How can I present-value and sell this revenue stream?

[Ken Sanders]

I'm about to enter into an investment deal with an energy company in which I will be entitled to a 15-year income stream. Pre-determined amounts will be paid to me in inequal yearly installments (e.g. year 5 pays $12k and year 11 pays $207k). The income stream is based on a contract that the energy company has with another company.

Is this something that can realistically be present-valued and sold off? How would I go about trying to sell this income stream?