California building code requires rooftop solar for new homes

Starting in 2020, all new residential homes in California must be built solar ready. On May 7, the California Energy Commission approved the 2019 Building Energy CodeYou are leaving WAPA.gov. which includes that provision.

The California Energy Commission approved the 2019 Building Energy Code, which includes the provision that all new homes must be built solar ready, starting in 2020.

The California Energy Commission approved the 2019 Building Energy Code, which includes the provision that all new homes must be built solar ready, starting in 2020. (Photo by DOE Office of Energy Efficiency and Renewable Energy)

This historic revision of building energy codes is expected to drive a large investment in residential rooftop solar and energy efficiency as California pursues its goal of getting 50 percent of its energy from renewables by 2030You are leaving WAPA.gov.

In addition to mandating rooftop solar, the code contains incentives for energy storage and requires new home construction to include advanced energy-efficiency measures. Using 2017 data, ClearView Energy Partners You are leaving WAPA.gov. estimate that the mandate could require between 68 and 241 megawatts of annual distributed solar buildout.

Good for consumers, solar, storage industries
The commission stated that the new code is meant to save Californians a net $1.7 billion on energy bills all told, while advancing the state’s efforts to build-out renewable energy.

Following the commission’s decision, solar developers such as Sunrun, Vivint Solar and First Solar experienced a surge in stock prices, Bloomberg reportedYou are leaving WAPA.gov.

The updated codes also allow builders to install smaller solar systems if they integrate storage in a new home, adding another incentive to include energy storage. California has been a leader in incentivizing energy storage. In January, the California Public Utility Commission moved to allow multiple revenue streams for energy storage, such as spinning reserve services and frequency regulation.

Utilities question policy
The solar industry received a prior boost in January 2016, when the CPUC approved its net metering 2.0 rate design. The state’s investor-owned utilities asserted at the time that net metering distributed generation from electricity consumers shifted the costs for the system’s maintenance and infrastructure onto consumers who do not own distributed generation.

ClearView analysts pointed to the distributed solar mandate as a possible opening for utilities to argue that California regulators should reconsider the net metering reform proposal. According to the report ClearView published ahead of the CEC’s decision, utilities that opposed the new rate-design could claim that mandating distributed solar alters the policy landscape enough to warrant further review of the compensation levels paid to excess generation.

Source: Utility Dive, 5/9/18

Roseville Electric program takes home efficiency to next level

Even the most successful energy-efficiency program, like Roseville Electric Utility’s You are leaving WAPA.gov. high-performing BEST Homes partnership, needs a periodic renovation if it is to continue its success. To keep up with the changing times—and codes—the municipal utility recently unveiled its new Roseville Advanced Homes Program (RAHP).

Roseville Electric Utility's updated residential efficiency program is built around the principle that the best time to install high-efficiency features is in early construction.

Roseville Electric Utility’s updated residential efficiency program is built around the principle that the best time to install high-efficiency features is in early construction. (Photo by California Advanced Homes Program)

RAHP is the next step in market evolution that Roseville began with BEST Homes, explained Program Manager Mark Riffey. “When we launched BEST Homes, Roseville builders weren’t installing solar and energy efficiency was nothing more than doing what was required,” he recalled. “But [California Building Standard] code has caught up with the program and will pass it soon.”

Title 24 You are leaving WAPA.gov. now requires new homes to be solar ready to meet requirements, making incentives for solar unnecessary. By 2020, the code will require all new homes to meet the net-zero energy standard.  RAHP encourages builders to meet that requirement proactively, building efficiency into homes before they even think about solar.

Starting on right foot
The program aims to get builders involved well in advance of submitting plans to the city, said Riffey. “The earlier they enter the conversation, the better chance of success.”

Any residential builder planning a development in Roseville may participate in RAHP by signing a prerequisite agreement confirming that their homes will include:

  • 75-percent high-efficacy lighting
  • HERS verification of Quality Insulation Installation
  • Electric vehicle charging station pre-wiring

These measures were chosen to provide a solid energy-efficiency foundation and because they are easy and relatively inexpensive to install early in construction. “The time to make sure a house is insulated correctly or to put in a dedicated breaker and conduit for an electric vehicle charger is when you are in the design phase or early in construction,” Riffy pointed out. “You can add those things later, but it is much more expensive.”

Once the prerequisites are in place, builders can earn incentives up to $3,500 per house for adding bonus measures such as whole-house fans, high-performance attics and LED lighting. Roseville is considering adding battery storage and triple-pane windows to RAHP in the future to move homes closer to the net-zero energy goal.

The completed home, with its tight shell and efficient systems and equipment, is then ready for a solar array. The homeowner can size the photovoltaic system for a load that has been reduced up front by best construction practices. “RAHP leads builders down the path to be aware of the measures that will get them to the 2020 requirement of zero-energy homes,” explained Riffey.

Or, to put it another way, it is going to take an integrated approach to meet the ambitious clean energy goals California has set for itself.

Working together
That focus on integration may be one of the biggest changes Roseville has made in its updated residential construction program. Where BEST Homes was a local effort guided by local stakeholders, RAHP was designed with the help of a third-party administrator to align with Pacific Gas and Electric Company’s (PG&E) California Advanced Home Program You are leaving WAPA.gov. (CAHP).

TRC, an engineering and construction management consultant, has administered CAHP for PG&E since 2011. “It was the best use of our resources,” observed Riffey. “TRC has spent years working with Title 24, and they can tell us measures that get the most bang for our buck.”

Coordinating with PG&E made sense, as well, because many Roseville residents are PG&E natural gas customers. After all, a well-insulated home is going to cut both heating and cooling costs. “Builders need to turn in only one set of papers for both programs,” said Riffey. “Anything that streamlines the program for the builder/customer improves its chance for success.”

Roseville Electric Utilities aims to succeed. Over its ten-year run, BEST Homes succeeded beyond expectations. A very high percentage of homes recently built in Roseville are solar ready, and California has made that requirement part of its building code. If RAHP enjoys the same kind of success, Roseville’s housing stock may set a zero-energy example for the whole state.