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Net-Zero Cities Aren’t Possible, You Say?

Some are already underway

Posted on Aug 25 2015 by Jonathan Rowe

From an environmental perspective, cities are already responsible for the majority of the planet’s energy consumption and greenhouse gas emissions. To meaningfully battle climate change and stay within our carbon budget, getting things right at the urban scale is critical.

Internet of Things (IoT) visionaries imagine a future where a “smart” electricity grid communicates bidirectionally with smart buildings wired with sophisticated sensing and controls technology. With this kind of setup, net-zero energyProducing as much energy on an annual basis as one consumes on site, usually with renewable energy sources such as photovoltaics or small-scale wind turbines. buildings — hyper-efficient structures that produce as much energy from renewable sources as they consume from the utility annually — could easily be the norm. But this is pretty far out on the horizon.

Creating a net-zero building today isn’t easy, especially on a tight budget. No surprise then that cities such as Masdar in Abu Dhabi have backpedaled on their lofty net-zero ambitions due to economic and technological constraints. If urban areas built from scratch on oil money can’t get to net zeroProducing as much energy on an annual basis as one consumes on site, usually with renewable energy sources such as photovoltaics or small-scale wind turbines. Calculating net-zero energy can be difficult, particularly in grid-tied renewable energy systems, because of transmission losses in power lines and other considerations., can existing communities and cities? And if so, what lessons from today’s net-zero craze can guide the future of energy-neutral cities?

Today's trend toward zero

From federal policy to state legislation to voluntary certifications and global calls-to-action, net-zero energy has become a rallying cry for how we might make a huge difference combating climate change by targeting buildings. Buildings are “hot spots” that account for about a third of the world’s greenhouse gases.

Technology advances are helping. More efficient heating, cooling, and lighting systems — coupled with better building envelopes and more powerful solar panels — make it possible to deliver a low- or zero-energy building with less effort than a decade ago. And designers are demonstrating that futuristic technology isn’t required to get there. Off-the-shelf systems work fine.

Consider the 222,000 square foot National Renewable Energy Laboratory (NREL) Research Support Facility (photo above). Sure, there are a few fancy features (ever hear of a thermal storage labyrinth?), but careful siting, orientation, and façade strategies that bring daylight into the workspaces did the heavy lifting for energy conservation. No rocket science here.

What is different is the radical approach to collaboration compared to traditional ways of building. Architects were once hailed as “master builders,” the central brains behind many timeless structures we still revere today. But in today’s world of hyper-green building design, there’s too much complexity for any one person — even an architect — to have the expertise to deliver a net-zero building solo.

Integrative design

For NREL, the architects transitioned to “masters of collaboration,” synthesizing and corralling information from a web of experts: engineers, builders, and various consultants. With that data, they could deliver on functional, programmatic, and performance goals by continuously assessing trade-offs throughout the design process. The building community calls this “integrative design” and recognizes it’s difficult given entrenched mindsets and traditions.

Virtual models are key for success in achieving net zero. Instead of 2D drawings, 3D models are serving more and more as a team’s single source of truth for design and construction. The advantages of designing, coordinating, optioning, and exploring in 3D are manifold.

Simulations of performance become critically important to get right for net-zero buildings. Given the inherent difficulties with predicting human behavior, how people end up using a space ends up having dramatic effects on the energy bill. Engineers for the David and Lucile Packard Foundation headquarters invested more time than usual to understand nuances of use over time from the owner. The extra effort paid off, and the headquarters is the largest certified net-zero energy building so far.

Beyond buildings: Scaling up net zero

On their own, individual net-zero buildings are commendable feats of design, engineering, construction, and operations. But to really make a difference combating climate change, they need to scale up fast. What do these building trends mean for cities? Can thinking bigger make net zero more cost-effective by leveraging resources among clusters of buildings and their shared infrastructure?

In a 2014 report, the New Buildings Institute tracked a growing pack of projects — with the majority of square footage in the education sector — reaching for net-zero energy. Most were individual buildings, but some were proving that campuses, neighborhoods, and even entire communities could capture efficiencies of scale that one-off buildings can’t.

The largest net-zero community in the U.S. is West Village, a mixed-use campus neighborhood at UC Davis, designed to house 3,500 students, staff, and families once complete. Phase One has been occupied for over a year and is close to meeting its net-zero design target. Technological glitches and higher-than-expected demand from apartment dwellers’ plugged-in gadgets held it back from claiming energy-neutral status.

UC Davis isn’t alone in making a strong environmental statement. With 673 signatories, the American College & University Presidents’ Climate Commitment underscores the magnitude of buy-in from the education sector for targeting carbon neutrality. Universities are essentially microcosms of cities — ideal testing grounds for showing how carbon neutrality can happen at a municipal scale — with net-zero building principles being a big part of the overall strategy.

Arizona State University partnered with Ameresco — the nation’s largest independent energy services solutions provider — and the Rocky Mountain Institute to plan for full-on campus-wide carbon neutrality by 2025. They plan to reduce energy demand using a holistic approach toward efficient buildings, low-carbon transportation, and increased renewable energy.

Looking beyond the campus

Exploring net zero extends beyond university campuses. FortZED is a zero-energy district combining the Colorado State University campus and part of downtown Fort Collins. It combines efficiency measures across a diverse mix of building types, and bringing online new renewable generation.

FortZED is a compelling example of partnering with a utility to test the feasibility of creating net-zero districts by orchestrating many small, distributed renewable generation systems — including wind, solar panels, and biomassOrganic waste that can be converted to usable forms of energy such as heat or electricity, or crops grown specifically for that purpose. — bidirectionally across the electricity grid. That’s impressive, considering our energy grid is designed for one-way delivery.

With more U.S. cities planning 2030 Districts, utilities have to get involved. The ultimate effect of net-zero energy districts affects their business models. In a district where everyone’s energy meter nets out to zero, who pays for the transmission and distribution systems that keep the lights on?

And to complicate things at the city scale, focusing on building energy use alone is just one piece of integrated planning that should address impacts from transportation emissions, water conveyance, and waste infrastructure. Net-zero cities will rely on a new breed of synthesist — systems thinkers adept in tackling large-scale technical, managerial, and societal challenges — to bring these visionary seeds to the cities most of us will, sooner or later, call home.

Jonathan Rowe manages content strategy for Autodesk's Sustainability Solutions team. Before joining Autodesk, Rowe worked in green design while pursing a career in architecture. This article originally appeared at Line//Shape//Space, an Autodesk publication dedicated to designers and creators that explores the future of making things, shares inspiring stories of innovation, and offers practical advice to help businesses succeed.

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Image Credits:

  1. Dennis Schroeder / NREL

Aug 25, 2015 1:06 PM ET

by Kelly Vaughn

Arizona State University, not the U. of Arizona has partnered with Ameresco Inc. and Rocky Mountain Institute to craft an implementation plan for campus climate neutrality by 2025 and transportation neutrality by 2035.

Aug 25, 2015 1:44 PM ET

Response to Kelly Vaughn
by Martin Holladay

Thanks very much for the correction.

Interested GBA readers can read more about the partnership here: ASU partners with Ameresco, Rocky Mountain Institute to achieve climate neutrality.

Aug 25, 2015 11:22 PM ET

Edited Aug 26, 2015 11:13 AM ET.

FortZED and the cultural role of district energy design
by Andrew Michler

Having seen the FortZED project go from formation to dissolvement it is important to understand the serious complexity and roadblocks in implementing these programs that promise a lot but fail to yield much in tangible results. The vision was very big but the scope became increasingly narrow to the point that the deliverables were a shadow of the overall vision. Much of the DOE grant went to engineering companies with a couple microgrid generators set up for a temporary demonstration.

While noteworthy it did not inspire the community to engage in any meaningful way and with with proper funding to see what works- ie commercial energy optimization, small scale load shifting, deep energy retrofits, or user behavior. While the billing of the program was to be transformable many volunteers were left in the vacuum of a lack of leadership that matched the vision put forth. The program is attempting to restart but there has not been properly funded and there has not been a serious engagement of the many stakeholders to make a zero carbon/energy district work. This was a fundamental flaw in the original program which was sold as a cultural shift but became a relatively minor technology program.

Lets hope that the lessons from programs like this is that we need to match vision with a broad set of tools, funding and empowered stakeholders from a variety of positions in the community to make any real progress. If that does not happen a small group will quickly stake out a narrow set of objectives (often for the grant monies) and leave the larger community with little resources or direction to make the cultural shift that is inherent in implementing such an important shared goal.

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