"To guarantee 100 percent emissions reductions from renewable energy, power consumption needs to be matched with renewable generation on an hourly basis," said Sally Benson, co-author of the paper and co-director of the Precourt Institute for Energy.
"Just purchasing more solar energy in a grid that already has lots of solar generation will not result in zero emissions," Benson, professor in the Energy Resources Engineering Department in the School of Earth, Energy & Environmental Sciences, also said.
The use of annual averages of the carbon content of grid power is valid only when fluctuations in renewable generation are small, or when all excess renewables can be stored.
"Both the carbon footprint of a large consumer and the environmental value of renewable energy assets depend on the grid they interact with," said energy resources engineering PhD student Jacques de Chalendar, lead author of the study.
Using annual accounting, a 100 percent solar strategy in 2025 would reduce carbon emissions by 119 percent of the hypothetical company's carbon footprint.
"In California, gas is often the marginal generation source and has a higher emissions rate than average grid power, which is why purchasing renewables can result in a net negative carbon footprint," said de Chalendar.
"A consumer with a 100 percent renewable energy supply can actually reduce the carbon footprint of the grid in addition to their own carbon footprint."
https://wattsupwiththat.com/2019/06/09/study-100-renewables-doesnt-equal-zero-carbon-energy/
"Just purchasing more solar energy in a grid that already has lots of solar generation will not result in zero emissions," Benson, professor in the Energy Resources Engineering Department in the School of Earth, Energy & Environmental Sciences, also said.
The use of annual averages of the carbon content of grid power is valid only when fluctuations in renewable generation are small, or when all excess renewables can be stored.
"Both the carbon footprint of a large consumer and the environmental value of renewable energy assets depend on the grid they interact with," said energy resources engineering PhD student Jacques de Chalendar, lead author of the study.
Using annual accounting, a 100 percent solar strategy in 2025 would reduce carbon emissions by 119 percent of the hypothetical company's carbon footprint.
"In California, gas is often the marginal generation source and has a higher emissions rate than average grid power, which is why purchasing renewables can result in a net negative carbon footprint," said de Chalendar.
"A consumer with a 100 percent renewable energy supply can actually reduce the carbon footprint of the grid in addition to their own carbon footprint."
https://wattsupwiththat.com/2019/06/09/study-100-renewables-doesnt-equal-zero-carbon-energy/
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