Database of State Incentives for Renewables and Efficiency (DSIRE)

DSIRE is the most comprehensive source of information on incentives and policies that support renewables and energy efficiency in the United States. Established in 1995, DSIRE is currently operated by the N.C. Solar Center at N.C. State University, with support from the Interstate Renewable Energy Council, Inc. DSIRE is funded by the U.S. Department of Energy

The North American Board of Certified Energy Practitioners (NABCEP)

NABCEP offers entry level knowledge assessment, professional certification, and company accreditation programs to renewable energy professionals throughout North America. Raising industry standards and promoting consumer confidence, NABCEP is known as the “gold standard” for PV and Solar Heating Installation and PV Technical Sales Certifications.

NREL’s PVWatts® Calculator

The PVWatts Calculator estimates the energy production and energy cost of grid-connected photovoltaic (PV) energy systems throughout the world. It allows homeowners, small building owners, installers, and manufacturers to easily develop estimates of the performance of potential PV installations.

NREL's PVWatts® Calculator Estimates the energy production and cost of energy of grid-connected photovoltaic (PV) energy systems throughout the world. It allows homeowners, small building owners, installers and manufacturers to easily develop estimates of the performance of potential PV installations
The Solar America Board for Codes and Standards (Solar ABCs)

Solar ABCs is a collaborative effort funded by the U.S. Department of Energy that dedicates experts to transforming solar markets by improving building codes, utility interconnection procedures, and product standards, reliability, and safety, and is part of its overall strategy to reduce barriers to the adoption of solar technologies and to stimulate market growth. Here you will find an interactive solar reference map intended to provide quick and intuitive access to weather data needed to install code-compliant PV systems.

Solar ABCS
Sun path chart program

This program creates sun path charts in Cartesian coordinates for: (1) “typical” dates of each month (i.e.; days receiving about the mean amount of solar radiation for a day in the given month); (2) dates spaced about 30 days apart (from one solstice to the next); or (3) a single date you specify. You can select whether hours are plotted using local standard time or solar time. In addition, there are a number of options available to allow you to alter the chart’s appearance.

PERMITS hosts the National Solar Permitting Database, a free online database of information related to solar permitting requirements of cities and counties across the country. Developed by Clean Power Finance and supported by a Department of Energy grant, organizes and simplifies solar permitting processes by compiling the information in a single location. Using the community-based platform, users of the database keep the information up-to-date and relevant. The project’s goal is to minimize the time and resources required and to support the mass-market adoption of solar.

Solar Permit Org
NOAA Solar calculator

The NOAA Solar calculator allows users to pinpoint their desired location on a Google map interface. Accurate latitude and longitude coordinates are then combined with the user’s desired date and time values to generate estimates for sunrise, sunset, solar noon, and the position of the sun in the sky.

NOAA Solar calculator
Greenhouse Gas Equivalencies Calculator

Did you ever wonder what reducing carbon dioxide (CO2) emissions by 1 million metric tons means in everyday terms? The greenhouse gas equivalencies calculator can help you understand just that, translating abstract measurements into concrete terms you can understand, such as “equivalent to avoiding the carbon dioxide emissions of 183,000 cars annually.”

This calculator may be useful in communicating your greenhouse gas reduction strategy, reduction targets, or other initiatives aimed at reducing greenhouse gas emissions.

EPA CO2 Calculator