Solar Builder Project of The Year Winner: Moapa Southern Paiute Solar

Moapa Southern Paiute Solar

Category: Ground-Mount (utility-scale)
Moapa, Nev. | 353 MW

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You may remember this project first appearing in our Sept./Oct. issue in which we highlighted the importance of the ground screws in completing the project. It was entered into the Project of the Year awards shortly thereafter and received the most votes in the utility-scale category. So, let’s get reacquainted with it, shall we?

Located 45 minutes northeast of Las Vegas is the Moapa Indian Reservation and tribal members of the Moapa Band of Paiutes are motivated to make better, more sustainable use of their available land. As the Dakota Access Pipeline debacle has revealed, the energy sector doesn’t always treat tribal lands with much respect, and the Moapa Band of Paiutes tribal members have fought for years to close a nearby coal-burning power plant that releases coal ash into their land and could very likely be causing a rise in asthma and other health issues.

Pursuing a renewable energy future here is beneficial beyond economic impact because reliable solar energy that closes this coal plant could change lives.

ttTaming with a screw

The Moapa land is both sacred and severe. The biggest challenge for installing a massive solar array here comes from a soil combination fused together by limestone called caliche, which is typically found in South America.

Encountering a 12- to 24-in. layer of caliche in the United States was an unexpected twist and, to compound the issue, there was about 8 to 12 in. of light sand. This combination was an issue for both typical driven piles and standard surveying methods, and according to project developer Moapa Southern Paiute Solar LLC (a subsidiary of First Solar Electric LLC) both were overcome with the help of TerraSmart solutions.

We highlighted the value of the 128,000 ground screws in Sept./Oct. for being a cost-effective solution that accelerated the installation of the fixed-tilt mounting sysem that supports 3,209,091 modules on 2,000 acres in tough caliche terra.

Because of the loose sand and the requirement to leave as much sacred land unharmed as possible, accuracy was important when pinpointing pile location. So, instead of the standard surveying method of staking points, TerraSmart’s software engineers developed a proprietary software to survey/drill at the project site. This software loaded the rock-drill machines with the coordinates to locate foundation points, and drilling was completed without disturbing unnecessary land and saving money for the developers.

“We were pleased with how respectful the company was of the Moapa land and people,” Moapa Solar stated. “It was unusual for companies to take so much care not to disturb the sacred spaces around the array.”

Check out the other 2016 Project of the Year Winners

20160518-2016-05-18-16.07Power to the people

The project used First Solar’s advanced photovoltaic (PV) thin-film solar modules and is predicted to generate enough clean solar energy to serve approximately 100,000 homes per year, displacing approximately 178,000 metric tons of carbon dioxide (CO2) annually — the equivalent of taking about 34,000 cars off the road. It will also include an onsite substation and a new 5.5-mile 500-kV transmission line that will connect to the existing Crystal Substation serving energy users in California. Moapa Southern Paiute Solar Project has a power-purchase agreement (PPA) with the Los Angeles Department of Water and Power to deliver clean, solar energy for 25 years.

In the end, the project was delivered on time and on budget and became the first utility-scale solar plant on U.S. tribal lands.

— Solar Builder magazine

Solar Builder Project of The Year Winner: Fort Madison Middle School

Fort Madison Middle School

Category: Roof-Mount

Fort Madison, Iowa | 300 kW

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The landmark 1922 Fort Madison Middle School nearly wound up in an Iowa landfill, but thanks to the vision of developer Todd Schneider, and thanks to state-administered funding from the federal Community Development Block Grant (CDBG), the apartment complex is a showcase of renewable energy.

Schneider had already remodeled a number of public schools in Iowa before the middle school fell into his hands. Sorely outdated for school use and empty since 2012, he transformed the three-story building into a 39-unit apartment complex, primarily featuring three-bedroom configurations.

roof mount winner“Designing green definitely helped finance the project because the CDBG is a competitive loan that is scored on a point system, so more points for our green design, including renewable energy, pushed us to the top of the pile,” Schneider says. “It was a one-time CDBG program involving new housing as part of flood relief. There were $124 million worth of applicants across the state, and only $12 million in funds to release, and we got $3 million. The total project cost was $5.5 million, with the remainder borrowed from a local bank. We’re also on track for some historical tax credits to pay down the notes.”

While the project is a for-profit venture, Schneider also retained the gymnasium and the auditorium, which may come to serve more public use. He said members of the class of 1960 have offered to contribute some funding to preserve it.

Since the block grant encouraged renewable energy use, the project was analyzed from a green viewpoint from the beginning. “We worked with an energy auditing company to get appropriate sizing of the PV system,” notes Troy Van Beek, the CEO of Ideal Energy, which planned and installed the 300-kW solar system. “We used lots of insulation.”

The apartments each have varying usage by design — some are gas, some are electric.

“We used gas on the lower level, and as the apartments rise, we used more electric,” Van Beek says. “The 100-kW carport supplies the third floor and part of the first floor. The 200 kW on the roof supplies part of the second and third floors. In the future, there will likely be an electric vehicle charging station in conjunction with the carport.”

RELATED: PV in schools: Education sector is one of solar’s best opportunities 

“Our calculations are that the solar will generate $58,000 to $70,000 worth of electricity per year, so after tax credits, we are looking at an 8.5-year payback,” Schneider says. “The rent includes utilities, but we discount their estimated bills by 20 percent.

Apart from the solar, the second and third floors use air-driven electric heat pumps, and all hot water heaters are electric heat pump driven.

The 200-kW array on the roof supplies part of the second and third floors of the building.

The 200-kW array on the roof supplies part of the second and third floors of the building.

Utility partnership helps The local utility, Alliant Energy, has net metering, so energy will be sold back in the summer and pulled more during the winter.

“It was a clear process working with the utility,” Van Beek notes.

Alliant has a progressive solar program, which includes a corporate renewable center. The utility built an energy learning lab at its Madison, Wis., general office with several types of solar structures, multiple electric vehicle charging stations and an energy battery storage system. This solar learning laboratory enables Alliant to discover the many ways solar energy and renewables can be used in a Wisconsin setting. For Alliant, one of its key projects will be a monitoring interface available onsite and online where anyone can view real-time performance data.
Ideal Energy sees potential for extrapolating lessons learned from this project to community solar projects elsewhere in the state.

“We’d love to do community solar; that’s how the utilities would like to see solar unfold,” Van Beek says. “Nothing has taken hold yet for community solar legislation, but we are doing everything we can politically to promote it; it’s going to happen, but it’s a process.”

In the meantime, Ideal Energy recently expanded its operational footprint to include Minnesota, along with existing Illinois and Iowa business.

“We have coordinated with SolarCity and groSolar and look to handle any size array,” he notes.

Charles W. Thurston is a freelance writer who covers solar energy from Northern California. Reach him at chazwt@gmail.com.

— Solar Builder magazine