Before one of the largest baking companies in the world installed a solar microgrid with a 30-ton battery at its food processing plant in San Jose, Costa Rica, the plant experienced two to five power interruptions daily, either in the form of outages or poor power quality. Contact online >>
Before one of the largest baking companies in the world installed a solar microgrid with a 30-ton battery at its food processing plant in San Jose, Costa Rica, the plant experienced two to five power interruptions daily, either in the form of outages or poor power quality.
When such power snags occurred at the plant, conveyor belts moving baked goods to and from ovens stopped, and the baked goods burned. These power interruptions can cost $2,000 to $15,000 per event, said Ignacio Salazar, head of special projects for Greenenergy, a San Jose-based solar microgrid provider that deployed the Bimbo system in January.
Working with Greenenergy, the bakery installed solar PV with a total peak capacity of 162 KW at three sales centers, a distribution center and on the roof of the processing plant. At the plant, the company also added the battery, which has 2.7 MWh of capacity.
The PV installations are located within a 50-kilometer radius of each other, Salazar said. Each PV installation serves its own building and only the PV at the food processing plant is part of the microgrid.
Once the grid-tied microgrid was installed in January, it kept electricity flowing during 95% of the power quality and outage events – nearly 300 events. “The other 5% are very long outages that we can''t sustain,” Salazar said. With its ability to ride through most power interruptions, the multi-million dollar microgrid system is expected to yield a 3-year payback.
In Costa Rica, installing the solar array and battery at the 30-year-old food processing plant posed many challenges. Roof space for solar was limited by skylights and equipment on the roof. In downtown San Jose, where the plant is located, there was very little space available for the battery, which is housed in a container that covers about 300 square feet.
“It was the only real space they had left, the most precious real estate they had. It was pretty important to negotiate with them so they could give us this space; they had eaten up most of their real estate,” he said.
In the downtown location, it was especially important to ensure the battery was fire safe. Greenenergy only installs lithium iron phosphate batteries for safety reasons. This type of battery isn’t subject to catastrophic thermal runaway, said Salazar.
Fire safety regulations called for the battery system – which includes a fire suppression system – to be installed outside. Greenenergy also reconfigured the battery’s fire suppression system to make it easier for firefighters to access the battery. The company installed a fire hose adapter so firefighters could connect their hoses directly to the battery container and flood it, said Salazar.
The battery can provide a number of benefits, including resilience during outages, electric bill savings, power quality correction and blackstart capabilities, said Salazar.
It’s also set up to provide grid services, once there’s a market for them. Right now Greenenergy is working to establish a grid services market in Costa Rica, where the government owns electricity generation and transmission assets.
Costa Rica recently passed a new distributed energy resources (DER) law, which shifted solar compensation from net metering to net billing. It creates a new tariff system for paying DER owners when they export solar or other resources to the grid.
“The new legislation recognizes that batteries are a thing and microgrids a possible configuration,” he said. It doesn’t expand the market yet, but may lead to a demand response market and new revenue streams for microgrids, Salazar added.
“The battery energy storage systems are complex solutions that will provide a lot of revenue streams,” Salazar said. “It’s not like solar where you only have savings. That’s a one-trick clown.”
With its sophisticated control system, the bakery microgrid in Costa Rica does many tricks – including islanding in about 9 milliseconds and re-connecting to the grid in the same timeframe.
Typically a microgrid is quick to enable off-grid, but going back online takes a minute or so.” This system can go from off-grid to on-grid in 8 milliseconds,” he said.
Demand Energy and Rio Grande Renewables have commissioned a battery storage-plus-solar-PV microgrid at Establishment Labs S.A., a medical manufacturing plant in Costa Rica. The system provides multiple on-site and grid-assisting services, including peak demand reduction, solar PV "shaping" to smooth out variability, and backup power for critical loads in the event of an outage.
The microgrid, which is the largest in Central America, includes a 500-kW/1 MWh lithium-ion battery storage resource connected to 276 kW of solar PV. It is controlled by Demand Energy''s Distributed Energy Network Operating System (DEN.OS), which optimizes how these resources interact and perform. Under normal conditions the system will smoothly integrate intermittent solar PV for on-site self-consumption. When an outage occurs, the microgrid will "island" itself off from the grid and continue operating in standalone mode.
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