Electrified compressors, separations and utilities can behave more like power brokers whose price refreshes every hour. Plants running through a price spike are paying for steady-state continuous operation they may not need. As we consider how to save energy, we must consider operational flexibility itself as an energy asset. For your operations, do you know which loads can move by minutes or hours, what that movement is worth under your energy tariff and when product commitments, catalyst constraints or safety margins erase the benefit before it reaches the ledger?

Emerging Electron Exposure

Industry is responsible for 37% of global final energy consumption, and the International Energy Agency’s (IEA) 2025 Energy Efficiency Policy Toolkit highlights digital innovation and energy management as system-wide efficiency tools (IEA, 2025). As electrification advances, more of a plant's energy balance lands on power markets that clear day-ahead in hourly products and intraday in 15-minute products. When fully connected to the grid, exposure to that volatility is not optional, and it’s why you need to assess the value of flexibility.

The Modern ‘Flex’

The adoption of flexible operation shifts a controllable electrical or thermal duty in time while respecting material balances, equipment dynamics, product quality, inventory and delivery obligations. Common process targets for flexible operation include retimed batch starts and cleaning cycles, drying and milling campaigns, refrigeration precooling, electrolysis load and noncritical utilities. Intermediate tanks, product inventory, thermal batteries and spare train capacity also can act as buffers that decouple production from the grid clock.

Your plan control architecture matters as much, if not more, than hardware. In simulated air-separation units, recent studies have integrated day-ahead scheduling with an intraday economic model and a predictive control layer. "This resulted in a 5% cost savings compared with stationary operation, versus 1% for scheduling alone and 2.5% for the controller alone. (Schulze et al., 2025). Arbitrage between the two markets generated a bulk of the added benefit, and the combined scheme held its savings across shifting price scenarios, whereas the standalone controller swung between a 10% gain and a 1% loss. Granted, these are study-specific from one plant model and European price profiles, so of course, your mileage (modeling) may vary.

We tend to rearrange operating practices around existing assets. This is why air separation, chlor-alkali and electrolysis with their high electrical intensity, storable products and ramp rates are often targets for flexible scheduling. Whichever process you decide to adjust, you will need automation expertise. For example, with an air separation unit, a day-ahead optimizer tool will recommend a trajectory, the intraday controller will refine it, but the regulatory layer, interlocks, relief systems and operator authority will remain untouched and independent. Today, "the optimizer decides" is not an acceptable operating philosophy, and no tariff benefit justifies blurring that separation.

The Flexible Value

In general, flexibility delivers key value streams in the form of avoided demand charges, energy price arbitrage and paid grid services. Berkeley Lab reviewed 148 demand-flexibility programs and 93 rates to show how much they depend on tariff structure, event design, baseline rules and measured performance (Murphy et al., 2024). We are moving into a paradigm of integrated process, power and profit, where the domains in the study belong in the engineering analysis, not the accounting books.

Other studies identified grid reliability and industrial cost savings as flexibility drivers and the barriers to adoption as uncertain revenues, investment costs, lost production and implementation complexity (Bielefeld et al., 2023). Plants with tight delivery obligations, short catalyst life sensitive to transients, or long minimum run lengths should tread carefully.

Flexibility compounds with Energy Saver levers previously discussed in this series of columns. Thermal storage converts fixed heat loads into schedulable ones, widening the flexibility map. The digital transformation and advanced control topics covered previously are prerequisites here since a plant that cannot model its own closed-loop dynamics cannot schedule them. Heat integration changes the picture too: Once pinch-driven recovery reshapes the utility balance, the set of loads worth shifting changes with it.

A Flexible Plan

If you’re just getting started with a flexible energy plan, start by mapping the process before investing in software. For each major load, document the minimum and maximum rate, ramp time, minimum run time, allowable interruption, recovery time, buffer capacity, binding quality constraint and the accountable process owner. Pull your actual tariff and baseline documents into that analysis. Consider running a shadow schedule, a trial period on the order of four to eight weeks, and calculate what the plant could have earned or avoided without changing operations. Reconcile the result against production penalties, inventory limits, forecast error and maintenance reality. If the shadow numbers are promising, take the next steps to invest more engineering hours, planning and/or bidding into a grid program.