Add CO2 Signal as provider

[fershad]

ElectricityMaps offers a free API call CO2signal. The API provides access to the latest carbon intensity data (at a country level). Since it is free, having this integration would make Grid Intensity Go a viable option for developers to use in hackathons, demo projects, prototypes and the like.

The API requires an API key for access, and is rate limited to 30 requests per hour/1 per second.

API docs can be found at: https://docs.co2signal.com/

[rossf7]

Hey @fershad @mrchrisadams 👋 I took a look at adding CO2 Signal as a provider but you probably saw that ElectricityMaps announced a free tier last week?

https://www.electricitymaps.com/news/our-free-api-is-now-available-among-our-other-products

We can support this by making the Electricity Map API URL configurable via an env var.

Changes are here https://github.com/thegreenwebfoundation/grid-intensity-go/pull/71 and I also fixed a :bug: with setting the valid_from and valid_to dates.

I've been integrating with their API for another project so as AIUI there are 3 types of base URLs we need to support.

• New free tier https://api-access.electricitymaps.com/free-tier/
• Paid self service users including free trial users e.g. https://api-access.electricitymaps.com/2w97h07rvxvuaa1g/
• Larger users that don't use their API portal https://api.electricitymap.org/v3

Maybe we should also change the default URL to the free tier?

[mrchrisadams]

hi @rossf7 ! That makes a lot of sense - I think this is a good idea. I'll respond in #71 with any comments there.

[mrchrisadams]

We should also probably close this, or make a new issue for supporting the endpoints.

[rossf7]

Thanks Chris <3 closing in favour of #72