The extension of the renewable energy production tax credit (PTC) to geothermal energy in the Energy Policy Act of 2005 has been a principal factor in the growth of geothermal energy, according to a statement submitted to the Select Revenue Measures and Oversight subcommittees by the Geothermal Energy Association (GEA). But, many geothermal projects will not be completed by the current tax credit expiration deadline, which will undermine future industry growth according to the GEA.