Why New York City streets steam

What is the main cause of the steam seen rising from Manhattan's street manholes?

Would you live in a building heated entirely by underground city steam?

What is the approximate temperature of the steam traveling inside New York City's underground pipes?

Which season do you think benefits more from underground steam power?

How many major power plants generate the steam distributed throughout Manhattan's underground network?

Besides heating, what is a major summer use for New York City's underground steam?

Which utility company currently owns and operates the massive steam system under New York City?

Why is steam heating considered highly efficient for large skyscrapers compared to individual boilers?

What percentage of New York City's steam is produced through cogeneration, which makes electricity and steam together?

Approximately how many miles of steam pipes run beneath the streets of Manhattan?