The National Party's housing and infrastructure spokesperson says the biggest barrier to renewable energy is the planning system.
National's new renewable energy policy plans to double the amount of electricity produced by solar, wind and geothermal sources by removing red tape.
Chris Bishop says electricity companies want to invest, but they're being held up by the lengthy planning and consent process.
Bishop told Morning Report in some cases it takes ten years to build a wind farm - two years to construct it, and eight years to get consent.
