Group Energy BuyingMulti-Site Energy Procurement for Organisations with 25+ Sites
What Is Group Energy Buying?
Group energy buying is a specialist form of business energy procurement designed for organisations with 25 or more sites, or those managing complex mixed electricity and gas portfolios across multiple locations. Rather than renewing each individual site contract separately — a process that is time-consuming, administratively burdensome, and commercially inefficient — group buying consolidates your entire estate into a single managed portfolio, giving you far greater leverage with suppliers and significantly reducing the total cost of your energy.
At Catalyst Commercial Energy, our Group Energy Buying service is managed by a dedicated National Accounts Team with extensive experience in multi-site procurement. We act as your independent energy broker, tendering your portfolio across our comprehensive panel of UK energy suppliers, running detailed financial comparisons, and advising you on the most suitable contract structure for your specific operational needs. Whether you require a straightforward fixed-price arrangement, a fully flexible risk-managed strategy, or access to our shared energy buying baskets, we will design a solution around you.
Who Is Group Energy Buying For?
Group energy buying is the right solution for any UK organisation that:
> Operates 25 or more metered sites (electricity, gas, or both)
> Has a complex or mixed portfolio of half-hourly and non-half-hourly meters
> Currently manages renewals site by site and wants to streamline the process
> Is an estate-heavy business in retail, hospitality, care, leisure, or manufacturing
> Has a large energy spend and needs professional independent procurement support
> Is opening or closing sites regularly and needs a flexible management framework
> Wants a single point of contact across the entire estate rather than dealing with multiple suppliers
We work with organisations across a wide range of sectors, including national retailers, hotel groups, restaurant chains, care home operators, NHS trusts, housing associations, leisure centres, and multi-site manufacturing businesses. If your portfolio is large enough and complex enough to benefit from specialist management, our National Accounts Team is equipped to handle it.
The Key Benefits of Group Energy Buying
Consolidating your energy procurement through Catalyst delivers a range of measurable commercial benefits:
Lower Unit Rates Through Portfolio Volume
When you present a single, consolidated portfolio to the wholesale market, suppliers compete for a significantly larger volume of energy than they would for individual site contracts. This buying power translates directly into more competitive unit rates and standing charges across your estate — savings that are simply not achievable when renewing sites individually.
Reduced Internal Administration
Managing energy across dozens or hundreds of sites individually creates an enormous administrative burden — multiple renewal dates, multiple supplier relationships, multiple invoices to validate. Our group buying service consolidates this into a single managed process with a single account management team, freeing your internal resource to focus on your core business.
Independent Market Access
Catalyst is entirely independent. We are not tied to any energy supplier, and we have no commercial incentive to steer you towards any particular contract. When we tender your portfolio, we approach every relevant supplier in the market and present the results transparently, so you can make an informed decision based on financial comparison rather than supplier preference.
Risk Management Across the Portfolio
With a large portfolio, the risk of energy market volatility is amplified. Our team provides ongoing tariff analysis and budget forecasts, so you always have a clear view of your forward energy costs and can make strategic purchasing decisions at the right time — rather than being forced to renew in a difficult market because individual contract end dates have crept up on you.
Simplified Supplier Relationships
Instead of maintaining relationships with multiple energy suppliers across your estate, group buying allows you to consolidate to a smaller number of supplier relationships — or in many cases a single supplier — with Catalyst acting as the intermediary to manage those relationships on your behalf.
How Our Group Energy Buying Process Works
Our end-to-end managed service covers every stage of the procurement cycle:
Step 1: Portfolio Analysis
We begin with a full audit of your existing energy estate — reviewing all current contracts, meter types, consumption data, renewal dates, and non-commodity costs (including DUoS, TNUoS, Capacity Market charges, and the Climate Change Levy). This gives us a complete baseline for comparison and ensures we go to market with accurate data.
Step 2: Market Tender
Using our established relationships across a comprehensive panel of UK energy suppliers, we tender your full portfolio and obtain a range of competitive quotes. We structure the tender to maximise competitive tension between suppliers, ensuring you receive the best possible pricing rather than a standard list price offer.
Step 3: Financial Comparison and Recommendation
Every quote we receive is subjected to a rigorous financial analysis. We present you with a detailed comparison report that shows your current costs versus each supplier option, broken down by site and by commodity. Our recommendation clearly sets out which offer delivers the best total commercial outcome for your business — not just the headline unit rate, but the full cost including all non-commodity elements.
Step 4: Contract Execution
Once you have selected your preferred option, we manage the entire contract execution process — coordinating with the supplier, your internal teams, and any relevant third parties such as Meter Operators or Data Collectors to ensure a smooth transition with no risk of supply gaps or out-of-contract pricing.
Step 5: Ongoing Account Management
Our service does not end at contract signature. Your dedicated National Accounts Manager remains available throughout the life of your contract to handle new site additions, site closures, account queries, invoice validation, meter reading management, and portfolio reviews. We also begin monitoring market conditions ahead of your next renewal window, so you are never caught out by an unfavourable market at the wrong time.
Contract Structures Available
Group energy buying is not a one-size-fits-all product. We offer a range of contract structures tailored to the needs of different organisations:
Fixed Price Group Contracts
A fixed price contract sets a known unit rate for electricity and/or gas for the duration of the term — typically 12, 24, or 36 months. This provides complete budget certainty, which is particularly valuable for organisations with tight cost control requirements or where energy is a significant proportion of operating costs. Fixed contracts are straightforward to administer and easy to communicate internally.
Flexible Risk-Managed Contracts
For organisations with a sufficiently large energy spend, flexible procurement allows you to access the wholesale energy market directly, making multiple purchasing decisions throughout the contract term rather than fixing a single price at a single point in time. This can deliver significant cost reductions when market conditions are favourable, but does require a greater degree of active management. Our team provides the market intelligence and purchasing guidance to manage this risk effectively on your behalf.
Basket and Consortium Arrangements
If your portfolio does not meet the threshold for fully flexible procurement, or if you want to combine the benefits of collective buying with those of flexible pricing, our basket arrangements allow you to join a group of businesses purchasing energy together. This amplifies your collective buying power and can deliver wholesale market access at a lower individual spend threshold. We operate both electricity buying baskets and gas buying baskets — speak to our team to find out which basket may suit your profile and when the next purchase window is open.
Bureau Services: Invoice Validation and Bill Management
For large multi-site organisations, energy billing errors are surprisingly common — and individually they can be small enough to go unnoticed, but collectively they can represent a significant financial leakage over the course of a contract. Our Bureau Services provide a professional layer of invoice management on top of your procurement arrangement:
> Bill Validation — Every invoice is checked against your contracted rates, meter reads, and consumption data before you pay it. Errors, estimated reads, and overcharges are identified and disputed on your behalf.
> Account Reconciliation — We maintain a reconciled ledger of your energy accounts, ensuring every site is correctly billed and any credit balances are recovered promptly.
> Meter Reading Management — We coordinate the submission of accurate meter reads across your estate to minimise estimated billing and the reconciliation issues that follow from it.
> Non-Commodity Cost Analysis — Distribution charges, transmission charges, Capacity Market levies, and the Climate Change Levy are all reviewed to ensure they have been correctly applied to your invoices.
> Automated Meter Reading Solutions — Where appropriate, we can advise on and coordinate the installation of AMR (Automated Meter Reading) equipment to remove manual read requirements entirely.
Reporting and Portfolio Visibility
One of the most significant operational benefits of a managed group buying service is the reporting and analytics capability it provides. Rather than chasing individual invoices and piecing together your energy spend manually, our clients receive consolidated portfolio reporting that gives complete visibility of energy costs across all sites.
This includes:
> Site-by-site consumption and cost breakdowns
> Tariff analysis and budget forecasting for the year ahead
> Contract expiry monitoring across the entire estate
> Quarterly portfolio reviews with your account manager
> Market intelligence updates and forward pricing guidance
> Carbon reporting data to support your SECR and net zero obligations
This level of oversight enables finance directors, operations managers, and sustainability leads within your organisation to make better-informed decisions about energy spend, capital investment in efficiency measures, and carbon reduction planning.
Managing a Growing or Changing Estate
One of the most challenging aspects of energy management for large organisations is dealing with a portfolio that changes constantly — new sites opening, old ones closing, leases transferring, and meter configurations changing. Our National Accounts Team is experienced in managing this complexity on your behalf:
> New Site Additions — When you open a new location, we handle the energy setup and ensure the new supply is incorporated into your portfolio on the best available terms.
> Site Closures — We manage the supply disconnection or transfer process to ensure you are not left paying for energy on a site you no longer occupy.
> Change of Tenancy — For leased properties, we handle the COT (Change of Tenancy) process with suppliers, minimising liability and ensuring a clean handover.
> Acquisitions and Disposals — If your estate changes due to a merger, acquisition, or disposal, we can rapidly assess the energy implications and incorporate new sites or remove disposed ones from your portfolio management framework.
Industries We Serve
Our Group Energy Buying service is trusted by organisations across a broad range of industries. Any sector with a multi-site estate stands to benefit, including:
> Retail — National and regional retail chains with stores, distribution centres, and warehouses
> Hospitality and Leisure — Hotel groups, restaurant chains, pubs, health clubs, and entertainment venues
> Healthcare and Social Care — NHS trusts, private hospitals, care homes, and supported living providers
> Education — Multi-academy trusts, universities, college groups, and independent school networks
> Manufacturing and Industrial — Multi-site manufacturers with high energy intensity and complex meter profiles
> Property and Facilities Management — Commercial landlords, managing agents, and facilities management companies managing energy for multiple tenants or managed properties
> Housing Associations and Local Authorities — Public sector bodies with large estates and a need for transparent, auditable procurement processes
Why Choose Catalyst for Group Energy Buying?
There are many energy brokers and consultants in the UK market, but relatively few with the capability and experience to manage a truly large multi-site portfolio. Catalyst Commercial Energy brings several important differentiators to group energy buying:
> 100% Independent — We are not owned by, affiliated with, or commercially tied to any energy supplier. Our only obligation is to you.
> Dedicated National Accounts Team — You will not be passed around a call centre. You will have a named account manager who knows your portfolio in detail.
> Comprehensive Supplier Panel — We tender across the full range of relevant UK suppliers, not a restricted panel, ensuring genuine market competition.
> End-to-End Service — From initial portfolio audit through to ongoing bureau services and renewals management, we provide a fully managed solution, not just a transactional brokering service.
> Transparent Reporting — We provide full visibility of our recommendations, the alternatives we considered, and the basis on which our advice is given. You will always know exactly what you are paying and why.
Frequently Asked Questions
What is group energy buying?
Group energy buying (also called collective energy purchasing or multi-site procurement) combines the energy requirements of multiple sites into a single managed portfolio. This allows an organisation to approach the market as a single large buyer, achieving better rates than would be possible by renewing each site individually, and significantly reducing the internal administrative effort required to manage a large estate.
How many sites do I need to qualify?
Our group energy buying service is designed for organisations with 25 or more sites. However, if you have fewer sites but a high total energy spend, or a particularly complex portfolio, we would encourage you to speak to our team — we may still be able to offer a managed portfolio service that suits your needs. For organisations with fewer than 25 sites who still want collective buying benefits, our basket purchasing arrangements may be a suitable alternative.
How does group energy buying reduce my energy costs?
Cost reductions come from several sources. First, volume: a single consolidated tender representing dozens of sites attracts more competitive pricing from suppliers than individual site renewals would. Second, timing: with a managed portfolio we can monitor your renewal windows and approach the market when conditions are favourable rather than when a deadline forces you to act. Third, efficiency: our bureau services identify and recover overbilling and errors that would otherwise go unnoticed. The combination of these factors typically delivers a meaningful reduction in total energy cost compared to unmanaged renewal.
Can I join a basket arrangement with other businesses?
Yes. If your portfolio does not qualify for individual group buying, or if you want to combine the benefits of collective purchasing with flexible pricing, we operate both electricity and gas buying baskets that allow multiple businesses to pool their buying power. Basket purchase windows open periodically — contact our team to find out when the next window is available and whether your profile is a good fit.
What happens when I open or close a site?
This is handled by your dedicated National Accounts Manager. For new sites, we ensure energy supply is set up correctly and incorporated into your portfolio on the best available terms. For closures, we manage the supply disconnection or transfer process to protect you from ongoing liability. We aim to make estate changes as seamless as possible so they do not create administrative burden for your team.
What is included in the bureau service?
Our bureau service covers bill validation (checking every invoice against contracted rates and actual consumption), account reconciliation, meter reading management, non-commodity cost analysis, and dispute resolution with suppliers on your behalf. It is designed to ensure that every pound you are billed for energy is correctly owed — and that any errors are identified and recovered before they accumulate.
Do you offer flexible energy purchasing for large portfolios?
Yes. For organisations with a sufficiently large total energy spend, fully flexible procurement allows access to the wholesale market with multiple purchasing decisions over the contract term. This can deliver significant savings versus a fixed price contract when market conditions are right, but requires professional management to mitigate the associated risks. Our team provides the market monitoring, analysis, and purchasing guidance to run a flexible strategy effectively. We can also advise on hybrid approaches that blend fixed and flexible elements.
What ongoing support is included?
Your National Accounts Team provides a dedicated daily service covering supplier tendering, invoice validation, non-commodity cost analysis, meter reading management, and quarterly portfolio reviews. You also have access to consolidated reporting and analytics tools giving you complete visibility of energy costs across all sites. We also begin monitoring market conditions well ahead of your next renewal window to ensure you are never caught in an unfavourable position.
To find out how our Group Energy Buying service can benefit your organisation, contact our National Accounts Team today for an initial consultation and portfolio review.