Put a battery behind your solar or wind plant and sell what the export limit would curtail: stored at midday, delivered at the peak, with your existing PPC still in charge of the connection point.
Example site: A solar or wind plant adding a battery at its connection point. What happens there
A solar or wind plant adding a battery at its connection point
The plant is sanctioned to export up to a fixed value, and its own power plant controller (PPC) holds it there. On a good day the plant can make more than that, and the excess is curtailed. Its output also rises and falls with cloud and wind, while the buyer wants a steady profile.
Less energy curtailed, more delivered in the hours it is worth most, and the schedule held with the PPC still in charge.
Connect the battery at the plant and give it an EMS that works with the power plant controller you already have. The PPC keeps the export limit and grid compliance at the point of interconnection; the EMS decides when the battery stores and when it delivers, so energy above the limit is stored instead of curtailed, delivered in the peak or into the schedule, and cycled inside the warranty. Ingro EMS-RE does this and records every instruction, deviation and battery-health figure for the offtaker and the lender.
The plant already has a PPC the grid operator has accepted, and nobody wants to reopen that approval. But the array or the turbines can make more than the connection allows, energy is curtailed on the best days, the evening has no generation to sell, and deviation from schedule costs more each year. A battery is being added, or bid, to fix that, and it needs a controller that runs it well without disturbing what already works at the point of interconnection.
Written for
Developers, IPPs, EPC contractors and asset managers of utility, hybrid, open-access and captive solar and wind plants adding co-located storage, or bidding firm and round-the-clock renewable tenders
What it costs you today
When output exceeds the sanctioned export, or the operator instructs a reduction, the plant is held back and the energy is lost. It happens on exactly the days the plant was built for.
Solar output ends before the evening peak, and wind follows the weather rather than demand. The hours worth most are the ones the plant cannot serve on its own.
For wind and solar sellers, deviation is moving in phases from an available-capacity basis to a schedule basis, and the tolerance bands are narrowing. Ramping, returns from curtailment and late revisions now cost more than they used to.
The PPC already holds the point of interconnection. A battery controller added without a clear split of control can push the plant over its limit or hold back output the PPC was counting on, and reopening the PPC's grid approval is the last thing anyone wants.
Ingro EMS-RE is an energy management system for battery storage co-located with a solar or wind plant. It decides when the battery charges and discharges: storing energy the plant would otherwise curtail, delivering it in the hours it is worth most and holding the plant to its schedule. It works with the plant's existing power plant controller (PPC) and does not replace it.
The PPC stays in charge of the inverters and of grid compliance at the connection point. Ingro EMS-RE runs the battery behind it: charging when export is capped or energy is cheap, discharging into the evening peak or a committed schedule, smoothing ramps, and keeping cycling inside the limits that protect the warranty. How control is split with the PPC is agreed at design for each plant.
Ingro EMS is a made-in-India energy management system, designed, built and supported in India. It is supplied to BESS integrators, EPC contractors and developers to go inside the battery systems they build, and to replace a locked or underperforming controller on an existing one. Or Ingro delivers the whole system, from sizing to O&M.
We do not replace the plant controller you already have. The PPC keeps the connection point; Ingro EMS-RE runs the battery behind it.
Ingro EMS-RE reads every meter and talks to the systems that make, store, use and switch energy on the site, then runs them to one plan on every control cycle. The battery is one of the things it controls.
The plant's own PPC holds export to the limit at the connection point, as it does today. Ingro EMS-RE runs the battery behind it: what the limit would spill is stored, and delivered when the plant has room again or when the schedule asks for it.
Storing what would be curtailed
Illustrative. Not measured data.
Around midday the plant could make more than the limit allows. The battery stores that slice instead of it being curtailed, and delivers it in the evening peak, inside the same limit.
The same day with no battery. The PPC holds export at the limit, which is its job, and everything the plant could have made above it is curtailed and never sold.
A wind plant committed to a steady delivery profile. When the wind is above the schedule the battery stores the difference; when it drops below, the battery makes it up, so the plant holds its schedule and deviations shrink.
Energy the plant would otherwise curtail above its export limit stored in the battery instead of lost.
Stored energy delivered in the peak hours or into the committed schedule, where each unit is worth most.
Output firmed and ramps smoothed, so the plant holds its schedule through cloud and wind variation and deviations shrink.
Battery cycled inside its warranty limits, with state of health, availability and cycles reported monthly for lenders.
Each lever EMS-RE pulls lands somewhere you can check, on a bill line, in a log or in a monthly report. No figure here is a promise: the application book works them in your own tariff and duty.
Energy the plant would have had to hold back is stored and delivered when there is room at the connection, so the same array or turbines sell more units.
Where you see itEnergy stored during limits and instructions, and energy later delivered, in the monthly energy ledger, reconciled to the main meter
Stored energy is delivered when it is worth most: the evening peak, a contracted round-the-clock profile, or a higher-priced block.
Where you see itBlock-wise export split by source, plant direct and battery, set against the schedule or the price for each block
Ramps smoothed and gaps filled from the battery mean the plant follows its schedule more closely, which matters more as the deviation basis moves towards schedule.
Where you see itBlock-wise deviation in the plant's own record, reconciled to the deviation settlement account the SLDC or RPC issues
Throughput, state-of-charge window and depth of discharge are held inside the warranty envelope and recorded, so a fade claim cannot be rejected as misuse.
Where you see itCycle record and SoC history set against the warranty terms in the storage health and warranty report
Asset manager / IPP head
More units sold from the same plant, with the battery's contribution shown separately from the plant's.
Grid compliance / EPC electrical lead
The PPC's accepted settings and models left alone, and a clear, tested split of control at the point of interconnection.
CFO / Finance
Stored, delivered, curtailed and deviation figures that reconcile with the meter and the settlement accounts.
Lender's independent engineer
Battery availability, cycles and state of health with their data basis, against the warranty and the financial model.
Put these to every supplier on the shortlist, us included. A supplier that can't answer one in writing is telling you something.
These are the lines that end up in the specification for EMS-RE. Ask every supplier to answer each one in writing. Read the common questions.
Two controllers acting on the same point without a defined split either fight each other or leave a gap, and the plant pays in trips or deviation.
Reopening an accepted technical-data submission can delay the battery's commissioning and put the plant's own approval back under review.
Energy is only saved if the battery takes it as it arises; a slow loop leaves the PPC to curtail it first.
Breaking the warranty voids the fade cover the lender relies on, and a schedule met by overcycling costs more than it earns.
Without that record the battery's contribution cannot be separated from the plant's, and neither the offtaker nor the lender will accept the figures.
The regulations require control networks isolated from IT and the internet and restrict where remote operation may come from, which rules out some vendor support models.
11 questions
It decides when the battery charges and discharges. The EMS reads the plant's output, the export limit, the schedule and the battery's own limits on every cycle, then stores energy that would otherwise be curtailed, delivers it in the hours it is worth most, and smooths the plant's output so it holds its schedule.
Yes. The battery is connected alongside the existing plant, and Ingro EMS-RE is integrated with the PPC and SCADA already there over the interfaces they support, such as Modbus TCP, IEC 61850, DNP3 or OPC-UA. Compatibility is confirmed against your equipment list during discovery.
Yes. The EMS works from the plant's metered output, its export limit and its schedule, so the same controller runs storage at a solar park, a wind farm or a hybrid of the two.
Storage health and warranty, availability and cycles, and deviations against the schedule, issued monthly for owners and lenders. Where the plant's generation data is shared with the EMS, the Solar Generation Performance report (structured to IEC 61724-1) is issued alongside.
Sometimes, and if it schedules the battery against price, schedule and warranty as well as limits, that can be enough. Compare suppliers on what the battery does all day, what it stores, when it delivers, how it protects the warranty and what it records, not only on whether it can follow a setpoint.
Possibly not for curtailment alone. The case then rests on delivering in higher-value hours, meeting a firm or round-the-clock profile, and reducing deviation; if none of those apply to your offtake, the honest answer is a smaller battery or none yet. That is what the discovery data is for.
No. The plant's PPC keeps control of the inverters, the export limit and grid-code compliance at the connection point. Ingro EMS-RE runs the co-located battery and works with the PPC. The split of control is agreed at design for each plant: the EMS can follow battery setpoints from the PPC, or schedule the battery and give the PPC its available power.
Yes. Those are renewable plants with storage that must deliver to a committed profile, and the battery is scheduled against that profile with every deviation recorded. Requirements differ by tender and by agreement, so we scope against the document itself.
EMS-GS is for standalone storage at a substation, where Ingro EMS-GS is the plant controller. EMS-RE is for storage that shares a connection with a solar or wind plant, where the plant's own PPC stays in charge and the EMS runs the battery.
No. The PPC stays in charge of the inverters, the export limit and grid compliance at the point of interconnection. Ingro EMS-RE runs the battery and works with it; how control is split between the two is agreed at design, against your PPC's interfaces and your connection agreement.
The forecast sets the schedule, but the plant still has to follow it. A battery fills gaps when output falls short and absorbs the surplus when it runs over, so the delivered profile stays closer to the schedule. You still choose who forecasts; the EMS records each block's schedule, delivery and deviation.
Still have a question?
Send us your site, hardware and tariff or tender, and an engineer will answer it.
Go deeper
Adding storage to a renewable plant.
How a tender document maps onto the EMS scope.
Scheduling and compliance for open-access plants.
Putting Ingro EMS inside the system you build.
The controller is half of it. The other half is the engineering that puts it on your site and keeps it right afterwards. Both are quoted as one item.
The product
1. The controller
Wired, configured and commissioned against your plant, and installed in the plant room. It is the component that operates the site.
2. The operator console
A single-line representation of the actual plant with live power on every feeder, the state of each source, the alarm register, and the endurance available at the load currently being carried.
3. The mobile view
Read-only, for management rather than operations: whether the site is sound, what it has saved, what has occurred and what is scheduled.
4. Reporting and training
The reporting suite, generated and distributed automatically, and instruction for the personnel who will operate the plant.
The service
The platform in full: specifications, the thirteen reports and implementation
Nothing bought yet? Better still: we write the equipment schedule so EMS-RE gets the data it needs from day one.
Missing one? It goes into the equipment schedule before anything is ordered, not discovered at commissioning.
Send us the items in what to send. We return a scope of supply, an equipment schedule and an indicative programme for EMS-RE, written against the outcomes you set.