Hell or high water contract

A contract that obligates a purchaser of a project's output to make cash payments to the project in all events, even if no product is offered for sale. It is a non-cancellable contract whereby the purchaser must make the specified payments to the seller, regardless of any difficulties they may encounter. 

It is a contract including a clause stating that payments must be made regardless of what happens. Specifically, a hell or high water contract requires one party to continue to receive payments even if an act of God prevents the contract from being completed. For example, suppose two parties sign a contract renting an apartment. The contract may contain a hell or high water clause saying that the renter must pay rent every month even if the apartment floods or burns down. It is also called a promise to pay contract.