diff --git a/lib/datasource/terraform-module/index.ts b/lib/datasource/terraform-module/index.ts
index ff8ccf9832da90..d096500a603a5c 100644
--- a/lib/datasource/terraform-module/index.ts
+++ b/lib/datasource/terraform-module/index.ts
@@ -50,6 +50,33 @@ export interface ServiceDiscoveryResult {
   'providers.v1'?: string;
 }
 
+export async function getTerraformServiceDiscoveryResult(
+  registryUrl: string
+): Promise<ServiceDiscoveryResult> {
+  const discoveryURL = `${registryUrl}/.well-known/terraform.json`;
+  const cacheNamespace = 'terraform-service-discovery';
+  const cachedResult = await packageCache.get<ServiceDiscoveryResult>(
+    cacheNamespace,
+    registryUrl
+  );
+  // istanbul ignore if
+  if (cachedResult) {
+    return cachedResult;
+  }
+  const serviceDiscovery = (
+    await http.getJson<ServiceDiscoveryResult>(discoveryURL)
+  ).body;
+
+  const cacheMinutes = 1440; // 24h
+  await packageCache.set(
+    cacheNamespace,
+    registryUrl,
+    serviceDiscovery,
+    cacheMinutes
+  );
+
+  return serviceDiscovery;
+}
 /**
  * terraform.getReleases
  *
@@ -80,12 +107,9 @@ export async function getReleases({
     return cachedResult;
   }
   try {
-    const serviceDiscovery = (
-      await http.getJson<ServiceDiscoveryResult>(
-        `${registryUrl}/.well-known/terraform.json`
-      )
-    ).body;
-
+    const serviceDiscovery = await getTerraformServiceDiscoveryResult(
+      registryUrl
+    );
     const pkgUrl = `${registry}${serviceDiscovery['modules.v1']}${repository}`;
     const res = (await http.getJson<TerraformRelease>(pkgUrl)).body;
     const returnedName = res.namespace + '/' + res.name + '/' + res.provider;
diff --git a/lib/datasource/terraform-provider/index.ts b/lib/datasource/terraform-provider/index.ts
index 5b5fba1390aea4..f97a3608482243 100644
--- a/lib/datasource/terraform-provider/index.ts
+++ b/lib/datasource/terraform-provider/index.ts
@@ -3,7 +3,7 @@ import { logger } from '../../logger';
 import * as packageCache from '../../util/cache/package';
 import { Http } from '../../util/http';
 import { GetReleasesConfig, ReleaseResult } from '../common';
-import { ServiceDiscoveryResult } from '../terraform-module';
+import { getTerraformServiceDiscoveryResult } from '../terraform-module';
 
 export const id = 'terraform-provider';
 export const defaultRegistryUrls = [
@@ -38,11 +38,9 @@ async function queryRegistry(
   registryURL: string,
   repository: string
 ): Promise<ReleaseResult> {
-  const serviceDiscovery = (
-    await http.getJson<ServiceDiscoveryResult>(
-      `${registryURL}/.well-known/terraform.json`
-    )
-  ).body;
+  const serviceDiscovery = await getTerraformServiceDiscoveryResult(
+    registryURL
+  );
   const backendURL = `${registryURL}${serviceDiscovery['providers.v1']}${repository}`;
   const res = (await http.getJson<TerraformProvider>(backendURL)).body;
   const dep: ReleaseResult = {