while solar mirror technology exists and is used in some regions, the specific financial figures and attribution to Las Vegas in this claim are unsubstantiated.