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CTU approval & inter-state connectivity

Inter-state access is a different regime from a state connection — longer lead times, formal milestones and bank guarantees that are actually called.

Approvals · In short

CTU approval is the Central Transmission Utility’s grant of connectivity and access to the inter-state transmission system (ISTS). It is required by generators and bulk consumers who wish to inject into or draw from the national grid rather than remain within one state. The process covers a connectivity application, general or long-term network access, bank guarantees, grid compliance data and subsequent coordination with the Regional Load Despatch Centre. Enersys Engineers prepares and pursues these applications.

ConnectivityLong-term accessGeneral network accessBank guaranteesGrid complianceRLDC coordination
GENERATIONThermal · SolarSTEP-UP11 / 220 kVTRANSMISSIONup to 400 kVSUBSTATION220 / 33 kVDISTRIBUTION33 / 11 kVENERSYS SCOPE — END TO END

Connectivity versus access

ConnectivityPermission to physically connect to the ISTS at a defined substation and voltage. It establishes the interconnection point but does not by itself confer the right to transmit.
Long-term / general accessThe right to inject or draw a defined quantum over the transmission system. This is what makes the connection commercially usable.
Bank guaranteesConstruction and connectivity guarantees lodged against milestone achievement. They are encashed where milestones are missed, which makes programme realism a financial matter.

The technical and commercial submission

  • Application in the CTU’s prescribed format with the connectivity quantum and target date
  • Land, fuel or resource tie-up evidence appropriate to the technology
  • Single-line diagram to the ISTS interconnection point
  • System study demonstrating the effect of the injection or draw
  • Grid compliance data — reactive capability, fault ride-through, harmonics and protection
  • ABT-compliant metering and communication scheme
  • Bank guarantees and the milestone programme they are tied to

What we do

  • Advise whether the project genuinely needs inter-state access or whether an intra-state connection is sufficient — the cheaper answer is often the right one
  • Prepare the application and the supporting studies
  • Manage the milestone programme against which guarantees are held
  • Coordinate the interconnection scheme with the transmission licensee
  • Hand over to RLDC registration and scheduling
Questions

Frequently asked

Does every generator need CTU approval?

No. A plant that injects into and is consumed within the same state deals with the STU. CTU approval is needed where power is to be transmitted across state boundaries over the inter-state transmission system.

What happens if a connectivity milestone is missed?

The bank guarantee lodged against that milestone can be encashed, and the connectivity or access grant can be curtailed. This is why the implementation programme submitted with the application has to be realistic rather than optimistic.

Can Enersys manage both STU and CTU routes?

Yes, and on projects where both apply the two have to be sequenced together — the intra-state interconnection and the inter-state access are rarely independent of each other.

Related

What usually goes with this

These are the adjacent scopes clients most often need alongside it.

Approvals

STU approval & intra-state connectivity

Bay availability, not plant construction, is usually the binding constraint on when a project can be energised.

Read more →Approvals

SLDC, RLDC & NLDC registration and scheduling

Registration is a one-off. Scheduling and deviation settlement are for the life of the asset — and they carry real money.

Read more →Consultancy

Power trading & open access advisory

Open access is only worth doing once the surcharges are counted. We do that arithmetic before you apply, not after.

Read more →Approvals

Statutory approvals & liaisoning

Approvals do not delay projects. Approvals started late delay projects. We run them alongside construction, not after it.

Read more →
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