The 3 biggest obstacles to a solar energy boom

The cost of solar energy is plummeting. But it's still way more expensive than coal and natural gas

A worker installs solar panels containing photovoltaic cells at the new Solarpark Eggersdorf solar park near Muencheberg, Germany.
(Image credit: Sean Gallup/Getty Images)

Optimism surrounding a solar energy boom seems to be hitting new highs: Game-changing technologies seem to hit the market nearly every week, and new government policies, like a series of solar mandates in Japan, has people and businesses all over the world installing solar panels at record rates.

Nonetheless, several challenges stand between us and a true solar revolution. Here are three:

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