Green travel guide

Solar Power in Costa Rica: Rooftops, Batteries, Hot Water and the Rules

Costa Rica's grid is already almost entirely renewable, with ICE reporting that clean sources met 97.3% of domestic demand in 2025, so rooftop solar here is mostly about cutting bills, handling outages and powering remote sites. Since Law 10086, new grid-tied systems no longer get the old one-for-one net metering, and the regulator's tariff rules were still being reworked in 2026. Get a design from a registered engineer and read your own distributor's current requirements before you buy.

By Pura-Verde.com Editors · Published October 30, 2026 · Last checked October 30, 2026

Best for: homeowners, farms, lodges and businesses weighing rooftop solar, solar hot water or backup batteries in Costa Rica.
Grid in 2025: ICE reported 98.6% renewable generation including exports, and 97.3% of domestic demand met with clean sources.
The law: Law 10086 on distributed energy resources, in force since December 2021, with regulations in Decree 43879-MINAE (2022).
Good to know: CNFL says the old 'simple net metering' contracts can no longer be signed; new contracts treat all exported energy as surplus.
Ask before you buy: what happens to this system in a blackout, and who comes out when it stops producing?

Costa Rica already makes nearly all its electricity from water, wind and volcanic heat. So why are so many roofs here sprouting solar panels? The answer usually has less to do with the national grid than with one building's bills, its hot showers and what happens when the power goes out.

A solar system can be an environmental step, a financial investment, a backup plan or all three. It can also be badly sized, oversold or hard to service once the installer has moved on. This guide explains how the grid actually works, what changed in Costa Rica's rules for people who generate their own power, and how to compare installers without getting dazzled by a "payback in three years" slide. It isn't engineering or legal advice. For a real decision you'll want a registered engineer and your own distributor's current paperwork.

Why add solar to a grid that's already almost all renewable?

The national numbers are impressive. According to ICE's system-operations division, as reported by Delfino.cr in February 2026, clean sources met 97.3% of domestic electricity demand in 2025. Hydro supplied about 73.6%, wind 11.9% and geothermal 11%. Solar was still a sliver, under half a percent of demand. ICE's headline figure of 98.6% renewable generation includes power exported to the rest of Central America.

But 2024 showed the limits. That year, with El Niño drying out the reservoirs, the clean share of demand fell to 86.8% and thermal plants ran hard. In May 2024 ICE even activated an alert for scheduled power cuts. It cancelled the alert on May 17 after the rains returned, wind picked up and electricity was imported from Guatemala and El Salvador. Dry years still happen: Pura Green News has covered communities rationing water in 2026 as El Niño conditions set in.

So the case for rooftop solar in Costa Rica rests on a few practical questions:

Bills: Does the property use a lot of power during sunny hours, like a hotel running air conditioning or a farm pumping water?
Resilience: Would an outage hurt, for example at a lodge with refrigeration, a well pump or online bookings?
Distance: Is the site far from the grid, where a line extension would be costly or slow?
Hot water: Is a big share of the bill going to electric showers and water heaters?

If none of those apply, using less energy may beat adding panels.

Three technologies, often sold under one word

Solar photovoltaic (PV) panels turn sunlight into electricity. Solar thermal collectors heat water directly. Battery storage holds energy for later or keeps essentials running when the grid fails, if the system is designed for it. They overlap, but they solve different problems.

An off-grid home needs generation, storage, controls and a backup plan that works through cloudy weeks and equipment faults. A grid-tied home can use PV to offset part of its consumption while the grid covers the rest. A lodge might find that solar hot water pays back first, while a small battery protects the pumps, radios and booking system.

Solar hot water: the quiet workhorse

Solar water heating is older, simpler and often overlooked. Termisolar, a Costa Rican company, says it has been building and installing solar water heaters since 1990 for homes, businesses, industry and pools, and that it runs its own factory, which it says helps with spare parts and repairs.

One of Costa Rica's best-known solar companies also started with hot water. A 2017 Amelia Rueda report describes how Enertiva, founded by four young professionals, found its first niche during the global financial crisis: solar water heaters for dairies in Costa Rica's cold highlands. The first was in Las Nubes de Coronado, on a dairy owned by the mother of one of the founders, and it helped show that solar could pay off well away from the sunny beaches.

That's a lesson worth keeping. Start with a real load. Hot water for milking equipment, a hotel laundry or a dozen guest showers is a concrete problem a good installer can measure.

Enertiva and Alejandro Brenes: from a dairy to the region

In March 2017, Alejandro Brenes, described as Enertiva's co-founder and CEO, was named one of the World Economic Forum's Young Global Leaders. That's a dated recognition, not a statement of his title today. Enertiva's own site says the company has taken part in more than 170 MW of projects in the region since 2007 and lists offices in seven countries, including one in Barrio Escalante, San José. Those are the company's own figures.

The bigger point is the path: a home-grown company that began with a family dairy and a measured need, then grew into commercial and industrial solar. When you talk to any installer, ask what problem their first job solved, and what they learned from the jobs that went wrong.

Costa Rica's self-generation rules aren't the old net-metering story

This is where many online calculators and sales pitches go out of date. Costa Rica's Law 10086, on distributed energy resources from renewable sources, has been in force since December 2021. It lets homes and businesses generate and store their own power, charge vehicles and sell surplus to their distributor. Its regulations are in Decree 43879-MINAE (2022), and the regulator, ARESEP, sets the related tariffs.

The CNFL's page on distributed energy resources, which covers its own service area in and around San José, explains a key change:

Under the older simple net metering arrangement, energy sent to the grid was "deposited" and could be "withdrawn" later. CNFL says these contracts can no longer be signed.
Under the newer complete net metering, all energy sent to the grid counts as surplus, paid at a set purchase rate if the customer signs the right addendum and meets the requirements. CNFL says unused credits carry forward for up to 12 months.
Some customers pay an access charge and a per-kilowatt charge for distributed resources, depending on their tariff type, and interconnection involves an engineering study, inspection and commissioning.

The rules were still moving in 2026. In June 2026, Costa Rica's constitutional court gave ARESEP two months to issue the tariffs and regulatory framework that Law 10086 had required by 2022 and 2023, after a complaint from solar entrepreneurs. Check what ARESEP has published since, and what your own distributor (ICE, CNFL, a municipal utility or a rural cooperative) requires now. The distributor, not a generic calculator, decides how your connection is processed.

The practical takeaway: don't accept a claim that every kilowatt-hour you export will be swapped one-for-one for a kilowatt-hour you buy back later. Ask the installer to show the current rules for your distributor and your meter type, in writing.

Batteries and blackouts: what panels can and can't do

Here's the surprise for many buyers: most ordinary grid-tied systems shut down during a blackout, by design, so they don't feed power into lines that crews are repairing. Panels on the roof don't guarantee the fridge keeps running.

Backup power needs the right inverter, protection equipment and usually batteries. Batteries add cost, age over time and need a cool, ventilated, safe place to live. For many homes the sensible design is a small battery that covers essentials (lights, internet, a pump, a fridge) rather than the whole house. Ask the installer to list exactly which circuits will stay on, and for how long.

Coast, rain and rural service

Costa Rica is hard on equipment. Salt air corrodes frames and connectors near the beach. Heavy rain and wind test roof fixings. Lightning is common. And a remote site may be hours from the nearest technician.

Ask about:

corrosion-rated mounting and hardware for coastal sites;
how the panels attach to your roof, and whether the roof structure was checked;
lightning and surge protection;
the manufacturer's warranties and the installer's own workmanship guarantee;
how long a replacement inverter would take to arrive.

Power lines matter for wildlife too. Pura Green News has reported on Costa Rica's plan to reduce monkey and sloth electrocutions. If your project involves new overhead wiring on a forested property, ask about insulated cable and wildlife-safe design.

Finding installers with a real address

Look for companies with a verifiable office, a track record you can check and engineers or electricians who'll sign the design. A few established names:

Heliotek Solar lists an office in San Rafael de Montes de Oca, San José, and offers grid-tied, hybrid and off-grid systems, battery storage, solar lighting and remote monitoring.
Termisolar focuses on solar water heaters and pool heating.
Enertiva works mainly on commercial and larger projects across Central America.

These are examples, not endorsements. Ask any installer for references you can phone, the name of the engineer responsible and proof of professional registration. Our Pura-Verde directory lists green businesses as we verify them.

How to compare two solar quotes

1. Give every bidder the same problem. Share 12 months of electricity bills, roof photos and dimensions, and your goals for backup power. Then quotes can actually be compared.

2. Ask for a component list. Exact panel, inverter and battery models; expected lifetimes; manufacturer warranties; assumed system losses; and the safety protections included.

3. Ask for a transparent financial model. It should show the tariff, how much solar power you'll use yourself, what exported surplus is worth under current rules, cleaning, maintenance, inverter replacement and battery aging. If the assumptions aren't visible, the payback number means little.

4. Ask about outages. Will anything run in a blackout? Which circuits?

5. Ask who monitors it. Who gets the alert when production drops? Who drives to a rural site? Are warranty parts shipped from overseas? Who trains your staff?

Red flags

A panel count offered before anyone has looked at your bills.
Promises that you'll "never pay for electricity again."
Net-metering claims that don't mention Law 10086 or your distributor's current rules.
No named engineer or electrician responsible for the design.
Vague answers about warranties, service visits or spare parts.

Using less first

The cheapest kilowatt-hour is the one you don't need. Shade, cross-ventilation, efficient fridges and pumps, LED lighting and solar hot water can shrink the system you need before you buy a single panel. Our green building guide covers tropical design that keeps buildings cool without much power, and lodges that take energy seriously show up in our sustainable hotels guide. If you're planning a whole off-grid property, the ecovillages guide and our guide to rainwater harvesting and water-smart living are good companions, and climate resilience projects show how communities are preparing for dry years.

Costa Rica's clean grid is a real national achievement. The next step happens building by building, with systems that local people can understand, maintain and repair.

Frequently asked questions

Is solar worth it in Costa Rica if the grid is already renewable?

It can be, but for different reasons than elsewhere. ICE reports that clean sources met 97.3% of domestic demand in 2025, so the main benefits are lower bills for properties with heavy daytime use, backup during outages and power for remote sites. Solar hot water is often the quickest win.

Does Costa Rica still have net metering?

Not in the old form for new customers. Under Law 10086, CNFL says the old "simple net metering" contracts can no longer be signed, and new contracts treat exported energy as surplus paid at a set rate. ARESEP's tariff rules were still being revised in 2026, so check your distributor's current terms.

What law governs rooftop solar in Costa Rica?

Law 10086 on distributed energy resources from renewable sources, in force since December 2021, with regulations in Decree 43879-MINAE. ARESEP sets the related tariffs, and each distributor handles connections in its own area.

Will my solar panels work during a power outage?

Most standard grid-tied systems switch off in a blackout for safety. To keep power on, you need a system designed for backup, usually with batteries and the right inverter. Ask your installer which circuits will stay on.

Do I need permission to connect solar panels to the grid?

Yes. Grid-connected systems go through your distributor's interconnection process, which CNFL describes as an application with an engineering study, then inspection and commissioning. Off-grid systems still need safe electrical design by qualified professionals.

Are solar water heaters common in Costa Rica?

Yes. Local manufacturers such as Termisolar have made them since 1990, and companies like Enertiva began with solar water heaters for highland dairies. They're well suited to homes, hotels, farms and pools.

Sources

We checked these pages when we last updated this guide. We didn't interview the people named; their roles and words come from the sources above.

More green travel guides

Guide