Open Access, Explained: How India Opened Its Power Grid to Choice

OPEN ACCESS SERIES · PART 01 · SLNKO RESEARCH DESK

India's energy landscape is undergoing one of the most significant shifts in its history. For a growing set of businesses, electricity is no longer just an operational line item - it has become a strategic decision that touches cost, sustainability commitments, investor expectations and long-term planning. Rising tariffs, ambitious decarbonisation targets and pressure from global supply chains have all pushed companies to look past their local distribution company for how they buy power.

The single development that has made this possible is open access - the reform that lets eligible consumers buy electricity from an independent generator, rather than only from the utility that happens to serve their area.

Despite its growing adoption, open access remains one of the most misunderstood ideas in the Indian power sector. Businesses hear terms like captive power, group captive, green energy open access, wheeling charges and banking without a clear sense of how they fit together.

This is the first post in a series that will work through open access one layer at a time. This post stays deliberately at the level of the idea - what open access is, where it came from, and how it works - so that the posts on procurement models, the green energy framework, and charges and tariffs each have a foundation to build on.

01 What open access actually means

Open access is the principle that the electricity grid is shared infrastructure, not the private property of one utility - and that any eligible generator, licensee or consumer can use it, for a fee, on fair and non-discriminatory terms.

The Electricity Act, 2003 defines open access in exactly these terms: the non-discriminatory provision for the use of transmission lines, the distribution system, and associated facilities by any licensee, consumer, or generating company, subject to the regulations laid down by the appropriate commission.

A useful way to picture it is a toll road. The road itself is shared public infrastructure. You do not have to buy your goods from whoever happens to own the highway - you buy from a supplier of your choosing and pay a toll to move those goods to your destination. Open access applies the same logic to electricity: it separates the delivery of power, which happens over the shared grid, from the supply of power, which becomes something a consumer can shop for. Once those two things are unbundled, a factory in one state can, in principle, buy electricity from a solar park several hundred kilometres away and have it delivered over wires it does not own.

02 Where it came from: the Electricity Act, 2003

For decades, the Indian power sector was built around State Electricity Boards - vertically integrated bodies that generated, carried and sold electricity within a single state monopoly. A consumer had exactly one supplier, with no mechanism for competition to bring prices down or reward a better product, and the system was under severe financial strain.

The Electricity Act, 2003 was the reform written to fix this. It replaced the older laws governing the sector and restructured it around competition and independent regulation. Central to the Act was the unbundling of the old integrated boards into separate generation, transmission and distribution companies, and the creation of independent regulatory commissions to oversee them. Open access was one of the pillars of this new design - the Act placed a duty on distribution licensees and directed state regulators to introduce open access in distribution in phases, so large consumers could eventually reach past the local utility and choose their own source of supply.

Since then, the framework has kept evolving. The Central Electricity Regulatory Commission, State Electricity Regulatory Commissions and the Ministry of Power have continued to simplify implementation and widen adoption - most notably through the green energy open access rules, which lowered the entry threshold specifically for renewable procurement. A later post in this series covers that framework in detail.

03 How it works in practice

Under open access, the three functions the old boards bundled together are treated as separate links in a chain. Generation happens at a power plant - a solar or wind project, a thermal station, or a trader aggregating supply. Transmission carries that power in bulk, at high voltage, over long distances. Distribution handles final delivery into a consumer's premises at usable voltage.

A renewable energy developer builds and operates the generation project. An eligible consumer signs a power purchase agreement with that developer for an agreed duration. Instead of building a dedicated line between the two, the electricity flows through the existing transmission and distribution network - and system operators handle the scheduling, balancing and settlement that ensure what is generated and what is consumed are properly matched and accounted for, even though the physical electrons follow the grid's own path rather than a direct line from generator to consumer.

The consumer pays two broad things: the negotiated price of the energy itself, agreed with the chosen generator, and a set of charges for using the network and meeting regulatory obligations. The utility that owns the wires is obliged to provide access on a non-discriminatory basis - it cannot refuse to carry a competitor's power to protect its own sales. That obligation, often described as the grid acting as a common carrier, is the heart of open access. The specific charges are where much of the real economics lives, and they get a dedicated treatment in Part 3 of this series.

04 Inter-state, intra-state, and the question of duration

Open access is usually described along two dimensions. The first is geography. Intra-state open access covers power sourced and consumed within the same state, using that state's network and governed by the state regulator. Inter-state open access covers power that crosses state boundaries over the centrally governed inter-state transmission system. A large share of renewable procurement is inter-state, simply because the best solar and wind resources are concentrated in a handful of states while demand is spread across the country.

The second dimension is time. Open access can be long-term, committed for many years by a consumer that wants firm capacity; medium-term, running from a few months to a few years; or short-term, arranged for up to a month and often transacted a day ahead through a power exchange. Where a consumer sits on this spectrum shapes how it contracts, how much flexibility it keeps, and how it is charged - one of the first practical decisions any open access buyer has to make.

05 Who runs the system

Open access works because a defined set of institutions each play a specific role. Regulators set the rules and approve the charges: the Central Electricity Regulatory Commission at the national level for inter-state matters, and a State Electricity Regulatory Commission in each state for matters within its borders. The physical network is planned and maintained by transmission utilities - the Central Transmission Utility for the inter-state grid and the State Transmission Utility in each state.

Then there are the operators who run the grid in real time: the load despatch centres, from the national and regional centres for the wider grid down to the State Load Despatch Centre in each state, which also processes open access applications and clears schedules locally. Grid-India operates the national grid as a whole. For any single open access transaction, these bodies collectively decide whether capacity is available, approve the schedule, and account for what actually flows - knowing who does what is less about bureaucracy and more about knowing which door to knock on when a project needs an approval.

06 Who can use open access, and who benefits most

Open access was designed with larger consumers in mind. The long-standing threshold for conventional open access is a connected load of 1 MW and above - in practice, industrial and large commercial consumers. For renewable energy specifically, the entry point has since been brought down, a change tied to the green energy framework covered later in this series.

In practice, the businesses exploring open access span a wide range: manufacturing plants, automotive and pharmaceutical facilities, textile mills, food processing units, cement and steel units, data centres, warehousing and logistics facilities, IT parks, hospitals, educational institutions, airports, metro rail systems, and large commercial real estate and office campuses. Eligibility still depends on state-specific regulatory and technical criteria that should be evaluated case by case, but as the regulatory landscape keeps evolving, a growing number of businesses find themselves eligible.

The consumers who gain the most are those with steady, sizeable demand and the willingness to manage a slightly more involved procurement process in exchange for real control over price and source. For a business in that position, open access is what makes it possible to buy power directly from a specific solar or wind project rather than accepting whatever generation mix the local utility happens to supply.

How consumers actually participate - through third-party sale, captive, and group captive arrangements - is covered in Part 2 of this series.

07 Why businesses are choosing open access

Three things make open access consequential. The first is cost: large consumers facing rising utility tariffs can often secure cheaper, more predictable power by contracting directly with a generator, turning electricity from a fixed overhead into something a business can actively manage. Long-term agreements also improve visibility into future energy expenses, which helps with financial planning.

The second is choice, and with it, clean energy. Open access is the single most important route for companies pursuing renewable energy and decarbonisation commitments, because it lets them source power from a named solar or wind asset rather than the grid average, and account for it against their own targets. This matters increasingly to multinational corporations with global net-zero commitments, and to businesses whose rooftop space or on-site generation potential falls well short of their actual electricity demand.

The third is competition and market depth. By letting supply and demand meet outside the boundaries of a utility monopoly, open access has helped build genuine markets for electricity in India, including the power exchanges and spot markets where short-term power is now traded openly. For a country adding renewable capacity at pace, open access is effectively the plumbing that connects new clean generation to the consumers who want to buy it.

08 More than just buying cheaper electricity

One of the most common misconceptions about open access is that it is simply a way to cut the electricity bill. Cost is certainly part of it, but for a growing number of businesses, open access has become part of a broader shift in how energy procurement gets decided.

Energy is increasingly treated as a strategic asset that touches operational resilience, ESG performance, investor confidence and supply-chain competitiveness - not just today's tariff. Companies weighing an open access project are as likely to be thinking about future regulatory direction, carbon-reduction commitments and long-term energy security as they are about the price per unit. Open access is what gives them the room to make that call themselves, rather than accepting whatever the local utility happens to offer.

Evaluating open access or captive solar for your business?

SLNKO Energy is an EPC and EPCM partner that helps commercial and industrial clients evaluate and execute open access and captive solar projects - from procurement model selection through grid connection and build. If you are weighing whether open access fits your load and location, talk to our team.

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09 Where this leaves us

To put it in a single line: open access is the right of eligible consumers to use the shared grid to buy electricity from a source of their choosing, established by the Electricity Act, 2003 to break the utility monopoly and bring competition into the sector. That is the concept, and it is enough to build on.

What this post has left untouched is, by design, exactly what makes open access work in practice and what decides whether a given project is worth pursuing for a specific business. Those details sit in the posts still to come.

Coming next in this series

• [The procurement models.](/media/blogs/open-access-models-third-party-captive-group-captive) How consumers actually participate - third-party sale, captive, and group captive arrangements - and the ownership and consumption thresholds that separate one from another.
• [The charges and tariffs.](/media/blogs/open-access-charges-cost-stack-explained) The network fees, surcharges, and banking terms that sit on top of the energy price and determine the true landed cost of open access power.
• The green energy framework. The green energy open access rules that have reshaped entry thresholds, timelines, and the priority given to renewable power.
• Risks and eligibility. Approval processes, common implementation challenges, and how to evaluate whether open access is the right fit for a specific business.

Continue with Part 2: Open Access Models - Third-Party, Captive and Group Captive.

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Slnko Energy Private Limited

A technology-enabled solar EPC and EPCM partner working across India's utility-scale and commercial and industrial solar landscape. This series is written to make the open access framework legible, one layer at a time, from the perspective of the teams that plan, connect, and build the projects behind it.

Delivery models for the projects behind open access: Solar EPC vs EPCM.