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Efficient Existing Public Buildings

Action 1: Enter baseline information into the Minnesota B3 Benchmarking database and routinely enter monthly energy use data from all city-owned buildings.

Woodbury has entered data into the Minnesota B3 Benchmarking database for all of its buildings. Some buildings have data back to 2002. City staff update the database monthly. The city uses the information to compare energy efficiency for all city-owned buildings.

Completed Feb. 28, 2013.

Action 2: Make no/low cost facility operations & maintenance changes to city-owned/school buildings to reduce energy costs.

Some of the low and no cost changes include the installation of vending misers at City Hall, Central Park, and the Public Works building; adjusting parking lot lighting at city facilities to turn off between 11:00pm and 5:00am; installation of occupancy sensors at City Hall, Public Safety, the Public Works building, and the fire stations; installation of low-flow water fixtures for all city remodeling or construction projects; and lighting retrofits for all city buildings. At Central Park, the winter temperature for the facility was reduced to 69 degrees from 71 degrees. Summer temperatures were also increased to save energy. Thirty-two watt lamps were replaced with 25-watt lamps at Central Park. In the fire stations, night lighting in the parking bays were reduced to save energy.

Completed April 26, 2013.

Action 3: Invest in energy efficiency opportunities through recommissioning/retrofitting city-owned/school buildings or by using the Guaranteed Energy Savings Program.

All city buildings have had recommissioning studies completed, as well as lighting retrofits. In 2007, Woodbury City Hall was remodeled, including a 13,841 sq. ft. addition to the building. Energy improvements included a geothermal system, a south-facing glass facade to maximize daylight, energy efficient mechanical and electrical systems, energy efficient lighting, and occupancy sensors. An energy management system allows the city to control the energy use based on occupancy. The project also featured installation of a green roof, porous paver parking stalls, low-flow water fixtures, a rain garden, and the installation of "Grasspave" and "Advanced Turf" along walking paths to handle truck loads without adding impervious surface.

In 2009, Woodbury replaced the existing ice arena refrigeration system at Bielenberg Sports Center with an energy-efficient geoexchange (or ground source heat) system. The new system is estimated to prevent 1,024 metric tons of CO2 emissions and result in $100,000 in utility cost savings. The project also included installation of low emissivity ceilings, a new energy management system, and fixture retrofits for water conservation.

During the Summer of 2011, the city remodeled and expanded the public safety building to include a geothermal system for heating and cooling. In October 2012, a 40kW solar PV array was installed on the building. The project also included the addition of a parking garage for public safety vehicles. Since the vehicles previously idled for long periods to keep computer and medical equipment from freezing, the garage eliminated the need for continuous idling. Fuel savings averaged throughout the year equals 1,100 gallons of fuel each month.

Completed April 26, 2013.

Action 4: Implement information technology efforts and city employee engagement to reduce plug loads and building energy use.

The Use and Energy Conservation section of the city’s Technology Policy (AD-IT 5.2) recommends each employee power down computer monitors at the end of a regular work day and the entire computer system and printers if they will not be returning the following day. It also states that desktops have been programmed to “go into an energy-saving state after twenty minutes of inactivity.” The City of Woodbury has virtualized 53% of their servers which allows servers to run on the same physical server computer which reduces their overall electrical use and heat generation.

The city also has purchased ultra slim desktop computers for over 90% of the city staff which are Energy Star qualified, EPEAT Gold with 87% efficient external power supply configuration. The city has installed occupancy sensors for lights in all offices in City Hall and Public Safety. Woodbury City Council passed a resolution to be an Energy Star Partner in 2009.

Completed: April 23, 2013.

Action 5: Document that the new construction or major remodeling of public buildings has met or qualifies for a green building framework.

In July 2009, the City Council passed a resolution to adopt a Sustainable Building Standard for New and Renovated Municipal Buildings in the City of Woodbury. The resolution states that at a minimum, the city will utilize the B3-State of Minnesota Sustainable Building Guidelines in the planning, design, construction and commission of new buildings and major renovations greater than 5,000 square feet that are owned by the City of Woodbury.

Woodbury City Hall is Energy Star Certified. The B3 guidelines were utilized in the renovation and expansion of the building in 2007. Since the resolution was adopted, the renovation and expansion of Public Safety (2011) was documented through the B3 process.

The upcoming expansion of the Bielenberg Sports Center is being documented through the B3 process, as well as Xcel's Energy Design Assistance Program. The new building also will meet the SB 2030 standards. Construction at Bielenberg began spring 2013.

Completed April 23, 2013.

Action 7: Install for one or more city-owned/school buildings one of the following energy efficiency measures:

1.  A district energy/microgrid system.

2.  A ground-source, closed loop geothermal system.

A closed loop geothermal system has been installed in three city facilities, including: Woodbury City Hall in 2007, Bielenberg Sports Center in 2009, and the Public Safety Building in 2011.

The Woodbury City Hall project included a 13,841 square foot expansion to the current building. In addition to the geothermal system, other energy efficiency upgrades included lighting and occupancy sensors, and an energy management system. Even after the expansion, the total energy used at City Hall has remained steady compared to energy use prior to the expansion.

The geothermal system at the Bielenberg Sports Complex replaced the existing ice arena refrigeration system. Other energy improvements included low emissivity ceilings, and an energy management system. Following project completion, total energy use at the facility dropped 35% in 2010 and has continued to drop each year after.

Completed April 23, 2013.