Category Archives: Energy Efficiency

Splitting the Emissions Baby: Allocating GHG Reductions in the Electricity Sector Part II

In my last post, I discussed the dilemma of how to allocate the avoided greenhouse gas (GHG) emission between policies that policies to increase renewable electricity and reduce electricity consumption. Estimating the effects of increased renewable first will artificially increase … Continue reading

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What is Business-As-Usual? Projecting Greenhouse Gas Emissions at the Regional Level

Projecting greenhouse gas (GHG) emissions is important because it helps us to assess how much the energy and GHG policies in place help to achieve targets set by law. For example, if we apply California’s AB32 target to the San … Continue reading

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Water-Energy Nexus: City of San Diego

This is the second in a two-part series on the water-energy nexus and this post focuses on the City of San Diego. The previous post, discussed the energy and greenhouse gases associated with moving water in the state of California. Generally, … Continue reading

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The Water-Energy Nexus in California

The water-energy nexus has been in the news since the California Energy Commission’s landmark finding in 2005, that water related energy uses account for about 19% of all electricity use and 30% of non-power plant natural gas use in the … Continue reading

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How many pounds of carbon dioxide (CO2) does a gallon of gas produce?

Before answering this question it helps to first know how much a gallon of gasoline weighs. Gasoline has a weight of just over 6 pounds per US gallon. A natural guess could then be that about 6 pounds of carbon dioxide (CO2) … Continue reading

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The MPG Illusion

Assume that you have two cars; an SUV and a compact car. Both cars are aging but you can only afford to replace one. Assume further, that like many families, you still require at least one car with a carrying … Continue reading

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New CAFE standards: 54.5 MPG in 2025

The Obama Administration recently approved new Corporate Average Fuel Economy (CAFE) standards for 2017 – 2025. The new standards are an extension of the 2012 – 2016 CAFE standards. The announcement of 54.5 MPG by 2025 certainly raised some eyebrows. Let’s take a look at what the new … Continue reading

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Load Factor

Load factor is the ratio of average demand to peak demand, typically measured in megawatts (MW) on a system wide level. It is a useful metric to show how much of the entire electric delivery system capacity is being used … Continue reading

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Energy Consumption by Sector in the United States

The primary source of energy in the United States has only changed three times in the nation’s history. The U.S. relied largely on wood for cooking and heating until nearly the turn of the twentieth century when coal became the primary energy source … Continue reading

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