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What does, then?

Isn't the "value" of an industry normally taken to be the sum of the market caps of all the companies in the industry?

Much of the time it will refer to revenue generated on an annual basis.

For example, all wind energy companies might spend $1T this year as an investment, but only bring in $10B in revenue. That would be a $10B market.

But manufacturing and installing wind turbines would be $1T/year revenue, since that's where their investment goes.

$1T in manufacturing not in power generation which is the more important and relevant part of the equation.

That would be $1T in cumulative revenue, not $1T/year of revenue.

It is a large number. But it's a different large number from the headline.