... regions of the state On the other hand, only a small fraction of those claiming the tax credit take advantage of the low-interest loan Furthermore, the property-tax exemption complements the ... National Laboratory, Matthew Brown of the National Conference of State Legislatures, Jane Weissman of the Interstate Renewable Energy Council, Frederick Beck of the Renewable Energy Policy Project, ... given the purpose and scope of this project—and the variety of factors influencing decisions toward the purchase of renewable energy systems—we use the term effectiveness in the context of the...