Rural Energy Investment Act of 2013

Rural Energy Investment Act of 2013 - Amends the Farm Security and Rural Investment Act of 2002 regarding the biobased markets program to: (1) extend program funding through FY2018, (2) increase the number of categories of biobased products designated and individual biobased products eligible for preferred purchasing, and (3) provide for a program of biobased product education and promotion activities.

Amends the Rural Energy for America Program to: (1) extend Program funding through FY2018; (2) make nonprofit organizations eligible for assistance; (3) provide loan guarantees and grants to agricultural producers and rural small businesses for renewable energy system purchases, with a tiered loan and grant application process that reflects project cost; and (4) permit the combined amount of a grant and a loan guarantee to cover all eligible activity costs.

Extends funding through FY2018 for: (1) biorefinery assistance, (2) the biodiesel fuel education program, (3) biomass research and development, (4) the Rural Energy Self-Sufficiency Initiative, (5) the biomass crop assistance program, (6) the forest biomass for energy program, (7) the community wood energy program, and (8) the feedstock flexibility program for bioenergy producers.