New regulations make solar more attractive. New regulations for distributed solar.

New rules encourage small solar systems

Red tape cut to simplify connecting to the national electricity grid

Earlier this year Mexico’s Energy Secretariat (Sener) presented new guidelines for the interconnection of small solar systems, known as distributed energy sources, to the national electricity grid.


The revised regulations are designed to boost rooftop installations by making it easier and more attractive for residential and commercial consumers to invest in solar energy. The new rules apply to solar systems with an installed generation capacity of less than 500 kilowatts (kW).

At the end of last year, Mexico reached 220 megawatts (MW) of distributed rooftop solar generation capacity based on figures from Sener. In 2016, it is estimated that 100 MW of distributed solar energy projects were installed.

This number is forecast to more than double in 2017 to 240 MW, which would put Mexico at 460 MW of distributed solar energy by the end of 2017. Growth in this market segment is due to a 25% increase last year in the price of electricity for high consumption domestic users and similar rate increases for commercial users.

This, combined with lower solar panel and component pricing, has reduced the average return on investment from five to four years.

The government hopes the new rules will help them reach their goal of 500,000 domestic rooftop solar systems interconnected to the grid, or 5% of all homes in Mexico. The government states this would save the country 5.9 billion pesos (US $314 million) in subsidized electricity generation costs that are currently provided to assist Mexican families with the high cost of electricity.

The new distributed solar regulations form a part of the federal government’s broader energy reform agenda and long-term goal to generate 25% of the country’s electricity from clean sources by 2018, 35% by 2024, and 50% by 2050!


The key changes to the interconnection rules are as follows:

Interconnection times cut down to 13 days:

• The manual simplifies the interconnection process, shortening the application processing time and installation of the two-way “smart” meter.

• The new regulations, signed into law, allow a maximum of 13 days to interconnect a solar system to the grid.

• A maximum of 18 days is permitted for more complicated interconnection applications.

The Federal Electricity Commission (CFE) will no longer review interconnection applications:

• Previously, the CFE was responsible for the review and approval of interconnection applications and installation of the two-way “smart” meter.

• Moving forward, the new independent grid operator, CENACE, will be in charge of the review process and meter installation.

• The change was made to remove a potential conflict of interest with the CFE’s new solar subsidiary company and remove uncertainty on how long it will take to interconnect solar systems to the grid.

Larger solar systems allowed:

• Residential customers are now allowed to interconnect solar systems up to 25 kilowatts of capacity (10 kW was the maximum capacity permitted before).

• Low voltage commercial customer’s interconnection limit was increased to 50 kW capacity (previously 25 kW).

• The simple interconnection process remains in place for solar systems up to a maximum capacity of 500 kW.

It should be noted that solar systems up to 50 kW are regulated under Mexico’s attractive net metering laws, which values excess solar generation at the high retail rates, whereas solar systems between 50 and 500 kW are required to enter into a net billing scheme, where excess electricity generation is sold into the wholesale power market at nodal pricing.

You can actually download an app on your smartphone to see the following day’s nodal prices in your region of the country.

To see if Mexico stays on track to meet the long-term clean energy targets, keep your eyes on an upcoming announcement by the Secretary of Energy set for April 28.  The government is expected to announce the start of its third renewable energy auction. The auction process is expected to be completed by mid-October, with winners announced shortly thereafter.

Project developers are eagerly awaiting the announcement as 2016 was a ground-breaking year for the Mexican renewable energy sector. Last year, 4,731 megawatts of lucrative long-term power purchase agreements were awarded (60% solar, 40% wind). These projects are expected to generate approximately US $6.1 billion of investment.

Jarrett Leinweber, M.Sc., is an entrepreneur, environmental and sustainable energy specialist. He provides consulting services and is a developer of solar energy and electrical infrastructure projects. He can be reached at

Stories from our archives that you might enjoy

  • frankania

    I have a 600 watt system here in Cordoba. I will try to contact CENACE to get the new meter!

    • MortimerSnerd

      Frank, at only 600 watts, assuming your grid-tied, and assuming average consumption of 5kw or 6kw a day, you would never be able to generate more than you use. Right now all you are doing is slowing down your grid consumption, and maybe keeping your self out of DAC rates. In order to roughly equal your co-generation capacity with your consumption, you would need 1500 to 2000 watts worth of panels… about 6 or 7 300 watt panels, and the appropriate inverter(s) would do it. There is no point in changing the meter if all you are generating is 600 watts.

      • frankania

        Mortimer, (the puppet?) I am not yet grid connected, and we use it only during power failures, and with a small refrig. But, here in Cordoba, at 3200 feet altitude,we almost never use A-C, so our electric bill is quite low anyway.

        • MortimerSnerd

          Yup… personify in Edgar Borgen’s smart-assed puppet the one and only MortimerSnerd. Brilliant ventriloquist full of razor sharp 1-liners. Fan of old tyme radio. OH… don’t bother unless you risk running into DAC at 350kwh. Your 600 watts worth of panels will probably keep you well under DAC unless you run AC a lot, which doesn’t seem the case.. your climate is probably dry too…not like Merida in the summer, hot n humid. It’s different for me, live on the west coast, winters are dry and cool, summers are warm n humid too..

          • frankania

            MORT, What is DAC? We also built a small house in La Penita, Nayarit on the west coast, but only use it in the non-summers because of the HEAT! I am a compulsive builder, and cannot stop with my projects, though approaching 77 years…

          • MortimerSnerd

            …frankania…. look at your CFE bill, any conusmption above 350kwh for 4 months or more, two bills in a row (this is not gospel but is as I understand it) and you will lose your “aportacion gubermential” subsidy for the ENTIRE BILL, meaning you will pay the full ‘costo de produccion’ rate for 1 year which will be 3X or 4X as much as you pay now… and that’s for a year. That’s why it’s called the ‘dreaded DAC’. That 600 watts you generate comes off the ‘top’ or reduces your agregate grid consumption, possibly by as much as 25% to 50% and would go a long way in reducing any CFE bill to well below DAC rates. Always remember anything you generate comes off the top of your consumption. La Penita… Guayabitos.. spent 2 winters there before moving down to Melaque…Now have a large house in the area.

          • frankania

            thanks for the info, Mort. Melaque is not far from our place in La penita so let’s keep in touch and we will invite you to lunch on our upper deck, which has a sea-view from the ocean 1000m away. frankania at yahoo

  • Mexico, onward and upward!

  • Karl Crabkiller

    Any idea when the new solar regulations go into practice ?