California City Enacts Law Requiring Solar Energy Systems on Most New Homes

05 May 2013 Renewable Energy Outlook Blog

The city of Lancaster, California recently adopted an ordinance requiring builders of most new homes to install functional solar power generation systems on these homes prior to their sale to the public. The law is believed to be the first in the nation to actually mandate the installation of solar systems. Californians may recall that the California Environmental Protection Agency, in 2004, advocated the adoption of a home solar power mandate that would have required home builders to include solar power in at least 5% of new homes by 2010 (a figure that was proposed to increase to 50% by 2020). That proposal, which comprised a portion of the agency’s “Million Solar Homes” initiative, never came to fruition.

The Lancaster law, built into the zoning code, is effective with respect to all new home construction permits issued after January 1, 2014. To obtain a building permit, 1 kilowatt of installed solar generation capacity per home within a proposed subdivision is generally required. There is some flexibility built into the law in that it does not necessarily require solar systems to be installed on each and every home within a particular subdivision. For example, for a subdivision consisting of 10 homes, the requirement can be met by having 2 homes that each have 5 kilowatts of solar installed, or 4 homes that each have 2.5 kilowatts installed. Builders are also required to include solar energy systems on model homes that are reflective of the solar energy systems that will be offered to home buyers.

For those of us in the solar industry in California, it should come as no surprise that Lancaster is the first city to adapt such a law. Lancaster’s Mayor, Republican R. Rex Parris, is known as a champion of solar, and Lancaster is miles ahead of almost all cities in the country with respect to its support of solar power and its efforts to increase commercial and residential installation of solar power systems. In 2009, Lancaster worked with eSolar to streamline the permitting and construction process for the company’s Sierra SunTower project, a 5MW solar thermal project that was completed in just 14 months. In 2010, the city launched the Solar Lancaster program, a public-private partnership with SolarCity designed to provide affordable solar system financing for residential, commercial and nonprofit customers. That program resulted in the installation of solar systems on 19 different Lancaster School District sites, a Toyota dealership, a church, a minor league baseball stadium, and numerous other municipal buildings. Residential installations have also been proliferating, with one research group calculating that the city has tripled the number of residential installations in the past 18 months. Mayor Parris and the city have managed to cast an impressive global reach when it comes to sharing their vision of a solar powered world – Lancaster in 2012 won first prize in the “Fire” category of the Wolfgang Neumann Energy Globe World Awards in Vienna, Austria, and the Mayor was one of the keynote speakers at the 2012 World Future Energy Summit in Abu Dhabi, United Arab Emirates. 

I have had a few people ask me whether any legal challenges to the mandate are expected. Some home builders have expressed opposition to the law, which is not surprising given that it would seem likely to increase their costs (and hence, the cost they must charge to the public in selling the homes, thereby decreasing competitiveness with homes in the resale market that are not required to comply with the mandate). While a legal challenge is always a possibility, in my view such a challenge would face an uphill battle, as cities generally have wide discretion in establishing zoning rules and regulations. Opponents of the law may be waiting to see if more, larger cities (the Lancaster population is 158,000) adopt similar laws – if so, we might expect to hear more discussion regarding homebuilder industry opposition and possible legal challenges to such mandates.

This blog is made available by Foley & Lardner LLP (“Foley” or “the Firm”) for informational purposes only. It is not meant to convey the Firm’s legal position on behalf of any client, nor is it intended to convey specific legal advice. Any opinions expressed in this article do not necessarily reflect the views of Foley & Lardner LLP, its partners, or its clients. Accordingly, do not act upon this information without seeking counsel from a licensed attorney. This blog is not intended to create, and receipt of it does not constitute, an attorney-client relationship. Communicating with Foley through this website by email, blog post, or otherwise, does not create an attorney-client relationship for any legal matter. Therefore, any communication or material you transmit to Foley through this blog, whether by email, blog post or any other manner, will not be treated as confidential or proprietary. The information on this blog is published “AS IS” and is not guaranteed to be complete, accurate, and or up-to-date. Foley makes no representations or warranties of any kind, express or implied, as to the operation or content of the site. Foley expressly disclaims all other guarantees, warranties, conditions and representations of any kind, either express or implied, whether arising under any statute, law, commercial use or otherwise, including implied warranties of merchantability, fitness for a particular purpose, title and non-infringement. In no event shall Foley or any of its partners, officers, employees, agents or affiliates be liable, directly or indirectly, under any theory of law (contract, tort, negligence or otherwise), to you or anyone else, for any claims, losses or damages, direct, indirect special, incidental, punitive or consequential, resulting from or occasioned by the creation, use of or reliance on this site (including information and other content) or any third party websites or the information, resources or material accessed through any such websites. In some jurisdictions, the contents of this blog may be considered Attorney Advertising. If applicable, please note that prior results do not guarantee a similar outcome. Photographs are for dramatization purposes only and may include models. Likenesses do not necessarily imply current client, partnership or employee status.

Related Services


Foley Automotive Report
06 December 2022
Dashboard Insights
Episode 3: The Future Powered By Hyperscale Cloud Computing with David Sloan of Microsoft
06 December 2022
Innovative Technology Insights
2023 M&A Outlook
05 December 2022
Foley Ignite
COVID-related Form I-9 Remote Verification Flexibilities Extended Through July 31, 2023
05 December 2022
Labor & Employment Law Perspectives
What You Should Know About Payor/Provider Convergence
25-26 January 2023
Los Angeles, CA
ATA EDGE2022 Policy Conference | American Telemedicine Association
7-9 December 2022
Washington, D.C.
CLE Weeks
5-16 December 2022
Milwaukee, WI
Foley Sponsors Ernst & Young Entrepreneur of the Year® Program
1 December 2021 - 30 November 2022
Michigan and Northwest Ohio Region