Energy Exchange

A Green Roof And Greenhouse: Signs Of An Ambitious Green Campus

By: Carrie Gonnella, 2011 Climate Corps Public Sector Fellow at Catawba College in Salisbury, NC; MEM/MBA candidate at the Nicholas School of the Environment/Fuqua School of Business, Duke University

This summer I am lucky to have a fellowship at Catawba College‘s Center for the Environment. I was fortunate to start just in time to learn about two initiatives the Center is pursuing: a green roof for the science building and a new high efficiency greenhouse.

I learned all about green roofs from Chuck Friedrich of Stalite Co. Stalite makes a green roof growing medium that is durable, lightweight, and easy to apply. There are many important steps involved in creating a luscious, healthy, and sustainable living roof, and Chuck gave us many things to consider, including:

  • There are two green roof options: extensive or intensive. An extensive roof has 2-4 inches of growing material, supporting sedum and other low-lying foliage. Intensive is 6 inches or more, and can support a greater range of plants, including trees.
  • Why remain flat? Subtle rolling hills can be created on green roofs based on the location of roof ballasts. They can support a thicker growing medium.
  • A green roof can extend the life of your roof by threefold!

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Posted in EDF Climate Corps / Tagged | Read 4 Responses

The Bottom Line: Information Is Powerful & Can Be Used For Good

By: Matt Davis, EDF Research Fellow and Author of EDF Behavior and Energy Savings Study

I’m excited to announce the results of a new EDF study that analyzes the potential to reduce energy use and our environmental impact using one of the cheapest inputs in the world: information.  At EDF, we’ve always believed that the right set of consumer-facing energy efficiency tools and technology could allow families to take charge of their energy usage, cut down on their monthly bills, and shrink their carbon footprint – and now we have proof.

Source: Opower

We collaborated with an innovative start-up called Opower to look at the potential for simple graphs and data to drive energy savings.  We analyzed 22 million electricity bills, spread across 11 utilities, to see how households react to energy-savings tips and – most importantly, and originally – a graphic that shows them how their usage stacks up against their neighbors’.

Our findings, in a nutshell: information pays.  The 771,000 households who received Home Energy Reports (Reports) reduced their electricity usage by 1.8% on average.  While we can only speculate about what would happen in other settings, that number jumped out at us, and for good reason.  If every home in America reduced their electricity usage by that much, we would all see the following benefits:

  •  $3 billion in savings on energy bills;
  • 26,000 gigawatt-hours of reduced electricity-demand – enough to power the homes of 5.6 million Americans; and
  • 8.9 million metric tons of reduced carbon emissions, which is equivalent to the annual emissions from three 500 MW coal-fired power plants.

We also looked at how different types of households respond to the Reports and found some interesting results.  For instance, in most of the utilities we looked at, the “energy hogs” are the most likely to roll back their energy usage.  If you were to use that fact to target reports at “high-potential” households, you could boost the average reduction to 6.8% – more than three times the sample-wide average.

Energy efficiency is widely considered one of the greatest untapped energy resources.  This study confirms that simple behavioral changes generate consistent savings across a wide range of utilities and demographics.  The message is clear: customers empowered with information on energy usage are more likely to save energy and money, all while reducing their carbon footprint.

We hope that simple, innovative tools like this one will spread far and wide.

Posted in Energy Efficiency / Read 3 Responses

Pay low costs for greenhouse gasses today or pay in human lives later

The United States Military is perhaps the most advanced scientific entity in the world, and can tout advances such as the internet, “smart” armor using nanotechnology and sophisticated “war game” computer simulations to develop strategic plans. 

The military has used scientific theories throughout history to ensure a strong sense of national security in a world filled with international upheaval.  They have used the theory of gravity to develop bullet trajectories and the science of aeronautics to land a man on the Moon.  So it should be some comfort to Texans that our Senators have historically deferred to the military on such issues as the preeminent experts in keeping our nation and resources secure.

All the more reason that it seems strange that Texas’ Senators Hutchison and Cornyn are trying to play political football with an issue that both our public and our nation’s best military minds see as a grave threat to our national security. 

We now know that the climate change and the national security threats arising from it have been a focus of National Defense University and military intelligence analysts for years.  They find that the costs of inaction will be serious, and not just in terms of direct impacts to our farmland and coastline.  Read More »

Posted in Climate, Texas / Read 28 Responses

New electricity rate will make truck and bus charging cheaper, cleaner in California

State regulators just approved a first-of-its-kind charging rate for electric trucks and buses in northern California that will make it more affordable for fleet operators to make the switch from diesel to electric.

This new “dynamic” rate changes on an hourly basis, offering more opportunities for fleet operators to charge their vehicles when electricity is cheap (for example, when the grid is underutilized or when clean electricity is plentiful). In 2019, state regulators authorized Pacific Gas and Electric Company to offer a commercial electric vehicle time of use rate; regulators also directed the utility to request a more dynamic rate option, which is what was just approved. PG&E offering a menu of options tracks with EDF’s recent recommendation that multiple options — to accommodate many different operational use cases — are needed to make commercial vehicle electrification as affordable and clean as possible.

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Posted in Air Quality, California, Electric Vehicles / Comments are closed

Federal regulators should reevaluate the incentive model for gas pipelines

The energy industry is in the midst of a massive transformation. Natural gas fired power plants are now the dominant source of electric power in the U.S., and according to numerous studies, natural gas will continue to have a role in our future energy system — even in stringent greenhouse gas reduction scenarios. For the first time ever, renewables supplied more generation than coal in April. New technologies, evolving customer expectations and state laws directing greenhouse gas reductions are driving significant changes in the way we use and consume energy. The pace of this change will be even further accelerated as we turn to electrification as a means of decarbonization.

Regulators must reevaluate their policies and rules to ensure they are keeping up with these major changes. This is particularly true for the current revenue model of gas pipelines, which is built on the idea that “the more you spend, the more you earn.”

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Posted in Clean Energy, Gas to Clean, Natural Gas / Comments are closed

The Revolution will be Solarized

construction-646465_640There’s a clean energy revolution happening in California – and it has the potential to topple the old polluting forces while fighting climate change with the power of the sun.

California is not only producing the most solar power in the country – 8.5 gigawatts, enough to power two million homes – it’s producing more solar power than the rest of the country combined. In 2014 alone, the state more than doubled its solar power, becoming the first state to generate five percent of its total electricity from utility-scale solar. This record does not even count rooftop solar and distributed generation (where California also leads the country), bringing the state closer to an estimated seven percent of its total power generation from free sunshine.

The solar industry employs more than 54,000 Californians – nearly one-third of all solar workers in the nation – and solar jobs in the state grew by 16 percent in 2014 alone (compared to 2.2 percent overall state job growth in 2014). California solar jobs are expected to grow by another 17 percent in 2015.

California cities are the vanguard of this revolution, with Los Angeles, San Diego, San Jose, San Francisco, and Sacramento leading the charge. New research finds that California’s cities and urban centers could generate enough solar to meet the state’s power needs three to five times over, without developing a single additional acre of the state’s natural areas. Read More »

Posted in California, Clean Energy, Energy Equity, Renewable Energy / Read 6 Responses