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The power grid will need to be dramatically upgraded and expanded in the coming years to handle the transition to renewable energy - and two new reports look at the impact on wildlife, both on and off-shore.

The placement of large onshore power grids can greatly affect migratory species such as mule deer, elk, and sage grouse.

Veronica Ung-Kono is a clean-energy policy transmission specialist and staff attorney with the National Wildlife Federation.

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"Proactively planning transmission development helps to strike a balance," said Ung-Kono, "that can help wildlife have their needs met while also helping people have access to low-cost and clean energy."

Ung-Kono said more research is needed because there's still a lot we don't know about the implications for wildlife as more transmission lines crisscross the landscape.

A second report on offshore wind farms recommends buffer zones around sensitive coral habitat.

It also says cables for windmills fixed to the ocean floor must be shielded and buried to reduce impacts from electromagnetic fields.

Co-author Shayna Steingard - an offshore wind senior policy specialist with the National Wildlife Federation - said if it's done right, the clean-energy transition will preserve habitat, and slow ocean warming and sea-level rise linked to climate change.

"I think climate change presents an existential threat to all species, particularly ocean species," said Steingard. "The threats from offshore wind development pale in comparison to the threat from not addressing climate change. There is no climate solution without offshore wind."

President-elect Donald Trump has vowed to kill offshore wind development. So far, site surveys have been approved for the five wind farms planned off the California coast, but they still face years of permitting and environmental review.