Senate Bill 5111, signed by Washington's governor in May 2005, created a reduced business and occupation (B&O) tax rate for Washington manufacturers of solar-electric (photovoltaic) modules, stirling converters, or silicon components of those systems.

In May 2009, Washington enacted SB 6170, effective July 1, 2009. This bill reduced the B&O tax rate to 0.275%, effective October 1, 2009. This tax rate is 43% lower than the standard manufacturing B&O tax rate. This reduced tax rate applies to manufacturers of photovoltaic modules, stirling converters, solar grade silicon, silicon solar wafers, silicon solar cells, thin film solar devices or compound semiconductor solar

Residential

The Boulder Green Points Building Program is a mandatory residential green building program that requires a builder or homeowner to include a minimum amount of sustainable building components based on the size of the proposed structure. Similar to the US Green Building Council's LEED program, the Boulder Green Points program awards points for a menu of sustainable building practices. Renewable energy and energy efficiency technologies are among the optional components a builder can use to earn points.

New construction projects also must show energy efficiency compliance through the Home Energy Rating System (HERS). The required HERS index varies according

The California Contractors State License Board administers contractor licenses. The C-46 Solar Contractor license covers active solar water and space heating systems, solar pool heating systems, and photovoltaic systems. C-46 requirements include four years of experience and passing the business and law exam and the trade exam. Independent license schools offer courses to prepare for license exams.

Other contractor licenses for solar include:

• A. General Engineering
• B. General Building
• C-4. Boiler, Hot Water Heating and Steam Fitting (for solar thermal systems)
• C-10. Electrical (for photovoltaics only)
• C-20. Warm-Air, HVAC (HVAC systems that utilize solar energy)
• C-36. Plumbing (solar thermal systems)

Under the Solar Energy Standards Act of 1976, the Florida Solar Energy Center (FSEC) is responsible for certifying all solar equipment sold in Florida, unless the equipment has been otherwise certified by a licensed engineer to meet the standards in Florida's most recent building code. 

A manufacturer who wishes to have their solar equipment certified first contacts FSEC for an application and requests that FSEC test samples of the product at random. Equipment is then subjected to a series of tests in order to be approved or denied certification. Standards and applications procedures for specific technologies are available on the

Nevada established a renewable portfolio standard (RPS) as part of its 1997 restructuring legislation. Under the standard, NV Energy (formerly Nevada Power and Sierra Pacific Power) must use eligible renewable energy resources to supply a minimum percentage of the total electricity it sells. In 2001, the state increased the minimum requirement by 2% every two years, culminating in a 15% requirement by 2013. The portfolio requirement has been subsequently revised, most significantly by SB 358 (2019), which increased the requirement to 50% by 2030. In addition to solar, qualifying renewable energy resources include biomass, geothermal energy, wind, certain hydropower, energy

Note: As of May 2025, the Public Utilities Commission of Nevada is considering proposals from Nevada Power and Sierra Pacific Power to change their net metering policies in Commission dockets 25-02016 and 25-03006.

Nevada's original net-metering law for renewable-energy systems was enacted in 1997 and amended in 2001, 2003, 2005, 2007, 2011, 2013, 2015, and 2017. Systems up to one megawatt (MW) in capacity that generate electricity using solar, wind, geothermal, biomass and certain types of hydropower are generally eligible, although systems greater than 25 kilowatts (kW) in capacity may be subject to certain costs at the utility's discretion. Systems

In May, 2019 The Montgomery County Commissioners announced a wind energy purchase that will power all of the county’s electrical accounts with emission-free renewable power. In addition to the wind generated electrical purchase, the Commissioners made a commitment to transition to renewable energy for heating all county-owned buildings and powering all county-owned vehicles by 2050.

How homeowners can purchase renewable energy

Since the energy market in Maryland is deregulated, you can choose your electricity supplier and the source of the electricity you want to buy. As a result, you do not need to install special equipment to receive clean energy

Oregon requires trade licenses for individuals installing solar energy equipment, and contractor licenses for the companies that do construction.

Companies with an electrical contractor license may engage in the business of making electrical installations. Similarly a plumbing contractor license allows a company to engage in the business of making plumbing installations. Companies must also meet licensing and bonding requirements of the Construction Contractors Board.

Individuals doing installations must hold a trade license. Solar electric installers must either hold an Electrical Journeyman's License or a Limited Renewable Energy License (LRT). General Journeymen can do all aspects of solar electric work, whereas

Legislation enacted in Idaho in April 2005 (S.B. 1192) allows utilities and independent (non-utility) developers of renewable energy projects in the state to request financing from the Idaho Energy Resources Authority (IERA), a state bonding authority created in March 2005 by the Environment, Energy and Technology Energy Resources Authority Act (H.B. 106). The authority was created to finance the construction of electric generation and transmission projects by electric utilities. SB 1192 extended the financing opportunities to independent renewable energy producers that are not "qualifying facilities" under the federal Public Utility Regulatory Policies Act of 1978 (PURPA)

New Mexico's Energy Efficiency and Renewable Energy Bonding Act, which became law in April 2005, authorizes up to $20,000,000 in bonds to finance energy efficiency and renewable energy improvements in state government and school district buildings. At the request of a state agency or school district, the New Mexico Energy, Minerals and Natural Resources Department will conduct an energy assessment of a building to determine specific efficiency measures which will result in energy and cost savings. A state agency or school district may install or enter into contracts for the installation of energy efficiency measures on the building identified in