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London Borough of Islington
2023-2024
Economics, Energy consulting
The strategy focused on helping the borough identify the most effective ways to support local businesses in cutting costs by installing rooftop solar panels, with funding provided wholly or partially by the council.
The project was delivered as a feasibility study, providing Islington Council with an evidence base, delivery options and strategic recommendations to support future decision-making around borough-wide solar deployment. While the scheme did not progress to implementation at that stage, the work has helped inform the council’s ongoing approach to solar rollout.
The project methodology included a screening assessment to identify suitable commercial building roof spaces, stakeholder engagement activities, a techno-economic model used to assess the viability of different scheme design options including calculation of socio-economic benefits and carbon reduction impacts. The outcome was the prioritised list of viable deployment scenarios and sites that the local authority could then use to approach owners.
The screening and prioritisation process would need to consider scheme size, yield, potential off-take arrangement and scheme financial return (balancing value both to local businesses and the local authority).
Initial challenges such as mapping approach, setting criteria and KPIs for selection, and performing a thorough techno-economic evaluation were addressed. Both technical and commercial aspects were overseen, ensuring the project aligned with the client’s goals and supported a just transition for the community.
These efforts established a robust evidence base and delivery model that could support future solar deployment initiatives for the council and local businesses.
Two stakeholder engagement exercises were undertaken. The first, was a business survey to map existing energy supply characteristics and gauge interest in the scheme, and a second was a workshop designed to capture local businesses’ opinions and requirements for participation.
Site analysis was conducted along with PV array sizing, energy balance assessments, and the development of a techno-economic model to evaluate feasibility. Additionally, socio-economic and carbon impacts were assessed to support the business case.
To enable the mapping of the properties within the borough, a Geographical Information System (GIS) was used. The GIS software captured all commercial properties that had been selected based on agreed criteria. The tool kit was then used to calculate the potential array sizes for each of the buildings.
The potential array size was calculated using the available rooftop area and this was coupled with the LiDAR data to calculate the solar irradiance levels.
Energy use in buildings and PV generation are both transient as they can vary depending on factors such as time of day, weather, location, building type and working practices. In our study we highlighted how the energy balance of the system works and includes aspects such as annual consumption, annual generation, alongside energy imports and exports.
We also developed the considerations that form the business case for the Islington solar scheme split into considerations around ownership, procurement, energy sales, carbon accounting and socio-economic impacts. Our experts developed a techno-economic model, using the annual yield of the systems coupled with their capital expenditure costs, operation and replacement costs over the system’s lifespan. The modelling then calculated the cash flow for the project considering investment interest payable over the loan term and establishing the payback period for the project. A version of the TEM was delivered to the client to allow the local authority to also undertake its own assessment and adjust parameters.
We created a tool to analyse 1,198 non-council rooftops for ~25MWp solar potential in Islington, to support the development of an effective business plan that highlights savings and revenue opportunities for the local authority, while benefiting the community and building climate resilience and adaptation.
The stakeholder engagement provided valuable insight into the community’s perspectives. The business community responded positively to the proposals. Further analysis would need to determine how much of a discount on the energy bill would be required to attract building owners to participate in the scheme. The levels of discount provided by the council to local building owners will need to balance commercial viability and consumer attractiveness for the scheme.
Although the project was delivered as a feasibility study rather than progressing immediately to implementation, it provided the council with a robust evidence base, a detailed understanding of borough-wide solar potential, and clear strategic recommendations that continue to inform future renewable energy initiatives and solar rollout planning.
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