Historically, fixed-price contracts have been the default choice for businesses seeking budget certainty. But the commodity price is only one part of an electricity bill. Network charges, system costs, taxes and levies can represent a substantial (and highly market- and site-specific) share of the total cost. Conventional fixed tariffs can also isolate businesses from wholesale price signals, meaning flexible sites may be unable to benefit from shifting consumption into lower-cost periods.
Navigating this environment requires a shift in perspective.
In this guide, produced by our energy finance specialists here at Wattstor, we explore the transition from passive energy procurement to active energy management, mapping out how next generation commercial energy tariffs like Price Protect, when carefully paired with onsite assets, can offer a more adaptable and potentially more cost-effective approach for energy-intensive businesses.
Fixed tariffs v dynamic tariffs
(or is a hybrid approach best?)
For years, fixed price contracts have been the standard choice and continue to be, offering procurement teams a predictable baseline for their annual budgets. However, as the energy grid modernises and wholesale markets fluctuate, the structural limitations of these traditional agreements are becoming more apparent.
Fixed tariffs penalise short term operational flexibility
While fixed contracts offer an undeniable sense of security, that stability often comes at the price of penalising energy efficiency and flexibility. Energy suppliers take on significant market risk to provide a flat rate over a 12 – 24 month period. To protect their own margins, they typically build a ‘hedging premium’ into the contract. This means businesses are often paying an invisible surcharge to insulate themselves from market volatility, essentially subsidising the supplier’s risk.
Fixed contracts are designed around predictable, static operations, for supplier revenue protection so they typically include strict usage-tolerance penalties. If a site’s energy consumption deviates from its historically agreed-upon volume (whether due to an unforeseen surge in production or a successful energy efficiency initiative) the business is dealt with unexpected financial penalties.
Rather than being rewarded for flexibility businesses are often penalised for it.
How Dynamic tariffs risk long term financial exposure
Instead of blending energy costs into a single, opaque flat rate, dynamic tariffs reflect the actual, real-time conditions of the energy market. Most importantly, they separate the commodity costs (the actual energy) from the non-commodity costs (grid delivery fees, taxes, and levies), itemising them on an hourly basis.
For energy-intensive industries, this level of transparency is a highly effective tool. It shifts a business from being a passive payer of bills to an active manager of its consumption.
However, purely dynamic tariffs are not a silver bullet. While they unlock significant savings when wholesale prices dip (or even drop below zero), they also expose the business to the opposite end of the spectrum: extreme wholesale market spikes that leave commercial energy budgets entirely exposed to the tumultuous open market.
Is a next generation ‘Hybrid’ Tariff best?
Hybrid tariffs act as a bridge between the predictability of fixed contracts and the agility of dynamic models. This model allows businesses to benefit from lower wholesale prices when they occur, without the fear of being exposed to extreme market spikes.
- Capitalising on the downside
If wholesale electricity prices fall, the business automatically benefits from a cheaper variable rate. Price Protect is structured so that this rate comes at a guaranteed discount to the market average, meaning whatever the market price is doing, the tariff remains lower. - Capping the risk
To solve the core issue of dynamic market exposure, the tariff includes a hard price cap. If a sudden energy crisis or severe grid constraint causes wholesale prices to spike, the business is completely protected and will never pay more than the agreed ceiling. - Consolidated billing
Unlike traditional Power Purchase Agreements (PPAs) that cover energy supplied solely from the installed renewable asset, this hybrid approach combines both grid electricity and onsite-generated electricity into a single, cohesive plan that covers 100% of the site’s load.
Unlocking full value with a battery storage asset
If a next generation tariff like Price Protect acts as the commercial contract guiding your energy strategy, a Battery Energy Storage System (BESS) serves as the essential asset.
Integrating onsite battery storage transforms your operation from passive consumption to active participation in the energy system. By decoupling your physical energy usage from real-time grid pricing, BESS enables organisations to actively bypass expensive non-commodity charges.
When a hybrid tariff is paired with storage, it unlocks two core operational strategies:
Load Shifting (changing when you buy power)
Rather than treating daily price volatility as an unavoidable operational cost, load shifting allows your business to actively exploit it. By decoupling your physical energy demand from peak network tariffs, you can systematically capture the arbitrage opportunity between expensive grid delivery fees and cheap wholesale dips.
- Strategic charging
The battery can be scheduled to charge during off-peak hours, overnight, or during periods of high renewable generation when wholesale prices drop. - Discharging on demand
During peak pricing windows, when grid delivery and congestion fees are typically at their highest, the facility temporarily ceases drawing from the grid and runs entirely on the stored battery power.
While load shifting requires careful modelling to accurately match a specific site’s consumption profile, it is a highly effective, practical way to drive down the average unit cost of energy over a billing cycle.
Peak Shaving (overcoming physical grid constraints)
While daily arbitrage protects margins, restricted grid capacity actively bottlenecks commercial growth. Expanding operations traditionally forces businesses to absorb the massive CAPEX and multi-year lead times of a DNO network upgrade. Peak shaving reframes this challenge, shifting grid capacity from a structural network dependency into a manageable internal asset play.
Peak shaving offers a behind-the-meter alternative. It uses the battery storage system to monitor site demand and instantly discharge power to smooth out sudden, intensive spikes in consumption.
- Avoiding breach penalties
By supplementing grid power with stored battery power during moments of high demand, the facility stays safely under its connection limit. - Bypassing Costly Upgrades
A practical example of this nuance in action is the Icknield Biogas project. Faced with a strict grid connection limit of less than 1 megawatt that threatened to stall their expansion, the site integrated a 2.4 MWh battery alongside a large solar array. This hardware solution allowed them to comfortably manage their heavy load requirement (150-200 kWh per hour) without breaching the local network limit or paying for a massive infrastructure overhaul.
Ultimately, combining a hybrid tariff like Price Protect with the physical agility of behind-the-meter storage enables heavy energy users to bypass regional grid congestion. Crucially, because these onsite energy systems can be fully funded, businesses can transform a structural network vulnerability into a sustainable commercial advantage without the burden of heavy capital expenditure.
Automating financial control via ai-powered EMS
While battery storage assets provide the physical capacity to bypass grid constraints, actively capturing that value across a complex commercial facility cannot just rely on human oversight. Expecting site managers to constantly monitor live wholesale pricing signals and manually trigger battery discharges introduces unnecessary operational friction. Realising the full financial yield of a dynamic strategy requires smart autonomous control.
EMS as the automated software engine
This is where an ai-powered Energy Management System (EMS) becomes critical. Operating as a fully autonomous virtual energy manager, Wattstor’s Podium EMS continuously ingests live market data, site demand forecasts, and battery capacity levels. This works when the system identifies an arbitrage opportunity or detects an approaching grid capacity limit, it executes the necessary load shifting and peak shaving protocols instantly – typically in under 200 milliseconds.
Simultaneous optimisation for the lowest unit cost
The commercial power of an ai-powered EMS lies in its ability to manage multiple complex variables concurrently. It goes far beyond simply monitoring a battery’s state of charge, for example:
- Dual optimisation
Podium goes beyond a standard EMS by integrating a proprietary optimisation layer and billing engine. This enables ‘dual optimisation,’ where the system simultaneously manages your dynamic energy contract and your physical onsite generation and storage assets to deliver the absolute lowest unit cost. - Real-time margin protection
By making calculated, split-second decisions on whether to draw from the grid, discharge the battery, or trade excess renewable energy, the EMS ensures that every kilowatt-hour consumed by the site is sourced at the lowest possible unit cost.
Mastering your new decentralised energy strategy
The financial control delivered by an advanced EMS does more than just protect daily margins. It connects your facility to a much larger structural shift in how power is managed. Commercial businesses have historically operated within a strictly fixed and centralised strategy, functioning simply as passive consumers reliant on external generation.
Today, that model is rapidly evolving into a decentralised reality.
In this environment, true operational resilience is local.
The objective for next generation energy management is no longer just buying energy efficiently, but actively participating in the broader energy system.
When a site relies exclusively on a standard grid connection, it remains exposed to the physical and financial bottlenecks of the wider network. Therefore by integrating smart management with onsite storage, you fundamentally change that dynamic. This strategy turns your facility into a physical buffer against grid instability rather than a victim of it. So when network congestion drives up delivery fees or local connection limits threaten your growth, your own assets absorb the impact. Giving you:
Next generation tariff flexibility
Deploying hybrid/dynamic tariffs like Price Protect to capture wholesale market dips automatically, backed by a hard price cap to eliminate market volatility risks.
Zero-CAPEX asset integration
Securing the physical Battery Energy Storage System (BESS) required to bypass regional grid delivery fees entirely through a fully funded, OPEX-friendly model.
Autonomous margin protection
Leveraging an intelligent EMS to automate real-time load shifting and peak shaving, protecting operational margins without adding friction to site teams.
Navigating this transition is a journey we take alongside our partners, ensuring every step is financially engineered to protect the balance sheet. This is the foundation of our Price Protect product. By pairing a ‘hybrid’ energy tariff with a fully funded onsite battery asset, we provide a complete, CAPEX-free framework. Aligning the physical hardware required to bypass grid constraints with the commercial contract needed to capture market upside, securing your long-term operational independence.
Conclusion
It’s clear that passive, fixed-rate, procurement leaves your bottom line exposed to escalating non-commodity charges and grid bottlenecks.
Combining hybrid ‘dynamic’ tariffs with fully funded battery storage and intelligent EMS control allows you to eliminate supplier risk premiums, sidestep peak network fees, and protect operational margins – with zero upfront CAPEX.
Book a Site Assessment & Price Modelling
We analyse your half-hourly load profile, model your peak shaving potential, and deliver a tailored financial roadmap demonstrating your net unit cost reduction.
Frequently Asked Questions
Fixed contracts feel safe, but unhedged dynamic tariffs sound volatile.
How does Price Protect solve both?”
Price Protect eliminates the “either/or” dilemma. Legacy fixed contracts force you to pay heavy supplier risk premiums and lock you into rigid volume tolerance clauses that penalise any change in production. Raw dynamic tariffs, on the other hand, leave your balance sheet exposed to wholesale market spikes. Price Protect combines the best of both: it operates dynamically to let you capture wholesale market dips, but enforces a hard contractual price cap. You gain the downside budget security of a fixed contract without sacrificing dynamic market upside and your battery asset automatically optimises the difference.
We are locked into an existing fixed-price contract.
Can we still start this process?”
Yes. Transitioning to a smart energy architecture can be a phased rollout, not a single contract switch. Wattstor can deploy the fully funded battery hardware and Podium EMS onto your site immediately under your current contract. The EMS will start shaving peak charges, mitigating DNO constraints, and building operational flexibility right away. By the time your existing fixed agreement expires, your facility is already optimised and ready to activate Price Protect without a single day of operational disruption.
If the battery storage is fully funded, how does the commercial model actually deliver ROI?
It moves energy infrastructure entirely off your balance sheet by pivoting from a high CAPEX outlay to an OPEX/Energy-as-a-Service model. Wattstor funds, installs, and maintains the renewable energy system. The physical battery provides the flexibility to store cheap power and discharge during expensive windows; Price Protect tariff provides the commercial framework to monetise that movement. The savings generated by the system cover the service, leaving your capital free for core business expansion while immediately lowering your net unit energy costs.
Will an automated EMS making split-second decisions risk disrupting core site production?
No. Production continuity is the non-negotiable baseline. Podium EMS operates strictly within the hard operational parameters set by your engineering and site managers. It automates the financial execution (seamlessly toggling between grid power, battery discharge, and onsite solar) in under 200 milliseconds, with zero drop in power quality or impact on power. Your site teams focus entirely on manufacturing while the software works silently to protect margins.
How do non-commodity network fees work under Price Protect compared to standard tariffs?
Standard fixed tariffs bundle non-commodity costs (like DUoS and TNUoS grid fees) into a single flat unit rate, meaning you pay a premium for grid delivery every hour of the day. Price Protect unbundles these charges. When paired with Behind-the-Meter battery storage, the EMS detects peak network fee windows in real time and automatically switches your site to battery power. Instead of paying a supplier to socialise expensive grid delivery fees, you simply sidestep them altogether.
Know someone who'd be interested in this? Why not share it: