Optimizing Solar and Battery Storage Revenue

Overview

The Chappice Lake Solar and Storage facility, located near Medicine Hat in southern Alberta, is a first in Canadian energy infrastructure on multiple counts. Developed by Vancouver-based Elemental Energy and part-owned by Cold Lake First Nations, the project delivered the first utility-scale solar facility in Alberta to be paired with a vanadium flow battery in a direct-current (DC) configuration. The $45.3 million project — which received $10 million through Emissions Reduction Alberta's Shovel-Ready Challenge — came online in 2023 and is designed to run for 35 years.

The 22.1 MWdc solar array generates approximately 37,600 MWh of clean electricity annually, enough to serve around 5,000 Alberta homes. The 2.9 MWac / 8.3 MWh vanadium flow battery, supplied by Invinity Energy Systems, sits alongside it in a DC-coupled configuration — an architecture chosen specifically to maximize generation capacity within the site's grid interconnection constraints.

Arcobi — operating as Arcus Power Corp at the time, was engaged to manage battery dispatch.

Challenge

The DC-connected configuration was both the project's defining technical feature and its primary operational challenge. By coupling the battery directly to the solar array on the DC side of the inverter, Elemental Energy was able to install significantly more solar capacity than the grid interconnection would otherwise support — effectively squeezing more generation out of a constrained site. But this architecture introduced a level of dispatch complexity that standard rule-based control systems weren't built to handle.

The battery needed to coordinate with solar generation, grid conditions, and AESO market prices simultaneously. Charging too early or discharging at the wrong time against AESO's real-time pricing would erode project economics. The Power Plant Controller managing the flow of power between the solar array, the battery, and the grid needed to make these decisions automatically, continuously, and in response to market signals — not on a fixed schedule.

No project in Alberta had done this before at utility scale. Machine learning-based battery dispatch was unproven in the province's market context.
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Solution

Arcobi designed and built the systems that run battery dispatch at Chappice Lake. The work covered three areas.

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1. Custom Power Plant Controller (PPC)

Arcobi developed a purpose-built Power Plant Controller to manage the coordinated flow of power between the solar array, the vanadium flow battery, and the AESO grid. The PPC operates the battery's charge and discharge cycles automatically, respecting the site's interconnection limits while optimizing dispatch against market conditions. This was the first successful deployment of ML-based battery dispatch in Alberta.

2. ML-Driven Dispatch via AI Forecasts

The dispatch logic runs on machine learning algorithms fed by Arcobi's AI Forecasts platform. Rather than following a fixed schedule, the system uses price forecasts and real-time market data from DataHub to determine when to store energy and when to release it. The primary strategy is solar shifting: the battery stores excess generation during lower-priced daytime windows and discharges when AESO prices are higher — typically in the evening peak. The ML layer ensures the system is learning from actual market outcomes and refining its dispatch decisions over time.

This approach is designed to position the facility for participation in AESO's ancillary and operating reserve markets as those opportunities arise, rather than treating the battery as a simple arbitrage asset.

3. Smart Demand Optimization

Arcobi also developed a custom controller for the facility — separate from battery dispatch, but connected to the same goal of optimizing the project's net economics. The controller minimizes the facility's own electrical demand charges by maximizing the use of heat generated by the battery energy storage system itself, and by prioritizing electrical heating during solar generation hours. It's a relatively small system, but it's an example of the kind of site-level optimization that compound over a 35-year asset life.

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Why the Vanadium Flow Battery Changes the Dispatch Equation

The VFB chemistry matters for how Arcobi approaches dispatch. Unlike lithium-ion batteries, vanadium flow batteries do not degrade in energy capacity with charge and discharge cycles. The battery at Chappice Lake will hold the same 8.3 MWh of capacity in year 35 that it holds today. That means the dispatch strategy can be optimized entirely for market value — there's no need to manage cycle counts or manage depth-of-discharge to protect battery life. The ML model can run the battery hard when market conditions warrant it.

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What This Project Established

Beyond the economics of the Chappice Lake facility itself, the project produced two things that extend beyond it:

The Power Plant Controller and ML dispatch framework Arcobi built here is now a validated template for DC-connected PV-VFB configurations in Alberta. Future projects of this type in the province have a working reference — both in terms of the technical architecture and the dispatch methodology. ERA Alberta has cited this explicitly as a replicable model.

And the project demonstrated that ML-based battery dispatch, which had been deployed elsewhere but never in the Alberta market context, works in AESO's specific pricing environment. The operational data from Chappice Lake — how the battery performs across seasonal AESO price patterns, how it handles Alberta's extreme cold, how the DC-coupled configuration behaves at scale — is real-world evidence that didn't exist before 2023.

For Cold Lake First Nations, the project also delivers revenue participation and a meaningful role in Alberta's clean energy sector, with employment and capacity development embedded in the project structure.

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Why This Matters for IPPs in Alberta

Battery storage projects live or die on dispatch quality. The hardware specs determine the ceiling; the dispatch intelligence determines how close you get to it. A vanadium flow battery running on a fixed schedule captures a fraction of the value of one running on ML-driven price forecasts and real-time market signals.

Chappice Lake is the first proof point in Alberta that this approach works at utility scale. For developers considering DC-coupled storage configurations in grid-constrained areas of the province, it's the closest thing to a playbook that currently exists.

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Developing a solar or storage project in Alberta or elsewhere in Canada? Let's talk about what the dispatch layer needs to look like to maximize your asset's market value.