Joulen and HSEnergy partner to unlock value from distributed solar through scalable flexibility aggregation and energy market participation 

Joulen today announces a strategic partnership with HSEnergy to deliver a multi-year energy optimisation and market participation contract across a large-scale portfolio of UK residential and commercial solar and battery assets.

The partnership combines HSEnergy’s installed base spanning several thousand residential systems alongside a growing number of commercial and industrial (C&I) sites with Joulen’s optimisation, aggregation and market trading capabilities.

For households, this partnership will support lower energy costs and new income opportunities, while for businesses it enhances asset returns, improves energy cost management, and strengthens operational efficiency.

Optimising distributed assets for market participation

At the core of the partnership is Joulen’s ability to aggregate, optimise and orchestrate a diverse portfolio of distributed energy assets as a single, coordinated system.

Through this contract, HSEnergy’s portfolio will be able to:

• Optimise generation, consumption and export against real-time market price signals • Store and dispatch energy assets in response to system and market conditions • Access Capacity Market (CM) revenues through aggregated flexibility • Enable participation in energy and flexibility markets through aggregated portfolio optimisation • Stack multiple value streams, including energy cost reduction, market revenues and grid services

By operating as a coordinated portfolio rather than individual systems, both residential and commercial assets can access value streams not achievable independently.

Joulen: aggregation, optimisation and trading

Joulen combines AI-driven optimisation through its PARIS platform with in-house market execution capability, operating as both an aggregator and trading partner. By aggregating HSEnergy’s residential and C&I assets, Joulen creates the scale and diversity required for effective participation across energy and flexibility markets.

This integrated model enables more effective utilisation of distributed flexibility across asset types.

Scaling through a diversified asset base

HSEnergy’s combined residential and commercial footprint provides a strong route-to-market for scaling flexibility. Together, Joulen and HSEnergy will:

• Expand access to energy markets across residential and C&I assets
• Improve asset performance and financial returns
• Reduce peak demand through coordinated flexibility
• Support grid resilience and renewable integration

Chris Doherty, CEO of Joulen, said: “This partnership with HSEnergy highlights the opportunity across both residential and commercial energy. By aggregating and optimising distributed assets, we’re enabling them to operate as part of the wider energy system, delivering stronger financial performance while supporting a more dynamic and resilient grid.”

Maria Flowers, Chief Revenue Officer at Joulen, added: “We’re enabling market access across a diverse portfolio of behind-the-meter assets at scale. By combining aggregation with expertise across wholesale and flexibility markets, we’re unlocking new revenue streams that extend beyond traditional energy supply models.”

Neil Mitchell, CEO of HSEnergy, said: “Partnering with Joulen allows us to extend the value we deliver across both our residential and commercial customer base. By connecting these assets to energy markets, we’re creating new opportunities while supporting a more flexible and efficient energy system.”

As the energy transition accelerates, both residential and commercial energy assets are becoming increasingly central to system flexibility. This partnership demonstrates how distributed solar and battery systems across homes and businesses can be aggregated, optimised and deployed as grid-facing resources, delivering commercial value while supporting system stability and decarbonisation.