Rogers energy-saving plan underway

ROGERS — The city’s $5 million energy savings project and $12.2 million solar panel project is underway as crews look to update the heating and air, lighting and weatherization in 23 city buildings.

“All portions of the project have begun in some manner, but it will be a while before any portion is totally complete,” said David Hook, facilities development manager.

The work includes replacing fluorescent lights with LED, improving building envelopes and installing energy management control systems and heating, ventilation and air conditioning units. Building envelopes are the components of buildings that create a thermal barrier between the interior and exterior of a building.

Work on the lighting and building envelope improvements has been done in multiple buildings and should be complete within a few months, Hook said.

The Rogers City Council hired Johnson Controls of Little Rock last year to do an energy audit of city facilities. The company recommended an energy savings project and solar panels.

The council approved the energy savings project at an Oct. 26 meeting and the solar panel project at a Nov. 4 meeting.

The solar array project will be the largest publicly owned solar facility in Arkansas, according to a news release from Johnson Controls. It will also make Rogers the first city in the state to use 100% renewable energy, said Peter Masonis, city public information director.

The next phase of the project to cross the finish line will be the heating, ventilation, and air conditioning upgrades, according to Hook.

“The HVAC units have been ordered but it will be around August before they start arriving on the various sites,” said Hook. “Some of those units will likely not arrive and be installed until late this year due to supply issues.”

“New wiring has been installed in all facilities for the controls system but the controllers themselves will not be installed until the HVAC improvements are complete,” he said.

Though the paperwork process has begun for the solar portion of the project, it won’t be complete for another nine to 12 months due to the approval procedure through the state and utility companies, according to Hook.

SOLAR SAVINGS

The solar arrays, totaling 4.6 megawatts, will be installed at the city recycling center, Fire Station No. 8 and on a covered parking lot at the Police Department.

A megawatt is a unit measuring electrical power that is equal to one million watts. One megawatt of solar can power an average of about 110 homes annually in Arkansas, according to the Solar Energy Industries Association, a national nonprofit trade association for the industry.

Rogers’ solar equipment has a guaranteed life of 30 years, according to the release from Johnson Controls.

The panels are predicted to generate more than 157 million kilowatt hours of electricity, a value of over $15 million in utility, operations and maintanence savings, according to the release.

The projects are being paid out of the city’s reserves.

The city has paid $4,498,976 to date of the $17,995,904 contract for the projects, finance director Casey Wilhelm said.

Wilhelm said the city used a small portion of the 2018 bond issue, which included building improvements to the heating, ventilation and air conditioning system at the Police Department, to cover new HVAC units.

At an interest rate around 2.2% and payback over 20 years, the city would save about $1 million in interest by self-financing the energy savings project and $3 million in interest by self-financing the solar project, according to Wilhelm.

Johnson Controls has guaranteed both projects will pay for themselves in 20 years, agreeing to pay the difference if the improvements don’t meet the numbers the company has set.

As a result of the project, the city’s energy bills will be lowered by 1 watt of energy for every watt of electricity generated, Hook said in November.

LOCAL CITY EFFORTS

Almost 90% of renewable energy transactions by local governments in the United States have been solar energy deals, though wind projects have shown a far greater capacity. Wind projects average a capacity of 72 megawatts per project, over three times the average solar project capacity, according to the American Cities Climate Challenge, an initiative launched by Bloomberg Philanthropies to track lowered carbon emissions.

However, access to steady wind is rare in most cities, with many exceptions in the Southwest and Midwest regions, according to the initiative.

Rogers is not alone in efforts to transition Northwest Arkansas to renewable energy for public properties. It also isn’t alone in using solar energy.

Fayetteville’s two wastewater treatment plants have run on solar energy since 2019.

Solar arrays at the two plants, each 5 megawatts, generate enough energy to support about two-thirds of the city’s municipal operations, according to Peter Nierengarten, city environmental director.

Today’s Power Inc., a subsidiary of the Arkansas Electric Cooperatives, owns 99% of the solar energy systems while the city owns 1% and the land, he said. Ozarks Electric Cooperative is also a part of the trilateral power purchase agreement.

Each plant also has its own battery storage system, according to Nierengarten.

Solar power purchase agreements like Fayetteville’s allow cities to take advantage of federal incentives and lower the cost of a solar array, he said.

The deal allowed the city to lock in the purchase price of generated electricity for 20 years, he said.

As the retail electric rate has risen during the last few years, the city is saving even more than originally planned.

Nierengarten said the city saved $400,000 last year due to the solar arrays — about $250,000 more than expected.