New & Renewable Energy Development Corporation of Andhra Pradesh Ltd.,
(A State Govt. Company)

Frequently Asked Questions

A SRTPV system comprises of electrical and electronic equipment such as solar modules, inverters, cables, switch gears, etc. When these components are connected together and placed on the roof of buildings exposed to sunlight, the system starts generating electricity.

SRTPV Systems are of two types:

  • Grid Connected SRTPV Systems
  • SRTPV Systems with Storage Battery

A grid connected SRTPV system generates electricity that can either be injected directly into the distribution grid or used for captive consumption at the installation premises.

  • Cheaper and environment friendly electricity
  • Excess energy can be fed into the grid with tariff as determined by the State Electricity Regulatory Commissions
  • Electricity generation occurs at consumption center thus, saving transmission and distribution losses
  • Lower payback period
  • Minimal maintenance
  • 25 years guaranteed lifespan of the solar photovoltaic panels
  • Subsidy is available from the Central Government for residential, institutional, and social sectors and from the State Government for selected residential consumers
  • Highly modular
  • Quick installation

No, SRTPV systems cannot generate electricity during the night. If a battery is used to store energy, then this energy can be used at night.

In case of a grid-connected SRTPV system, power supply will be available from the electric grid whenever there is an absence of generation by the system.

Under net metering, electricity generated by the SRTPV system is first utilized by the consumer to meet their internal/captive requirements. Excess electricity, if any, is exported to the grid. Subsequently, when the consumer imports power from the grid, the exports are adjusted against the imports, lowering the electricity bill.

A net meter (bi-directional meter) records the energy imported from the grid to meet the load and surplus energy exported to the grid after consumption. Both energy import and export are recorded in the net meter. The difference between export and import readings is the actual energy consumed/delivered

Under gross metering, all the electricity generated by the SRTPV system is exported to the grid and all the electricity required for consumption by the consumer is imported from the grid. The consumers are paid a feed-in tariff (FIT) for the electricity exported to the grid.

Tariff shall be equal to the Average Cost to Serve (ACOS) of the DISCOM, which will be determined by the APERC every year.

The grid connected SRTPV system of 1 kWp power capacity requires minimum 10 sq. m or 100 sq. ft. shadow free vacant area on the rooftop for installation.

SRTPV system can be installed within one or two months depending upon its capacity.

For every kWp the SRTPV system installed on a South-facing roof will generate 4 to 6 units of electricity per day. However, depending upon the weather conditions the energy generation reduces by around 20 percent for an East or West facing roof.

All kind of loads, including inductive, capacitive, and lighting can be run with SRTPV system.

A SRTPV system is made up of different components. These include PV modules (groups of PV cells), grid tied inverters, circuit breakers, relays, energy meters (net/gross), module mounting structures (MMS), cables, etc.

The capacity can be decided depending on the contracted load with the distribution utility.

An eligible developer can install a SRTPV plant of higher capacity than their contracted load whereas maximum allowable capacity under single-phase service is 3 kWp and maximum allowable capacity under LT category is 56 kWp.

Most roofs are strong enough to take a solar installation without any reinforcement. However, in case of larger systems, it is suggested to obtain the opinion of a qualified Structural Engineer.

The finalized prices in respect of 1-5 kWp Grid Connected SRTPV Systems under each category are as follows:

Sr. No. Category Finalized Price (INR) Total (INR)
Supply Installation and Commissioning
1 1 kWp 75,000 5,000 80,000
2 2 kWp 1,26,900 16,100 1,43,000
3 3 kWp 1,98,450 20,700 2,19,150
4 4 kWp 2,42,680 22,000 2,64,680
5 5 kWp 3,18,550 26,450 3,45,000

The financial bids for empanelment of supply, installation and commissioning of 6-500 kWp grid connected SRTPV power plants at various locations in Andhra Pradesh have been opened on April 23, 2016 at 3.00 PM.

Sr. No. Category Finalized Price (INR/Watt)*
1 6-10 kWp 71
2 11-50 kWp 70
3 51-100 kWp 69
4 101-500 kWp 65

*Rates are towards supply, installation and commissioning of the systems including five years’ warranty

MNRE benchmark cost for the 2017-18 as under:

Description Category Benchmark cost
Grid Connected SRTPV System (INR/Wp) Upto 10 kWp 70
>10-100 kWp 65
>100-500 kWp 60

A SRTPV power plant has a lifespan of 25 years. However, balance of system has different warranty periods depending on the make of the product.

Currently there are two business models that are in vogue namely, self-owned (Capex model) and RESCO/third-party owned model.

Under Capex Model, consumers develop a solar rooftop plant within their premises to own, operate, and generate electricity for consumption (under net metering) or sell to the utility (under gross metering). Generally, self-owned business model is preferred for its simplicity. However, this model also has disadvantages such as high capital cost for the consumer and high technology and performance risk.

Under RESCO Model, a RESCO builds, owns, and operates SRTPV plants in the premises of a consumer to generate and sell electricity to the consumer (under net metering) or to the utility (under gross metering). Consumer and RESCO signs, on mutually agreed basis, Power Purchase Agreement and/or Roof Lease Agreement, which covers tariff of electricity, tenure of the agreement, ownership at the end of the tenure, etc.

In RESCO, consumer is not required to invest in the cost of the SPV power plant, though can enjoy the benefits of the system. RESCOs are specialized solar developers; they can handle technology and operation risks in a better way. However, RESCO model faces several challenges such as power off take risks, contractual risks, etc.

Suitability of the model depends on one’s ability to meet the costs. However, RESCO model is more suitable for commercial, institutional, and industrial consumers needing higher Capex.

Currently the Central Government subsidy equivalent to 30 percent cost of the SRTPV system or benchmark cost, whichever is lower, is available as Central Financial Assistance (CFA) for certain consumer categories such as residential, institutional, and social sectors. All subsidy applications are processed through the State Nodal Agency’s ‘Unified Solar Rooftop Transaction Portal (USRTP)’.

All applications and approvals for subsidy and interconnection will be mediated through USRTP hosted by NREDCAP.

Subsidy application fee, which can be paid online though the portal are as follows:

Sr. No. System Size Fees (INR)
1 Upto 5 kWp 1,000 + Taxes*
2 6-100 kWp 5,000 + Taxes*
3 101-1,000 kWp 10,000 + Taxes*

*Taxes will be levied as per applicable GST rates (18 percent for FY 2017-18).

Interconnection application fee to be paid to the DISCOM is INR 25/-. Additionally, fees for procurement/testing of bi-directional meters will be communicated by DISCOM depending upon the type of meter.

Applications should be submitted through USRTP by registering on the portal.

Application status can be traced through the USRTP by logging in using the registered email Id and password.

Key stakeholders involved are the New and Renewable Energy Development Corporation of AP (NREDCAP), State DISCOMs, Chief Electrical Inspector to Government (CEIG) and Banks/FIs.

Detailed description of procedure for installation is provided under the section ‘Interconnection Process’ on the homepage.

The USRTP is a single stop web portal with information related to the solar rooftop installation process at one point and allows transactions between multiple stakeholders to accelerate solar rooftop system deployment. This platform will enable inter and intra stakeholder communication through a single online portal.

The USRTP will enable interaction with NREDCAP, APEPDCL, APSPDCL, and Partner Banks. Additionally, the USRTP will provide a link to the CEIG’s Ease of Doing Business Portal for seeking drawing and statutory clearances.

NREDCAP has provided a list of empaneled vendors for various capacity categories on the USRTP homepage and at

Yes. All applications related to Grid Connected Solar Rooftop Systems will be processed only through USRTP. Upon submission of Interconnection Application Form 1(A) DISCOM will check the technical feasibility and provide a response through the USRTP. Applicants can register themselves through USRTP and apply online directly using relevant forms and format to the approving authority.

All registered companies, government entities, partnership companies/firms/individuals and consumers of APDISCOM(s) will be eligible for setting up of Solar Rooftop Projects for sale of electricity to DISCOM/captive use or for self-consumption in accordance with the Electricity Act 2003.

A maximum of 1,000 kWp at a single location is allowed under net metering.

No. DISCOM will provide Bi-directional energy meters on cost basis for consumers to avail net metering facility.

Energy settlement will be done on monthly basis.

In case of net metering, the energy generated from SRTPV shall be adjusted against the consumption of energy from the DISCOM by the Eligible Developer/Consumer every month. In case of Groups/Societies, the energy generated shall be prorated as per the installed capacity share indicated in the Agreement between the group/society and DISCOM. This computed energy share shall be adjusted against the consumption of energy for each consumer every month.

In case of excess generation (after energy adjustment) injected into the DISCOMs network in a billing month will be carried forward to next month till every quarter end and settlement will take place on ACoS basis for net metering as determined by APERC from time to time.

In case of Gross metering, the SPV generator shall pay for the energy utilized in a billing month as per applicable retail supply tariff decided by regulatory commission to the concerned DISCOM and energy supplied to DISCOM by the Developer/Consumer will be paid monthly, based on ACoS as determined by APERC from time to time. (net amount will be credited)

For systems above 10 kWp, CEIG approval is compulsory.

Access the AP CEIG website For additional information on the CEIG approval process access the ‘Electrical Inspectorate Process’ through the USRTP homepage.

Consumer has to comply with CEA standards and relevant safety standard as followed by CEIG.

Yes, some banks provide loans especially for Solar Rooftop Systems. This information is available on the USRTP and the applicant can submit their Expression of Interest to the chosen bank through USRTP.

Different banks/FIs have set different eligibility criteria. Please refer to the ‘Finance and Subsidy’ section on the homepage for additional information on loan schemes.

Applicant can submit the EOI through USRTP and bank will redirect the EOI to the concerned local branch for further processing.

Please refer the ‘Help’ section on the USRTP homepage