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View article: SolarAPP+ Performance Review: Final Technical Report
SolarAPP+ Performance Review: Final Technical Report Open
The National Renewable Energy Laboratory (NREL) and its project partners have developed the novel Solar Automated Permit Processing plus (SolarAPP+) software platform that provides a flexible, web-based PV-permitting tool for residential s…
View article: Solar Pathways for the Low-Income Home Energy Assistance Program (LIHEAP) and the Weatherization Assistance Program (WAP)
Solar Pathways for the Low-Income Home Energy Assistance Program (LIHEAP) and the Weatherization Assistance Program (WAP) Open
This poster summarizes the findings in the NREL technical report "Solar Pathways in Federal Energy Assistance Programs: Expanding the Low-Income Home Energy Assistance Program (LIHEAP) and the Weatherization Assistance Program (WAP)" (NREL…
View article: SolarAPP+ Performance Review (2023 Data)
SolarAPP+ Performance Review (2023 Data) Open
The Solar Automated Permit Processing Plus (SolarAPP+) platform is an online portal to facilitate and expedite rooftop solar photovoltaic (PV) and battery storage permitting processes. SolarAPP+ allows PV contractors to upload system speci…
View article: Solar Pathways in Federal Energy Assistance Programs: Expanding the Low-Income Home Energy Assistance Program (LIHEAP) and the Weatherization Assistance Program (WAP)
Solar Pathways in Federal Energy Assistance Programs: Expanding the Low-Income Home Energy Assistance Program (LIHEAP) and the Weatherization Assistance Program (WAP) Open
The U.S. Department of Health and Human Services Low-Income Home Energy Assistance Program (LIHEAP) and U.S. Department of Energy Weatherization Assistance Program (WAP) are federal programs to help low-income households reduce their energ…
View article: Weatherization Assistance Program and Low Income Home Energy Assistance Program for Solar Survey Responses and Plan
Weatherization Assistance Program and Low Income Home Energy Assistance Program for Solar Survey Responses and Plan Open
This data contains the results of surveys given to Low Income Home Energy Assistance Program (LIHEAP)/Weatherization Assistance Program (WAP) administrators in 2022, 2023, and 2024, as well as spreadsheets coding states' annual LIHEAP and …
View article: Next Generation Integrated PV Products Cost and Workflow Analysis (Final Report)
Next Generation Integrated PV Products Cost and Workflow Analysis (Final Report) Open
Residential photovoltaic (PV) costs have fallen consistently for over a decade (Ardani et al. 2018). DOE has subsequently developed a new residential PV cost target for 2030 of $0.05/kilowatt hour (SETO 2023). Ardani et al. (2018) conclude…
View article: Solar and Energy Efficiency: Resources to Support Local Initiatives for Low-to-Moderate Income Communities
Solar and Energy Efficiency: Resources to Support Local Initiatives for Low-to-Moderate Income Communities Open
This SolSmart webinar serves as an educational resource for local governments interested in better understanding market barriers and expanding solar and energy efficiency deployment in low to moderate income (LMI) communities. Viewers will…
View article: SolarAPP+ Performance Review (2022 Data)
SolarAPP+ Performance Review (2022 Data) Open
The Solar Automated Permit Processing Plus (SolarAPP+) platform is an online portal to facilitate and expedite rooftop solar photovoltaic (PV) permitting processes. SolarAPP+ allows PV contractors to upload system specifications, have thos…
View article: Observations and Lessons Learned From Installing Residential Roofing-Integrated Photovoltaics
Observations and Lessons Learned From Installing Residential Roofing-Integrated Photovoltaics Open
Building-sited solar photovoltaics (PV) could play a key role in decarbonizing the building sector either through racked and mounted PV or through Building-integrated PV (BIPV). BIPV is installed into the building envelope itself, with sol…
View article: Data Analytics for Residential PV from Permit to Interconnect (Final Technical Report)
Data Analytics for Residential PV from Permit to Interconnect (Final Technical Report) Open
The main objective of this research is to provide novel insights into the effects of permitting, inspection, and interconnection (PII) processes on PV system installations—and in particular, into the relationship between PII processes and …
View article: Observations and Lessons Learned in Residential Roofing Integrated Photovoltaics
Observations and Lessons Learned in Residential Roofing Integrated Photovoltaics Open
The data file includes field observations of residential roofing integrated photovoltaics installation that happened between July 2021 and June 2022 in California. There are 21 observations - 2 in the re-roofing category and 19 in the new …
View article: Residential Solar Adoption Timelines and Impacts from the COVID-19 Pandemic
Residential Solar Adoption Timelines and Impacts from the COVID-19 Pandemic Open
In this study we evaluate PII and other PV adoption timelines from 2017-2021. We use project-level data collected by the National Renewable Energy Laboratory (NREL) for the Solar Time-Based Residential Analytics and Cycle Time Estimator (S…
View article: Delivering Low-Income Solar: Barriers and Opportunities
Delivering Low-Income Solar: Barriers and Opportunities Open
This presentation was shared with post NCAP and NASCSP to discuss the barriers and opportunities in terms of delivering solar power to low-income communities.
View article: Savings in Action: Lessons from Observed and Modeled Residential Solar Plus Storage Systems [Slides]
Savings in Action: Lessons from Observed and Modeled Residential Solar Plus Storage Systems [Slides] Open
The study performed two related analyses using data from a new-construction residential community equipped with rooftop solar and storage (S+S) in Arizona. The study analyzed the factors that determine customer electricity cost savings fro…
View article: Community Solar Resources for Multifamily Affordable Housing Providers [Slides]
Community Solar Resources for Multifamily Affordable Housing Providers [Slides] Open
As part of an initiative to support Multifamily Affordable Housing (MFAH) providers in their efforts to accelerate deployment of community solar, the U.S. Department of Energy (DOE)'s National Community Solar Partnership (NCSP) convened a …
View article: Savings in Action: Lessons from Observed and Modeled Residential Solar Plus Storage Systems
Savings in Action: Lessons from Observed and Modeled Residential Solar Plus Storage Systems Open
This NREL study used data from a new-construction residential community equipped with rooftop solar and storage (S+S) in Arizona to analyze the factors that determine customer electricity cost savings and emissions impacts of S+S in the re…
View article: Check the Storage Stack: Comparing Behind-the-Meter Energy Storage State Policy Stacks in the United States
Check the Storage Stack: Comparing Behind-the-Meter Energy Storage State Policy Stacks in the United States Open
A variety of studies and disparate datasets track state energy storage polices, but these datasets do not cover all BTM-related storage policy. Moreover, these databases do not align these policies with the policy stacking framework. Thus,…
View article: SolarAPP+ Performance Review: 2021 Data
SolarAPP+ Performance Review: 2021 Data Open
Accelerating rooftop solar photovoltaic (PV) deployment has strained the capacity of local authorities responsible for permitting, inspection, and interconnection (PII). Given the ongoing expansion of rooftop PV, a growing number of author…
View article: Solar Automated Permit Processing Software for Distributed PV (Cooperative Research and Development Final Report, CRADA Number CRD-19-00825)
Solar Automated Permit Processing Software for Distributed PV (Cooperative Research and Development Final Report, CRADA Number CRD-19-00825) Open
NREL and its project partners built and commercialized the novel Solar Automated Permitting Processing Plus (SolarAPP+) software platform that delivers instant residential rooftop solar permits. The tool provides installers with a standard…
View article: Assessing the New Home Market Opportunity: Case Study and Cost Modeling for Solar and Storage in 2030
Assessing the New Home Market Opportunity: Case Study and Cost Modeling for Solar and Storage in 2030 Open
This NREL study considers how solar and storage are incorporated into new home construction and identifies potential barriers and opportunities for scaling this model nationwide with the goal of creating pathways to reduce installation cos…
View article: Savings in Action: Lessons from Observed and Modeled Residential Solar Plus Storage Systems
Savings in Action: Lessons from Observed and Modeled Residential Solar Plus Storage Systems Open
The electric grid is rapidly evolving as small-scale, demand-side resources play increasingly important roles in grid operations and decarbonization. Maximizing the potential of demand-side resources involves incentivizing electricity cust…
View article: Evaluating the Impact of Residential Solar Contract Cancellations in the United States
Evaluating the Impact of Residential Solar Contract Cancellations in the United States Open
The residential solar photovoltaic (PV) market in the United States has grown rapidly in the last decade, from less than 50,000 systems installed in 2010 to over 420,000 systems in 2020 (Davis et al., 2021). The process for installing resi…
View article: SolarAPP+ Pilot Analysis: Performance and Impact of Instant, Online Solar Permitting
SolarAPP+ Pilot Analysis: Performance and Impact of Instant, Online Solar Permitting Open
The National Renewable Energy Laboratory (NREL) led a collaborative effort to develop the Solar Automated Permit Processing Plus (SolarAPP+), a no-cost solar permitting software solution to address residential solar photovoltaic (PV) permi…
View article: A Retrospective Analysis of Distributed Solar Interconnection Timelines and Related State Mandates
A Retrospective Analysis of Distributed Solar Interconnection Timelines and Related State Mandates Open
Most distributed residential photovoltaic (PV) systems must secure an interconnection agreement prior to operation that ensures the local electrical system operates safely within the broader electrical grid. Many states' utility commission…
View article: Behind-the-Meter Storage Policy Stack
Behind-the-Meter Storage Policy Stack Open
A variety of studies and disparate data sets track state energy storage policies, but these datasets do not cover all BTM-related storage policy. Moreover, these databases do not align policies with the policy stacking framework. Thus, it …
View article: Affordable and Accessible Solar for All: Barriers, Solutions, and On-Site Adoption Potential
Affordable and Accessible Solar for All: Barriers, Solutions, and On-Site Adoption Potential Open
Solar energy technologies can be used as part of a suite of tools to reduce the energy burden of low-income customers, but to date, low- and moderate-income (LMI) customers have not adopted solar at the same rate as other income groups. Th…
View article: Solar permitting, inspection, and interconnection cycletimes and requirements
Solar permitting, inspection, and interconnection cycletimes and requirements Open
Twenty three small-to-large residential, commercial, and industrial PV installers submitted project-level data for analysis, which included timestamps for major components of the permitting, inspection, and interconnection process as well …