A battery energy storage system (BESS) stores electricity generated by solar panels and releases it when needed. It helps shift energy from daytime generation to evening demand, supports peak-load management and can provide backup power when designed for that purpose.
As India expands its renewable energy capacity, battery energy storage systems are becoming increasingly important for managing solar power generation and electricity demand. Battery energy storage systems with solar are one such development that is proving to be an important response to the intermittency of solar energy. Solar panels only generate electricity for a limited time during the day – using battery storage can enhance this technology and create an integrated energy system with the potential of round-the-clock power delivery.
India's growing renewable energy capacity is increasing the need for reliable, flexible power storage. Solar-plus-BESS solutions are gaining importance for several reasons:
Renewable Integration: Stores excess solar and wind energy for use when generation is low.
Peak-Demand Management: Helps meet peak electricity demand and reduce grid stress.
Grid Flexibility: Balances fluctuations in power generation and consumption.
Firm & Dispatchable Renewable Energy: Supports round-the-clock and scheduled renewable power supply.
Storage-Backed Tenders: Government initiatives and renewable energy tenders increasingly incorporate battery storage requirements.
Industrial Power Needs: Helps industries manage electricity costs, peak loads and power reliability.
As India expands its renewable energy capacity, BESS is becoming essential to making clean power more reliable, flexible and available when needed.
There are a number of forces converging to spur rapid adoption of solar plus storage solutions. Grid operators across the world are under growing pressure to integrate ever larger shares of renewable energy while maintaining system reliability. While conventional solar projects are good for the environment, issues arise surrounding operations when the demand for energy is at its peak and the generation is not. The solar battery energy storage systems can "smooth out" that mismatch by storing the excess energy generated during times of high generation, and have it available during times of high demand.
There are also market forces at play driving the growth of renewable energy storage systems. The cost of batteries has declined significantly over the last ten years, bringing renewable energy storage solutions to a cost effective price point for utilities, businesses, and increasingly, residential use. Extreme weather events, and aging grids, have also raised awareness and concern around energy security, and prompted organizations to invest in reliable energy systems.
The first solar installations were focused around grid-connected systems with no energy storage capabilities. These systems would export excess energy to the grid when sunlight was available and only existed to supply to the grid - there is no backup possibility when there is no sunlight or outages. The next advancement in solar technology is a solar plus battery backup system. It represents an actual advancement in solar technology (and provide energy independence and backup capacity). With this advancement, industries that rely on an uninterruptible power supply and areas with potentially unreliable grids, can be served with energy.
Many manufacturing units are now integrating solar plus storage directly into their captive power plant for industries strategy to reduce grid dependency and stabilize long-term energy costs.
A solar-plus-storage system combines solar generation, battery storage and power conversion to manage when electricity is used.
Solar Generation: PV panels convert sunlight into DC electricity.
Battery Charging: Available solar electricity charges the battery through the system’s AC- or DC-coupled conversion arrangement. Grid charging may also be possible where the equipment and applicable rules permit.
Energy Storage: The battery stores energy within its operating limits, while the battery management system monitors cell conditions.
Battery Discharge: Stored energy supplies connected loads or the grid through the power conversion system.
Energy Management: The EMS coordinates charging and discharging according to demand, tariffs, available generation and any reserved backup capacity.
Backup during grid outages requires suitable islanding controls, protection and switching arrangements. Available runtime depends on usable stored energy and the connected load.
|
Component |
Function |
|
Solar PV |
Generates electricity from sunlight. |
|
Battery Racks |
Store excess solar energy. |
|
Battery Management System (BMS) |
Monitors battery health, safety and performance. |
|
Power Conversion System (PCS) |
Converts power between AC and DC. |
|
Energy Management System (EMS) |
Controls energy flow and usage. |
|
Protection & Thermal Management |
Prevents electrical faults and maintains safe operating temperatures. |
MW (Megawatt): Measures the power a battery can charge or discharge at a given time.
MWh (Megawatt-hour): Measures the total energy a battery can store.
Example: A 10 MW / 20 MWh BESS can discharge at its rated power for approximately 2 hours, before accounting for operating limitations and energy losses.
Simply put: MW tells you how fast energy can be delivered; MWh tells you how much energy is available.
The electricity generated from solar panels is produced during daylight, which is used simultaneously for the load consumption and charging batteries. If the generation is greater than consumption, the excess is sent to the batteries for later use, instead of being curtailed or sold at low prices. When the sun goes down, or during times of less solar generation, the batteries will discharge to provide continuous power to the load consumption.
Very complex energy management algorithms control the optimal charge and discharge mode of operation based on factors like energy rates, weather, historic consumption, and the grid conditions in real-time. This intelligent flow maximizes the benefits of solar battery technology for lowering energy costs to the consumer, improving the stability of the grid by preventing excess generation from adding stress to the grid, and having available power available continuously.
Grid-scale Battery Energy Storage Systems (BESS) help balance electricity supply and demand, improve grid stability and make renewable energy more reliable.
Frequency Response: Quickly balances supply and demand to maintain grid frequency.
Peak Shaving: Discharges stored energy during peak demand to reduce grid load.
Renewable Energy Shifting: Stores excess solar and wind energy for use when generation is low.
Ramp Management: Smooths sudden fluctuations in renewable energy generation and electricity demand.
Grid Support: Provides backup power, voltage support and improved grid reliability.
The combination of Battery Energy Storage Systems provides substantial value beyond the advantages to a single facility. As renewables penetrate power networks worldwide, the role of BESS in grid stability becomes even more important.
Electric grids must keep an exact equilibrium between generation and consumption at all times. Conventional fossil fuel plants could increase or decrease production based on demand curve shifts, and solar energy storage systems for reliability provide similar flexibility in renewable-heavy grids by absorbing generation when demand is low and injecting stored power when demand is high. This reliability capacity also contributes to grid stability and defers the cost of high demand peaker plants.
Power outages resulting from warming climate will have a huge cost to communities and businesses. The addition of solar battery energy storage systems to the grid that can mitigate power outages with supply backup power and lower outage risk with peak shaving/generation support services could substantially increase grid resiliency. This improvement in resiliency could be tremendous in critical load points like hospitals, data centers, and factories.
The advantages of implementing solar plus storage solutions extend across economic, operational, and environmental dimensions, creating compelling value propositions for diverse stakeholders.
Industrial processes need constant high quality energy. Solar battery storage gives industries a buffer against grid interruptions, as well as voltage swings and scheduled shutdowns. Manufacturers can operate continuously, avoiding disruption costs and avoiding damage to sensitive equipment subject to power quality issues. Reliability is a direct contributor to better operational efficiency.
The economic advantages are the main motivation for the installation of solar plus battery backup systems. Organizations save on their electricity bills by:
Reducing peak demand charges by feeding stored energy into the grid during times of high rates
Reducing time-of-use rates by charging solar batteries during times of low rates and discharging during times of high rates
Reducing demand charges through peak shaving
Offsetting or reducing diesel generator usage costs
In addition to the up-front savings, energy independence protects organizations from changing prices in energy and availability of energy and provides longer-term predictability in budgeting.
Renewable energy storage solutions allow for greater penetration of solar energy and wind energy on the grid. By addressing the issue of intermittency, storage systems provide utilities and grid operators with the ability to easily add renewable energy generation capacity without sacrificing reliability. This supports faster adoption of clean and renewable energy while providing value to energy transition efforts.
Industrial applications of solar battery energy storage systems span numerous sectors, each with unique requirements and value propositions.
Different industries use solar-plus-storage systems to manage peak demand, reduce electricity costs and ensure reliable power supply.
|
Industry |
Storage Needs |
|
Steel |
Supports high power demand, peak load management and operational continuity. |
|
Textiles |
Reduces peak-hour electricity costs and supports uninterrupted production. |
|
Chemicals |
Provides reliable power for continuous processes and critical equipment. |
|
Data Centres |
Ensures backup power, uptime and uninterrupted operations. |
|
Cold Storage |
Maintains refrigeration during outages and prevents inventory losses. |
|
Manufacturing |
Balances fluctuating loads, reduces demand charges and improves power reliability. |
Solar plus storage solutions are utilized by manufacturing facilities to maintain production without major interruptions and avoid unnecessary energy costs. Textile mills, automotive manufacturing, and chemical plants with a high energy intensity enjoy significant cost savings while offering better assurance of stable process operation. Data centers have strict power quality and availability requirements. Solar battery energy storage systems provide primary or ancillary backup to a traditional UPS system while optimizing operational costs through demand charge management.
The market for battery energy storage systems with solar is experiencing exponential growth driven by technology advancement, policy support, and economic viability improvements.
The global capacity of battery storage is expected to grow again, with solar plus storage expected to be the largest share of new installations. Investment in renewable energy storage solutions are at all-time highs, as domestic and international capital flow into new storage projects. Manufacturing capacity is growing rapidly in India for batteries and related components, lowering costs while increasing resilience in the supply chain.
Government policies are a key driver of market development. India's Production-Linked Incentive programs, viability gap funding for energy storage projects, and state-level storage policies are laying the groundwork for adoption of solar battery energy storage systems. Other drivers include capital subsidies, faster depreciation benefits, and cheap financing through development banks for programming costs.
Despite rapid progress, several obstacles constrain broader solar battery energy storage systems adoption.
The upfront capital costs remain significant, particularly for utility-scale projects. Although costs have fallen substantially, solar plus battery backup systems upfront costs are still higher than solar-only projects. Financing requires showing project viability and regulatory support, neither of which is readily available everywhere.
While solar storage batteries for industries can be implemented, there are even more issues with utility-scale storage. The rules for connecting storage to the grid, acquiring land, and obtaining necessary approvals can all extend the timelines. Utility-scale storage must also be coordinated with the transmission infrastructure, which is yet another layer of planning and investment.
Solar-only systems help generate clean electricity, while solar-plus-storage systems offer greater control over when that energy is used.
|
Feature |
Solar Only |
Solar + BESS |
|
Daytime Generation |
Generates power during sunlight hours. |
Generates and stores excess power. |
|
Energy Shifting |
Limited; excess power may be exported to the grid. |
Stores energy for use during non-solar hours. |
|
Backup Capability |
Requires additional backup solutions. |
Can provide backup during grid outages (with suitable configuration). |
|
Grid Flexibility |
Limited flexibility. |
Supports peak shaving, load management and grid balancing. |
|
CAPEX |
Lower initial investment. |
Higher initial investment due to battery costs. |
|
Operating Complexity |
Relatively simple to operate. |
Requires battery monitoring and energy management systems. |
Solar-plus-storage systems go beyond generating renewable energy. They make it possible to store, manage and use electricity when it delivers the most value.
The future of battery storage systems with solar is characterized by ongoing innovation and increased adoption.
Next generation battery chemistries such as solid state, sodium-ion, and advanced flow batteries offer better efficiencies, lower costs, and longer lifespans. These technologies will provide greater benefits of solar battery storage and enable applications limited by existing technologies.
When multiple renewable energy sources are combined with associated storage, they create very credible systems with exceptional cost effectiveness. The hybridization of solar, wind (multiplied by a range of operating conditions), and batteries (or another integrated storage technology) is becoming mainstream, resulting in integrated renewable energy storage solutions with sufficient firmer capacity so that renewable energy storage solutions and have capacity similar to conventional generation resources.
The ultimate hotspot, and very effectively 100% renewable grids operating continuously, is becoming more attainable faster, as private sector (and some public utility) storage technology grows rapidly. Long-duration storage systems (e.g., >2 days) paired with widely dispersed and diversified renewable energy generation and robust transmission will make a path to continuous clean energy possible. Solar plus storage solutions will be foundational to this transformati
Evaluating a BESS investment requires looking beyond the upfront battery cost. Factors such as storage capacity, battery lifespan, efficiency and potential electricity bill savings determine its long-term economic value.
Cost per kWh: Evaluates the upfront investment relative to the system's energy storage capacity.
Battery Duration: Determines how long the system can supply power at its rated output.
Cycle Life: Measures how many charge-discharge cycles the battery can complete before reaching its end-of-life threshold.
Battery Degradation: Accounts for the gradual reduction in storage capacity over time.
Round-Trip Efficiency: Measures how much energy can be recovered compared to the energy used to charge the battery.
O&M Costs: Includes ongoing maintenance, monitoring, cooling and component replacement.
Tariff Arbitrage: Generates savings by charging when electricity is cheaper and discharging during higher-tariff periods.
Financing: Considers interest rates, loan tenure, capital costs and the overall payback period.
A BESS investment should be evaluated based on its total lifecycle cost and achievable savings, rather than just its initial purchase price.
Battery energy storage systems with solar represents a new and disruptive technology that will facilitate our transition to low-cost, reliable, sustainable energy systems. BESS addresses intermittent solar energy, increase reliability and market value of solar in conjunction with active load management, and provide a modern experience that expands the boundaries of renewable energy. The role of BESS in grid stability will simply increase as renewables such as solar penetrate the grid and storage becomes essential and no longer an option.
Sustainable, reliable & affordable energy systems
Battery energy storage systems enhance the reliability of power systems by rapidly responding to frequency and voltage swings; balancing loads with generation and consumption; and providing back-up power in the event of excessive load or loss of generation. Battery energy storage systems can respond to disturbances in the grid in milliseconds, which is much faster than any conventional generation system, and a critical element in providing reliability to the grid, especially as generation technologies like renewables become more prevalent.
The main advantages of solar battery storage systems include higher reliability (providing backup power capabilities); reduced costs (with demand charge savings and time-of-use savings); energy independence (cost savings, limiting exposure to grid situation, and energy price events); increased renewable energy penetration; and better power quality for sensitive equipment and operations.
Solar battery storage is emerging as a viable economic option in many sectors for customers that are subject to strong demand charges or need a high degree of reliability for energy-intensive activities. Typical payback periods for storage are in the 5-8 year range, with systems that can provide immediate positive cash flow from energy cost savings, reduced costs associated with downtime, and revenue creation by providing services to the grid.
While there are many attractive markets for solar plus storage around the world, the solar plus storage market in India is likely to grow very quickly owing to aggressive renewables targets, steep declines in technology costs, subsidized government policies and an increasing reliability of energy for industry's needs. The solar plus storage market is likely to have multiple gigawatts to install on an annual basis over the next five years, and renewable energy storage will become the new standard instead of just a new concept.
