You could say the city’s appetite for power has gone over 5,000 MW; in fact, it was 5,014 MW on June 10. Even as you hear from folks about the blackouts, this is an all-time high. TNPDCL will tell you they have the supply, but the last-mile side of things is being tested.
What’s at play right now is the kind of heat we’re seeing in the KTCC area. When you have the whole city running ACs and pumps after dark, you get overload at the end points. It’s a case of local breakdowns, not a lack of generation, the utility makes clear.
Why Chennai’s new peak is a warning
Don’t read too much into this week’s figure as a one-off. On June 8, two days prior, it was 4,966 MW, and 4,852 MW back on May 22. Three in a row like that means the base load is up and there is less room to manoeuvre when it’s hot.
Put it in context: Tamil Nadu as a whole hit 21,307 MW on April 29. The rest of the south has been feeling it, with a 66,694 MW peak in early April 2025.
Where the strain is showing
J. Radhakrishnan, the CMD of TNPDCL, is firm on one thing: there is no power shortage in the state. What he sees is overload in certain parts of Chennai, made worse by the weather. You’ll find emergency teams out there to put things right in a hurry.
He won’t deny there are some ‘tough spots’ where the old infrastructure can’t keep up with what is being asked of it in some neighbourhoods. They are working to open up some capacity, and a substation in M.K.B. Nagar is on the way.
The numbers behind the surge
When you are looking after 38.80 lakh consumers in the Chennai region, even a minor fault is magnified. In a place this dense, usage can be high and stay that way well into the evening.
From the North and Central to the South circles, the city is supplied by 253 substations, 40,798 distribution transformers, 16,582 km of high tension lines and 55,000 km or so of low tension ones.
How Chennai’s grid is configured
It is all part of the larger web in Tamil Nadu. In total, the state has 1,910 substations, 39,763 circuit km of EHV lines, 2,11,948 km of HT, 6,66,429 km of LT, 4,47,603 transformers and 351.73 lakh customers to look after.
The point is, you can have a strong system for generation and transmission, but if you have a bottleneck at the end, you lose power in some pockets. That’s why you see outages bunched up at night when the circuits are under the most pressure.
What TNPDCL says and plans next
Radhakrishnan has them moving to head off the overloading and be faster in the field. The idea is to shore up the weak links and hold the line during the busy hours.
Here is what the utility is putting forward:
– We have put in the manpower and called in the emergency teams
– Fixing any breakdowns at the distribution end without delay
– Some locations are due for an upgrade
– A new substation in M.K.B. Nagar will be in place before long
You had a taste of how exposed the network can be in Arumbakkam earlier in the week with a big disruption over some stormwater work. It wasn’t for want of power, but because of what happens when you have to work on the ground near live lines.
So for those in the city, it’s a matter of two things. You should see us restore service in a bit of a rush, and we will be making some improvements where the demand has left the cables behind. We want to stop the night-time trips while the heat is on.
This is a milestone, but with a caution. The figures are going up and our last-mile capacity has to do the same. If we have another run of hot days, it will be down to how quickly we can put these fixes in place on the ground.
