Power outages are a practical reality in Chennai, and the quality of a building's backup power system determines how disruptive each outage is for residents. An apartment buyer who does not check the power backup specification before booking may find that lifts stop during cuts, water pumps go offline and individual flat supply is simply absent until the grid recovers. A buyer who does check it understands exactly what the DG set covers, whether individual-flat backup is included, what the start-up delay is and how the diesel running cost is billed. These are confirmable facts that any developer's site team can answer during a site visit.

Prestige Medavakkam is a pre-launch gated apartment project by Prestige Group on Medavakkam–Sholinganallur Road. Our home safety and security guide covers related topics including CCTV systems, access control and fire safety, all of which depend on reliable backup power for uninterrupted operation. This guide focuses specifically on power backup: what each component does, what to check before booking and what questions to ask on your site visit.

Apartment Power Backup: What to Check Before Booking

The table below outlines the six power backup topics that matter most for apartment buyers in Medavakkam. Use this as a checklist when speaking with the developer's sales team and during your site visit.

DG Sets, ATS and What the Common-Area Backup Actually Covers

A diesel generator (DG) set is the primary backup power source in most Medavakkam gated communities. The DG set is sized in kilo-volt-amperes (kVA) and is designed to carry a defined set of loads when the mains grid supply fails. In a typical project, the DG covers lifts, water pumps, CCTV cameras, security system panels and common-area lighting. What it often does not cover, in projects that offer only common-area backup, is the individual flat's lights, fans, air conditioners and kitchen appliances. The buyer who discovers this after possession, during their first Chennai summer power cut, is understandably frustrated.

An Automatic Transfer Switch (ATS) is the mechanism that connects the DG set to the building's electrical system automatically when the mains supply fails. Without an ATS, a DG set must be started manually by the watchman or maintenance team, which increases the gap between the power cut and the DG powering up. In well-managed gated communities, an ATS reduces this gap to a few seconds. On a site visit, ask the developer whether the DG is fitted with an ATS and whether the ATS has been commissioned and tested. Our EV charging and parking guide covers how the electrical infrastructure of a project affects EV charging provision, which is directly linked to the overall power backup and distribution system.

Bottom line: Confirm which loads the DG covers, whether an ATS is fitted, and what the DG start-up time is; visit the project during a power cut if possible to observe the actual backup performance.

Individual-Flat Backup, Home Inverters and Solar

Individual-flat DG backup means that a portion of each flat's electrical load is connected to the DG circuit, so that lights, fans and select appliances continue to run during an outage. Not all Medavakkam projects offer this; those that do typically charge a higher maintenance amount to cover the additional DG capacity and fuel cost. When a project offers individual-flat backup, confirm the percentage of the flat's load that is covered: some projects back up the full flat, while others back up only the lighting and fan circuits, excluding air conditioners. Get the specification in writing in the Agreement for Sale.

For buyers in projects that do not offer individual-flat DG backup, a home inverter or UPS is the practical alternative. A home UPS can be installed by the owner after possession to power lights, fans, a router and computers during short outages and during the DG start delay. The size of the UPS (in VA or kVA) depends on the load you intend to back up; an electrician can advise on sizing once you know the flat's distribution board layout. Rooftop solar for common areas is a separate initiative that reduces the community's diesel consumption and, over time, can lower maintenance charges. Our sustainable and green living guide covers solar provision for common areas, rainwater harvesting and other green infrastructure topics in more detail. The apartment maintenance and society living guide explains how DG running costs and maintenance charges are typically structured and billed in a residents' welfare association.

Bottom line: Confirm in writing whether individual-flat DG backup is included and which circuits are covered; if not, plan for a home inverter after possession; ask about rooftop solar and its impact on maintenance charges.

Questions to Ask on Your Site Visit and Making the Decision

Power backup is one of the easier infrastructure items to verify during a site visit because it involves physical equipment you can see: the DG set room, the ATS panel, the distribution board and the fuel storage arrangement. Ask the developer's site team the following questions and note the answers in writing: What is the DG kVA rating? Which loads are on the DG circuit? Is there an ATS? Is individual-flat backup included? How is the DG running cost billed? Is there rooftop solar and how does it affect maintenance charges? If the developer cannot answer these questions during the site visit, ask for them in writing before signing the Agreement for Sale.

For buyers comparing projects in Medavakkam, power backup specification is a useful differentiator that is rarely advertised prominently but meaningfully affects daily living quality during Chennai's periodic outages. A project with DG plus ATS plus individual-flat backup at a slightly higher price per square foot may represent better value for an end-user family than a project with common-area-only backup at a lower price, once the recurring inconvenience and the cost of a home UPS are factored in. Make the comparison explicit: list what each project offers, confirm it in writing, and weigh it against the price difference before committing.

Bottom line: Ask specific questions about DG coverage, ATS, individual-flat backup and billing on every site visit; get the answers in the Agreement for Sale or the building specification document before signing.

Conclusion

Power backup quality in a Medavakkam apartment comes down to six things: what the DG set covers, whether individual-flat backup is included, whether an ATS is fitted, whether rooftop solar reduces the diesel load, how the running cost is billed and whether a home UPS can be added after possession. All six are confirmable facts that a developer's site team can answer during a visit. The answers should be reflected in the building specification document attached to the Agreement for Sale. Buyers who verify these details before signing avoid unwelcome surprises and can compare projects on a like-for-like basis. To find out about the power backup specification at Prestige Medavakkam, contact the sales team for details on the project's electrical infrastructure and backup provision.