The National Science Foundation funds super computer sites through a program called XSEDE (Extreme Science and Engineering Discovery Environment).  This is a single place where you can request computational hours on their various HPC resources.

Doug Swesty from Astronomy partnered with Research Technologies to ask for an abstract that could be used as example to request 200K hours of CPU time.   Thanks the generosity of Neelima Sehgal – we have enclosed an example of how to request hours on the XSEDE resources.

NCSA_NSF_Request  (The example request document)

Here is a link to the XSEDE systems: https://www.xsede.org/high-performance-computing