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Help needed for a paper on Renewable Energy Based Distributed Generation in Tamil Nadu

Currently I am working on a scoping paper regarding renewable energy based distributed  generation in Tamil Nadu. I need to compare the benefits and challenges of DISTRIBUTED RENEWABLE ENERGY technologies with UTILITY SCALE RENEWABLE ENERGY technologies which are GRID CONNECTED ( Economical, technical, environmental and social  benefits and challenges). Unfortunately, I am not able to find appropriate references for my research. Could you please help me if it is possible?


This is actually a very good question with complex answers.

Price per watt. If you buy anything in a large volumes it will obviously be less expensive than if you buy it in much lower volumes. Currently the price per watt for utility-scale PV (in the US) is about $1.10. For residential-scale it's about $1.60. (Source: NREL).

Taking advantage of multiple value streams. Battery energy storage systems (BESS) can provide multiple grid services. However PJM was a pioneer in implementing these in their grid, but only focused on frequency regulation. As a result the BESS implemented on their grid are configured to only provide this service. California (CAISO, CPUC, etc.) came in a few years later and learned from this and made sure their rules allowed the BESS to support multiple services.

Utility-owned dispatchable generation (BESS or PV+storage) can probably be repurposed to focus the dispatch on a particular function or service fairly easily. Distributed energy resources use a tariff and the conditions therein to define how the owner (facility or residence owner) dispatches them, which is generally in a manner that results in the best financial outcome for the owner. Changing an existing tariff is not a trivial matter.

There are other considerations. It just so happens I will post the first part of a two-part series (a long paper) that delves into this issue rather deeply in about a week, and the second part about a week later. Check into my public site.


Rohith C Unni's picture
Rohith C Unni on Feb 12, 2019 4:55 am GMT

Dear John, 

Thank you so much. In this study storage is not in our scope( may include in the later stage). The excess energy produced is fed into the grid. The government utilities are not encouraging distributed generation much because of various reasons. Our challenge is to mention the benefits for the utilities and developers which is provided by the distributed generation scenario. I need to compare major benefits of distributed generation  with that of utility scale renewable energy genertion.



I would suggest scouting the NREL and LBNL publications databases:


I think you will find several papers with valuable info, including references to models andtools you may be able to adapt to Tamil Nadu.

good luck!


Rohith C Unni's picture
Rohith C Unni on Feb 14, 2019 9:11 am GMT

Dear Michael, thank you so much for your response. I have gone throuh the link and it was very useful. I am looking forward for more details regarding this. I need to convince the policy makers by mentioning major benefits to the utilities. Definitely the financial benefits depend on the tariff structure and LCOE for different technologies. The dedicated papers for technical and financial implications of distributed generations are on pipeline. The challenge I face now is how to disseminate information which is highly technical in a simple layman way while also passing on the information since the policy makers may not be from a technical or engineering background.


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