City of San Luis Obispo
Established a resilient, off-grid microgrid pathway supporting critical services and nearly half a million dollars in cost reduction

Summary
Optony partnered with the City of San Luis Obispo (SLO) to analyze energy generation and storage needs and the feasibility to install an off-grid microgrid system capable of supporting critical public safety facilities.
As part of the project, Optony also supported the City in negotiating with a selected solar integrator to optimize solar system sizing and to plan for future battery and microgrid installation with the availability of anticipated outside funding.
The Challenge
To support SLO’s community-wide goal of carbon neutrality by 2035, the City commissioned a feasibility study for a solar photovoltaic (PV) and battery energy storage system (BESS) microgrid at the Fire Station 1 and 911 Dispatch Center campus. The project aimed to reduce reliance on fossil fuels and enhance energy resilience during outages while maintaining critical emergency services.
Our Approach
Optony began its work on the City of SLO’s microgrid by analyzing detailed facility load data, projected utility tariffs, and evolving costs for solar PV and battery energy storage systems (BESS). Using its proprietary modeling platform, MDOCS, Optony simulated system performance over the full lifecycle—accounting for degradation, weather variability, and rate structures—to evaluate financial outcomes and identify the optimal system configuration.
The team focused on the Fire Station 1 and 911 Dispatch Center campus, assessing current energy use, outage requirements, and site constraints. Through this analysis, Optony designed a microgrid-ready solution that maximizes on-site solar generation while ensuring seamless transition to resilient backup power. In collaboration with ForeFront Power, the team developed a solar carport design that fits within space limitations and avoids costly utility upgrades, enabling immediate deployment while preserving flexibility for future integration.
Modeling results demonstrated how a 131 kW solar system paired with a future 63 kW / 511 kWh battery could reduce operating costs, enhance energy resilience, and support the City’s carbon-neutral goals. By combining rigorous data analysis, advanced modeling, and strong project partnerships—including participation in Central Coast Community Energy—Optony delivered a clear, phased pathway for SLO to implement clean energy today while building toward a fully resilient, self-sustaining microgrid.
Emergency power system
Capable of supporting operations for 6 hours in 100% of emergency situations, 12 hours in ~83% of emergencies, and 24 hours in ~18% of emergencies.
$491,000+ saved
Over a 20-year term.
Supports goal of carbon neutrality by 2035
Reduces CO2 emissions by 496 pounds for every hour by replacing a diesel-powered generator to PV + BESS.
Future-ready solutions
Strategies for both the immediate and long-term resilience and energy-saving goals were delivered.
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The Solution
Optony’s solar assessment determined that a newly proposed 131 kW solar PV carport system could offset approximately 55% of the site’s annual energy use—saving an estimated $491,000 over a 20-year term—and position the campus to transition toward clean, reliable, and self-sustaining energy operations. By transforming an underutilized parking area into a high-performing solar asset, the project introduces a durable and highly visible sustainability feature that directly supports the City’s carbon neutrality goals.
Beyond the immediate benefits of solar, Optony’s study identified a clear path for resilience: a future 63 kW / 511 kWh battery energy storage system that would deliver up to six hours of backup power during outages and dramatically reduce emissions from the existing diesel generator. Although installation of the battery is planned for a later phase pending outside funding, the recommended approach ensures that today’s solar investment is fully microgrid-ready. The system is intentionally designed with the electrical infrastructure, layout, and interconnection capacity needed to enable a future battery to be added with minimal disruption—essentially allowing the equipment to plug directly into a pre-configured microgrid backbone. This strategic, phased approach allows the City to take immediate action on its clean energy goals while keeping the path open for enhanced resilience and sustainability upgrades.
This phased strategy is both innovative and scalable. By deploying solar now and integrating microgrid-ready components from the outset, the City avoids future redesign costs and preserves the flexibility to expand the system as funding, technology, and program opportunities evolve. The project showcases a modern approach to resilience planning: using today’s clean energy investment to unlock tomorrow’s backup power capabilities.
Several technological and design elements make the solution particularly forward-thinking. The carport array is engineered to support a hybrid solar-plus-storage configuration and is coordinated with ForeFront Power’s PPA structure to streamline long-term ownership, operations, and service. The microgrid analysis also incorporates Optony’s advanced modeling through MDOCS, ensuring the recommended battery size, duration, and charging strategy are optimized for the campus’s unique load patterns and emergency-response priorities. Together,
these design choices create a blueprint that other municipalities can scale, replicate, and adapt—demonstrating how thoughtful planning can turn a single site into a resilient energy hub for years to come.
Solutions Delivered
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Load Forecasting
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Resilience Planning
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Microgrid Assessment & Planning
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Solar Feasibility Assessment
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Battery Energy Sizing System Sizing and Assessment
Sustainability Impact
By supplementing the utilization of the onsite 300 kW diesel generator with solar PV and BESS, the City can reduce the amount of CO2 emissions
from burning fossil fuels. The City is estimated to reduce CO2 emissions by 496 pounds for every hour the generator does not need to run.
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By utilizing all available space at the Fire Station 1 and 911 Dispatch Center campus to develop rooftop and parking lot carport arrays, PV generation can be maximized to
account for most if not all of the current and future annual electricity consumption on site.
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Proposed ForeFront BESS microgrid design and historical energy consumption of the shared campus, predicts that a 62 kW / 511 kWh BESS enables 6-hour outage coverage in 100% of scenarios, without load shedding.
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The proposed modeled system would deliver 12-hours of power in ~83% of outages and 24-hours of power in ~18% of outages, highlighting limits without load management.

