That can be renewed: a renewable membership; renewable subscriptions.
Relating to or being a commodity or resource, such as solar energy or firewood, that is inexhaustible or replaceable by new growth.
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.