I had to look this up. Here's what I found

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Buildings are a significant source of climate pollution, often accounting for around 50 percent of a city’s greenhouse gas emissions. This pollution comes from burning fossil fuels on site primarily for space and water heating, and from generating electricity for lighting, air conditioning, appliances, or space and water heating.

We can eliminate emissions by electrifying heating and hot water with super-high efficiency heat pump technology and ensuring our electricity increasingly comes from renewable resources. However, to reach zero emissions in the most cost-effective and practical way, it’s crucial that we also lower energy demand (and thus, power generation) through such improvements as weatherization, high-efficiency appliances, and LED light bulbs. Lower demand also allows low-cost renewable energy to be used more widely, further cleaning the air and reducing energy bills.

https://www.nrdc.org/experts/merrian-bor...gs-accelerating

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BTW, "renewable sources of energy" are energy sources that are always being replenished. .. solar energy, wind energy, hydropower, geothermal energy, and biomass energy.

What could go wrong?