Zero energy buildings on the rise across the U.S.: report

Report finds projects expanding in number, geography, and building type of zero energy commercial buildings as well as zero energy-capable buildings.

03/07/2012


A new report released today by the New Buildings Institute (NBI) and the Zero Energy Commercial Building Consortium (CBC) reveals that zero energy commercial buildings—highly efficient buildings that produce as much energy as they use through on-site renewable resources—are cropping up across the United States from California to New York state.

The report, “Getting To Zero 2012 Status Update: A First Look at the Costs and Features of Zero Energy Commercial Buildings” examines the number, location, costs, and design strategies of various types of zero energy commercial buildings (ZEBs) as well as zero energy-capable (ZEC) buildings, which are energy efficient enough to be zero energy, but have not taken the final step of on-site renewable generation. It is the most comprehensive look at the state of zero energy commercial buildings to date.

NBI is a nonprofit organization working collaboratively with commercial building professionals and the energy industry to promote better building energy performance. CBC members include over 450 commercial building stakeholders committed to charting a path for achieving net-zero energy commercial buildings. The National Association of State Energy Officials (NASEO) serves as the secretariat for the CBC and also co-sponsored the study.

The report identifies 99 buildings that are either zero energy, zero energy-capable or ZEBs currently under construction or recently completed with limited performance data. It finds that the number and diversity of commercial ZEBs and ZECs are growing and can be found in most climate zones. The technologies as well as design and construction practices used to create these buildings are readily available today.

While in the past, ZEBs were primarily small, “demonstration” buildings, projects are expanding in size and building type. Today’s ZEBs are still mostly small buildings, but include K-12 schools, offices, university buildings, recreation centers, assembly halls, and more. Among the innovative buildings capturing the attention of architects and builders are the IDeAs Z2 Design Facility in San Jose; Hudson Valley Clean Energy Headquarters in Rhinebeck, N.Y.; and Richardsville Elementary School in Bowling Green, Ky. 

Key report findings include:

  • ZEBs have been successfully built in most climate zones of the United States.
  • The majority of ZEBs to date are small or very small buildings, however there are increasing examples of larger and more complex buildings. Many of the earliest examples are academic buildings or environmental centers, in effect, demonstration buildings sometimes with low occupancy levels. More recent buildings include office buildings, K-8 schools and a credit union; buildings that represent large numbers of “average” or typical buildings.
  • ZEBs are constructed using readily available technology. An integrated design approach with careful attention to building site and layout, envelope, mechanical systems, and electrical systems is critical to achieve the high levels of energy efficiency. Unique or experimental systems are infrequently used to reach net zero goals, but the emergence of new technologies will be a factor in the expansion to more building types.
  • Modeling studies indicate costs of 3% to 18% for energy efficiency features, depending on building type, size, climate and other variables. Reported incremental costs are only available from a few ZEB projects making conclusions or trends difficult to derive from the limited information available. However, the few reported ZEBs appear to show lower overall incremental costs than modeled estimates, possibly due to positive trade-offs with other features in the design and construction process. Those costs range from 0% to 10%.

The report also summarizes recommendations that would encourage additional development of ZEBs such as: practical guidance for the commercial building community including cost information for owners; increased measurement and communication of results on successful design strategies and technology applications; and better benchmarking to define expectations for performance of highly energy efficient buildings.

- Edited by Chris Vavra, Consulting-Specifying Engineer, www.csemag.com 



No comments
Consulting-Specifying Engineer's Product of the Year (POY) contest is the premier award for new products in the HVAC, fire, electrical, and...
Consulting-Specifying Engineer magazine is dedicated to encouraging and recognizing the most talented young individuals...
The MEP Giants program lists the top mechanical, electrical, plumbing, and fire protection engineering firms in the United States.
High-performance buildings; Building envelope and integration; Electrical, HVAC system integration; Smoke control systems; Using BAS for M&V
Pressure piping systems: Designing with ASME; Lab ventilation; Lighting controls; Reduce energy use with VFDs
Smoke control: Designing for proper ventilation; Smart Grid Standard 201P; Commissioning HVAC systems; Boilers and boiler systems
Case Study Database

Case Study Database

Get more exposure for your case study by uploading it to the Consulting-Specifying Engineer case study database, where end-users can identify relevant solutions and explore what the experts are doing to effectively implement a variety of technology and productivity related projects.

These case studies provide examples of how knowledgeable solution providers have used technology, processes and people to create effective and successful implementations in real-world situations. Case studies can be completed by filling out a simple online form where you can outline the project title, abstract, and full story in 1500 words or less; upload photos, videos and a logo.

Click here to visit the Case Study Database and upload your case study.

Protecting standby generators for mission critical facilities; Selecting energy-efficient transformers; Integrating power monitoring systems; Mitigating harmonics in electrical systems
Commissioning electrical systems in mission critical facilities; Anticipating the Smart Grid; Mitigating arc flash hazards in medium-voltage switchgear; Comparing generator sizing software
Integrating BAS, electrical systems; Electrical system flexibility; Hospital electrical distribution; Electrical system grounding
As brand protection manager for Eaton’s Electrical Sector, Tom Grace oversees counterfeit awareness...
Amara Rozgus is chief editor and content manager of Consulting-Specifier Engineer magazine.
IEEE power industry experts bring their combined experience in the electrical power industry...
Michael Heinsdorf, P.E., LEED AP, CDT is an Engineering Specification Writer at ARCOM MasterSpec.