BESS FAQs — Everything You Need to Know About Energy Storage

JS Energy is a specialist battery energy storage system (BESS) consultancy with over 15 years of experience. We connect battery suppliers with global markets and help businesses plan, procure, and deploy energy storage systems. Whether you're a manufacturer looking to grow in new regions or an organisation ready to deploy storage, JS Energy provides the expertise to make it happen.

JS Energy operates across two core areas. For battery suppliers, we act as an outsourced sales and business development partner — opening doors, building relationships, and accelerating market penetration. For businesses deploying energy storage, we manage the full project lifecycle from feasibility and procurement through to installation and ongoing maintenance.

JS Energy works with two main audiences — battery and energy storage suppliers looking to enter or expand in new markets, and organisations deploying BESS for commercial, industrial, or utility purposes. Our clients have included global logistics companies such as DHL, telecoms providers such as BT, universities such as Swansea University, defence organisations such as QinetiQ, and agricultural businesses such as Fram Farmers.

JS Energy operates globally. While we are based in the UK, our supplier services and project consulting span international markets. We have delivered projects across Europe and support battery suppliers in entering markets worldwide.

JS Energy has over 15 years of experience across the global energy storage value chain. Our team has hands-on expertise spanning market entry strategy, commercial negotiations, procurement, project management, and BESS installation and maintenance — giving our clients a single trusted partner across every stage of their energy storage journey.

JS Energy brings together deep industry expertise, an extensive network of suppliers and project owners, and a proven track record of delivering real results. We have helped clients achieve significant cost savings — including 40% cost reductions on major deployments — while delivering projects on time and within budget. We offer both full end-to-end support and flexible fractional consulting, so you get exactly the level of involvement you need.

JS Energy acts as an outsourced sales and business development partner for battery suppliers. We use our extensive network and market knowledge to open doors in new regions, generate qualified leads, develop distribution channels, and support commercial negotiations — helping you grow faster and more efficiently without the cost of expanding your internal team.

JS Energy has experience across a wide range of energy storage markets including EV charging, residential and commercial storage, telecom and network power, utility-scale projects, and logistics. We help battery suppliers identify the right markets for their products and build the relationships needed to succeed in them. Our supplier services span the UK, Europe, and international markets.

Channel development is the process of identifying, qualifying, and building relationships with local distributors, integrators, and project developers who can sell and deploy your products in new markets. Without the right channel partners, even the best battery technology struggles to reach the right customers. JS Energy's channel development service ensures your products reach the right markets with the right partners — driving consistent growth and brand trust.

JS Energy leverages over 15 years of relationships across the energy storage sector to connect battery suppliers with high-value project opportunities. We identify prospects, make introductions, and qualify opportunities on your behalf — acting as an extension of your sales and business development team in markets where you may have limited presence or resource.

JS Energy provides expert guidance through the full commercial process — from initial proposals and supplier negotiations through to contract structuring and finalisation. We help battery suppliers protect their margins, navigate complex procurement processes, and close deals with confidence. Our commercial support service ensures opportunities move smoothly from discussion to delivery.

No. JS Energy works with battery suppliers regardless of where they are based. Many of our supplier partners are international manufacturers looking to enter or grow in UK and European markets. We act as your local presence — providing the market knowledge, relationships, and commercial support needed to succeed. Get in touch to discuss how we can support your market entry.

Unlike a traditional distributor, JS Energy does not take ownership of your products or add margin through resale. Instead, we act as a strategic partner — focused entirely on growing your market presence, developing the right channel relationships, and supporting commercial negotiations on your behalf. This means your brand, your pricing, and your customer relationships remain under your control while you benefit from our network and expertise. Learn more about our supplier services.

A battery energy storage system (BESS) is a technology that stores electrical energy in batteries for later use. BESS can be charged from the grid, solar panels, or other renewable sources, and discharged when energy is needed — helping businesses reduce energy costs, improve resilience, and lower their carbon footprint. Systems range from small commercial installations to large utility-scale deployments of multiple megawatt-hours.

While it is possible to approach BESS deployment without expert support, the procurement process, supplier landscape, and technical requirements are complex and fast-moving. An experienced BESS consultant like JS Energy helps you avoid costly mistakes, identify the right suppliers, negotiate better contracts, and ensure your project is delivered on time and within budget. Our clients have achieved cost savings of up to 40% compared to going it alone.

BESS costs vary significantly depending on system size, chemistry, application, and location. A small commercial system might start from tens of thousands of pounds, while utility-scale deployments can run into millions. The procurement strategy and supplier selection process has a major impact on final cost — JS Energy's procurement and supplier selection service has delivered cost reductions of 40% or more on major projects. Contact us for guidance specific to your project.

The timeline for a BESS deployment depends on the scale and complexity of the project. A typical commercial installation can take anywhere from a few months to over a year from initial feasibility through to commissioning. Key factors include grid connection applications such as G99 or G100, procurement lead times, planning requirements, and site preparation. JS Energy's project management service is designed to keep your deployment on track and on schedule from day one.

A BESS feasibility study assesses whether energy storage is the right solution for your organisation, and if so, what size and type of system would deliver the best return. It typically covers your current energy usage and costs, potential savings and revenue streams, suitable system specifications, grid connection requirements, and an indicative business case. JS Energy's feasibility and business case analysis service gives you the clarity needed to make an informed investment decision.

G99 and G100 are UK engineering recommendations that govern the connection of energy storage and generation equipment to the electricity distribution network. G99 applies to smaller installations below certain thresholds, while G100 covers larger systems. Obtaining the correct grid connection approval is a legal requirement for most BESS installations in the UK. JS Energy provides G99 and G100 grid application support as part of our installation service.

Battery energy storage systems require regular maintenance to ensure safe, efficient, and reliable operation. This typically includes preventative maintenance checks, HVAC and power protection system inspections, alarm testing, remote monitoring, and periodic system health assessments. JS Energy offers flexible BESS maintenance packages on a quarterly, half-yearly, or annual basis — tailored to your system and operational needs.

Yes. JS Energy offers full end-to-end project management for energy storage deployments — covering feasibility, procurement, supplier selection, contract negotiation, installation oversight, and ongoing maintenance. We act as your single point of contact throughout, reducing complexity and risk while keeping your project on track. If you only need support in specific areas, we also offer flexible fractional support targeted at the stages where you need us most.

The right BESS size depends on your energy consumption patterns, peak demand, available space, budget, and goals — whether that's reducing energy costs, improving resilience, or maximising use of on-site renewable generation. JS Energy's feasibility and business case analysis will assess your specific requirements and recommend the most appropriate system size and configuration. Get in touch to start the conversation.